Patent Application
20170196255
The present disclosure generally relates to food products, ingredients for food products and methods of manufacture of such products, particularly but not exclusively for food products which are frozen for storage before use and which are suitable for reheating or cooking from a frozen state using a microwave oven. Preferred products are in addition or alternatively suitable for reheating or cooking in a combination microwave-thermal oven, air fryer oven or in a thermal oven. The products may also be reheated or cooked by grilling or shallow or deep frying.
Many food materials, for example, natural muscle of poultry, fish or red meat or vegetable or processed foods contain a large percentage of water. Most fresh foods contain more than 60% water. Some of this water is bound, that is tightly attached to the constituent cells. The remaining mobile water is available and can be frozen. If a food product is frozen to a core temperature of between −1° C. and −30° C. or lower and is irradiated in a microwave oven, the microwave energy will be primarily absorbed by the frozen available water. Whereas in conventional cooking heat is applied from the exterior, in microwave cooking, heat is generated from within. The process of heating can be very rapid so that available water is converted into steam. When a food product is allowed to stand after heating in a microwave or other oven, water can continue to be expelled from the product. This is particularly noticeable for example when heating frozen fish muscle. The loss of water causes any food coating, particularly a batter, pastry or breadcrumb coating to become soggy and unpalatable. In addition the core of the substrate may become dry due to loss of water. A further problem arises due to accumulation of ice crystals on the exterior of a food product as it is frozen. Migration of water on storage or during thawing can detract from the crispness of the underlying coating.
Attempts have been made to regulate the escape of moisture during microwave heating by coating the product with a composition which forms an impermeable film. This is unsatisfactory because the natural distribution of water within the coated product is lost through the coating as steam due to internal pressure. Furthermore an impenetrable coating or film can be detrimental to the taste and texture of the product.
According to an aspect of the present disclosure includes a method of manufacture of a microwave or thermally reheatable or cookable food product that includes the steps of: providing a solid or solidified substrate; and applying two or more coating compositions to the substrate to produce a coated substrate. At least one of the coating compositions includes or is only ethylcellulose. At least one of the coating compositions that is applied to the substrate may contain at least 50 wt % particulate farinaceous component, preferably a crumb.
Another aspect of the present disclosure is generally directed to a method for production of the above product that may include the successive steps of: applying a first aqueous coating to the substrate; applying an inner coating layer comprising ethylcellulose, a particulate farinaceous component and, optionally, one or more further edible ingredients to form an ethylcellulose coated core; applying a second aqueous coating to the ethylcellulose coated core; and applying a coating particulate farinaceous component to form a breaded product. The method may additionally comprise the steps of frying the coated substrate and freezing the fried coated substrate. The method may additionally comprise the step of coating the substrate with a coating combination comprising ethylcellulose and a glyceride, wherein the coating composition is solid or semi-solid at a temperature between 0° C. and 35° C.
Before subject matter of this application is described further, it is to be understood that the disclosure and the claimed invention is not limited to the particular embodiment described below, as variations of the particular embodiments may be made and still fall within the scope of the appended claims. It is also to be understood that the terminology employed is for the purpose of describing the particular embodiments, and is not intended to be limiting. Instead, the scope of the presently claimed invention will be established by the appended claims.
Where a range of values is provided, it is understood that each intervening value, to the tenth of the unit of the lower limit unless the context clearly dictates otherwise, between the upper and lower limit of that range, and any other stated or intervening value in that stated range, is encompassed within the scope of the disclosure or claimed invention. The upper and lower limits of these smaller ranges may independently be included in the smaller ranges, and are also encompassed within the disclosure, subject to any specifically excluded limit in the stated range. Where the stated range includes one or both of the limits, ranges excluding either or both of those included limits are also included in the invention.
In this specification and the claims, the singular forms “a,” “an,” and “the” include the plural reference unless the context clearly dictates otherwise. Ethylcellulose is a polymeric material derived from the naturally occurring polymer cellulose. Ethylcellulose polymers are inert, have no caloric value and are virtually colourless, odourless and tasteless. Ethylcellulose polymers, for example manufactured under the trade mark ETHOCEL™ (trade mark of The Dow Chemical Company) are used for pharmaceutical applications but use in food products has been limited. The ethylcellulose may have a particle size in the range of from about 30 μm to about 150 μm or from 30 μm to 15 μm, more typically 30 μm to 60 μm. A small particle size may be advantageous.
Ethylcellulose softens and becomes plastic at temperatures between 135° C. to 160° C., dependent on the ethoxyl content. Ethylcellulose forms excellent films which are flexible even at low temperatures and therefore forms an excellent water barrier. Ethylcellulose has been used as a flavour fixative in encapsulation and as a vitamin tablet coating.
The ethylcellulose may be used as a pure ingredient. Alternatively, additives may be employed to modify the surface properties of the ethylcellulose. For example, sorbitan monostearate or other surfactant may be added, particularly to reduce loss of oil from composites in which oil is present.
The method finds particular application in manufacture of fried coated products, microwaveable food products or thermally cookable or reheatable chilled products and ingredients or components for such products. The method may be used for manufacture of coated farinaceous substrates, for example multi-layer food products and snack foods.
The method also finds application in manufacture of food products which are frozen or chilled for storage, for example for extending the storage life of frozen chilled products. These products may be reheated using a conventional or microwave oven.
Use of a coating of ethylcellulose may prevent moisture migration during storage of a frozen food product or ingredient or component of such a product. For example, moisture migration from the core of a frozen coated product may be reduced. In addition the storage life of a cool-line product may be prolonged as less water is able to migrate to the outer crumb layer causing sogginess of the crumb in the outer layer.
Products, ingredients or components manufactured in accordance with this invention have the advantage that their taste and texture properties may be improved in comparison to food products not including an ethylcellulose coating or intermediate layer, particularly after frozen storage and reheating or cooking, especially using a microwave oven, combined microwave and thermal oven or an air fryer. The products may also exhibit superior properties when used in chilled applications for products which are stored or displayed at ambient temperatures.
According to the present disclosure a fried coated food product includes a core of edible material and inner and outer coating layers that surround the core of edible material. At least one of the coating layers contains ethylcellulose.
The inner coating layer may comprise a farinaceous component including from 5 wt % to 20 wt %; 6 wt % to 16 wt %; more preferably 9 wt % to 12 wt % ethylcellulose.
The fried coated food product may contain one or more farinaceous coating layers containing a particulate farinaceous component, at least one of said farinaceous coating layers covering the ethylcellulose containing coating layer.
The fried coated food product may further include: a core of edible material; a first binding layer; an inner coating layer having ethylcellulose, a particulate farinaceous component and, optionally, one or more edible ingredients applied to the substrate to form an ethylcellulose coated core; a second binding layer; and a coating crumb layer. The fried food product may be obtained by the methods disclosed.
According to the present disclosure a food product includes: a baked farinaceous substrate; a covering or a filling having a water activity of more than 0.8; and a boundary layer separating the substrate from the covering or the filling, said boundary layer containing ethylcellulose, wherein the boundary layer is a layer that contains at least 50 wt % fat and at least 3 wt % ethylcellulose.
Improved properties may include one or more of crispness, crunchiness, hardness and brittleness. These properties contribute to the texture and mouth-feel of a successful product.
A further advantageous property is that uptake of fats or oils during frying may be reduced, resulting in a food product with a lower fat content. For example, escape of moisture may be reduced, providing less of an opportunity for ingress of oil or fat. Also, the ethylcellulose coating layer may prevent or impede passage of frying oil into the core of the product, especially at lower cooking temperatures.
In a particularly advantageous method, a plurality of layers, preferably two layers, are applied successively to the substrate. The two layers may be the same or may have different compositions. Preferably, the first layer consists essentially of, i.e. does not contain materials that materially affect the basic characteristics of the ethylcellulose in the first layer, or comprises ethylcellulose. The second layer may comprise ethylcellulose with one or more additives as described below.
In a further advantageous embodiment a coated food product includes a substrate and a plurality of layers applied successively to the substrate, one of the layers includes ethylcellulose.
The product may be a fried product which may be frozen after frying for storage and reheating or cooking in a microwave or thermal oven prior to consumption.
The location of an ethylcellulose containing layer within a multi-layered coated product may be used to control the properties of the product, particularly the extent of interaction of the ethylcellulose with oil penetrating during frying or other heating of the exterior of the product. A method of control of the moisture resisting properties of a food product may include the step of controlling one or more of the porosity, hydrophilicity, absorbency of one or more ingredients of the outer coating layer or layers. The particle size of an outer crumb layer may be controlled to provide larger or smaller inter-particular spaces. An infill of finer crumb may be applied to reduce the size of the spaces. An intermediate layer may include a gelling agent selected to thicken or solidify upon contact with frying oil.
The optimum location of the ethylcellulose-containing layer may be determined by simple experiments.
The ethylcellulose-containing coating composition may further include calcium phosphate.
The coating composition containing ethylcellulose may be applied as a boundary layer between a baked farinaceous substrate and a covering or a filling having a water activity of more than 0.8.
For a fried product one or more outer layers may be applied onto the ethylcellulose containing layer. This serves to create a barrier to prevent or reduce release of the ethylcellulose into the frying oil. A build-up of ethylcellulose in frying oil is undesirable and may reduce the working life of the oil.
The outer layers may comprise a flour-containing batter or a non-flour containing aqueous coating layer and a coating crumb layer applied to the batter or aqueous coating layer.
In an embodiment, the method includes the steps of: providing a substrate core; applying a first aqueous coating to the substrate; applying an inner coating layer comprising ethylcellulose, a particulate farinaceous component and, optionally, one or more further edible ingredients to form an ethylcellulose coated core; applying a second aqueous coating to the ethylcellulose coated core; applying a coating crumb to the core to form a breaded product; frying the breaded product in heated oil to form a fried product and freezing the fried product. The farinaceous component may include a bonding crumb layer, including crumbs having a small particle size, for example less than 2 mm as disclosed below.
A breaded product which may be fried in heated oil to form a fried product may include: a substrate core; a first aqueous coating applied to the substrate core; an inner coating layer comprising ethylcellulose, a particulate farinaceous component and, optionally, one or more further ingredients; a second aqueous coating applied to the inner coating layer; a coating crumb applied to the second aqueous coating to form a breaded product; wherein the breaded produce may be fried in heated oil and frozen. The frozen product may be heated or cooked in a microwave, thermal or combination microwave and thermal oven. An air fryer may be employed.
Without wishing to be bound by theory, it is believed that the composition comprising ethylcellulose and a particulate farinaceous material such as comminuted crumb or crumb fines may form a relatively hydrophobic layer containing relatively hydrophilic apertures to facilitate passage of water during reheating in a conventional thermal oven or a microwave oven. The layer may also impede moisture migration on storage in a freezer for example over a period of six weeks or longer.
The location of the ethylcellulose coating layer may be selected so that it is sufficiently remote from the outer surface of the product so that the frying oil does not significantly pick up the ethylcellulose as mentioned above. Also, the layer is preferably located sufficiently close to the surface that it reaches a temperature sufficient to liquefy the ethylcellulose without overheating the core or so that the outer coating layers are damaged by prolonged exposure to the frying oil. The weight and thicknesses of the layers may be determined in accordance with the particular application. The desired degree of heating of the core depends on the nature of the substrate and is easily determined by a person skilled in the art. For example, the substrate may be wholly or partially frozen, such as when manufacturing a coated fish product or a sauce filled product. Chicken or other meat products may lose moisture or their protein may be denatured if overheated during frying.
Percentages and other quantities referred to in this specification and claims are by weight unless stated otherwise and are selected from any ranges quoted to total 100%.
The farinaceous component may be a finely divided crumb having a particle size less than about 1.5 mm, more preferably less than about 1.0 mm, typically less than 0.8 mm. Fine dust is preferably absent from the farinaceous component. The presence of fine dust may be disadvantageous as it can lead to blockage of moisture absorbent sites on the underlying substrate preventing adhesion of a coating. In addition, a dust layer can act as an absorbent and may act as a sponge, promoting undesirable migration of liquid between a dough or pastry substrate and a filling. The crumb is preferably an extruded dough which has been coextruded with a hydrocolloid, preferably a natural gum, for example guar gum, manufactured in accordance with the disclosure of WO2010/001101, which is incorporated herein by reference in its entirety for all purposes.
A further ingredient may comprise a glyceride, preferably a saturated or unsaturated triglyceride, more preferably vegetable oil in an amount 1 wt % to 15 wt %. A vegetable oil or fat which is solid at ambient temperature may be employed. The vegetable oil is preferably added to the farinaceous coating material in order to prevent demixing or separation of the components during manufacture.
The presence of a glyceride may facilitate liquefaction of the ethylcellulose to form a gel-like ethylcellulose containing composite which serves as a moisture barrier in the finished product. The use of such a component avoids the need for the ethylcellulose to contact frying oil during manufacture.
In an alternative or additional embodiment, ethylcellulose may be included as a powder in the second aqueous coating. This is particularly suitable when the outer crumb layer includes two or more crumb layers or a larger crumb followed by an infill or smaller crumb product, so that the outer crumb layer provides a barrier to penetration of frying oil.
The second aqueous coating may not be a batter and may contain less than 10 wt %, preferably less than 5 wt %, of flour, more preferably no flour. The first aqueous coating may not be a batter and may contain less than 10 wt %, preferably less than 5 wt %, of flour, more preferably no flour. The ethylcellulose coating may comprise a thin homogeneous or continuous film extending over the surface of the coated substrate. Alternatively, the coating may comprise an intermittent film sufficient to impede moisture absorption by the substrate.
A further aspect includes, a method of manufacture of a microwave or thermally cookable or reheatable food product that includes the steps of: providing a substrate; and applying successive coating layers to the substrate, where the coating layers successively includes, in a direction from the substrate outwardly towards the surface of the coated product; a first aqueous composition; an inner particulate coating comprising ethylcellulose, a powdered farinaceous material and, optionally, a glyceride; a second aqueous composition; and an outer crumb layer of coating crumb to form a breaded product. The method further includes the steps of frying the breaded product in heated oil to form a fried product; and freezing the fried product. The method preferably includes the step of allowing the frying oil to penetrate the outer crumb coating layer during frying and contact the inner particulate coating layer. During frying water may escape from the substrate through the inner and outer coatings including the ethylcellulose/glyceride containing layer and pass into the frying oil. After removal from the fryer and cooling, the ethylcellulose/glyceride layer may solidify to form a solid or semi-solid barrier.
In a further preferred aspect of the present disclosure, the method includes the steps of: providing a food substrate; applying a first solid phase component comprising ethylcellulose and optional further ingredients to the substrate; applying a second component that includes a glyceride to the substrate, where the first and second components are in contact or in adjacent spaced relation; heating the components to a temperature greater than about 130° C.; allowing the second component to mix with the first component to form a liquid coating layer comprising ethylcellulose and glyceride; and allowing the coating layer to cool and form a solid or semi-solid composition.
The glyceride is preferably selected from glycerides which are solid or semi-solid at ambient temperature, for example palm fat.
The second component may be a solid phase component and may be mixed with the first solid phase component or provided separately as an adjacent coating layer, preferably outside the first solid phase component.
Provision of a second glyceride containing component adjacent the first solid phase component is particularly advantageous for products which are cooked or reheated in an air fryer or an oven. In contrast, products which are deep fried may use the frying oil to combine with the ethylcellulose to form a barrier layer.
Preferably the coating layer forms a complete coating on the substrate. Alternatively, the coating may have a density which is sufficiently low that the coating is incomplete, allowing escape of moisture through the coating during heating of the food product.
The first solid phase coating may further include a carrier. The carrier may include one or more ingredients of a food coating or part thereof. For example, a further ingredient may comprise a crumb or pre-dust layer applied to a substrate. The crumb or pre-dust layer may form a shell encasing the substrate. Alternatively, the carrier may include ingredients of a pastry or other farinaceous coating or base layer.
An advantage of the use of the method of the present invention is that the ethylcellulose contained in or comprising the first component is miscible when heated with the glyceride contained in or comprising the second component.
The ethylcellulose/glyceride mixture may form a solid, semi-solid or gel-like hydrophobic phase when allowed to cool. The hydrophobic phase may form a water resistant barrier which completely or partially prevents passage of moisture from the substrate into the outer coating layer of the food product. In this way the substrate remains succulent and the coating may remain crisp following reheating in a microwave oven.
The glyceride may be a food compatible oil, for example a saturated or unsaturated triglyceride, preferably a vegetable oil. Examples include peanut, olive, flax, palm, corn, canola or sunflower oils or mixtures thereof.
An amount of about 2 wt % to about 30 wt % of ethylcellulose may be combined with glyceride, preferably about 6 wt % to about 18 wt %, more preferably about 15 wt %.
The temperature to which the components are heated may be in the range of about 130° C. to about 160° C. Higher temperatures may be used but there is a risk of discolouring the ethylcellulose. Any convenient temperature can be employed to solubilize the ethylcellulose in the glyceride to form a thermoplastic mixture. Preferably the temperature is high enough to solubilise the components within a period of up to 2 minutes, 30 seconds as used for pre-frying microwaveable products.
Two or more coatings may be applied using the method disclosed above. Preferably two solid phase coatings may be employed.
A first solid phase coating may comprise ethylcellulose and glyceride. The first solid phase coating is preferably allowed to form an unbroken coating upon the substrate, for example for a pastry product.
The primary aqueous coating liquid may contain at least 0.05 wt %, preferably from 0.1-1 wt % of cellulose ether. The cellulose ether is preferably methyl cellulose. The primary aqueous coating liquid may contain at least 0.03 wt %, preferably from 0.05-1 wt % egg protein. The primary aqueous coating liquid may contain at least 0.05 wt %, preferably from 0.01-1 wt % of a gum selected from xanthan gum, guar gum, locust bean gum, carrageenan gum and combinations thereof. Use of xanthan gum is especially preferred. The primary aqueous coating liquid may contain at least 0.1 wt %, preferably from 0.15-2 wt % of modified starch. The primary aqueous coating liquid may contain from 0.5-19 wt % of a dispersed oil phase. The primary aqueous coating liquid may contain at least 80 wt % water.
The secondary aqueous coating liquid may contain at least 0.05 wt %, preferably 0.1-1 wt % cellulose ether, preferably methyl cellulose. The secondary aqueous coating liquid may contain at least 0.03 wt %, preferably 0.05-1 wt % egg protein. The secondary aqueous coating liquid may contain at least 0.05 wt %, preferably 0.01-1 wt % of a gum selected from xanthan gum, guar gum, locust bean gum, carrageenan gum and combinations thereof. Use of xanthan gum is especially preferred. The secondary aqueous coating liquid may contain at least 0.1 wt %, preferably 0.15-2 wt % of modified starch. The secondary aqueous coating liquid may contain 0.5-19 wt % of a dispersed oil phase. The secondary aqueous coating liquid may contain at least 80 wt % water.
One or both of the primary and secondary aqueous coatings may be flour-free formulations, that is they may independently not contain any flour.
Preferably both the inner bonding crumb and the outer coating crumb include a milled farinaceous dough extrudate containing about 0.05 wt % to about 5 wt % of added hydrocolloid.
The term “added hydrocolloid” as used herein refers to hydrophilic polymers that are not naturally present in the farinaceous component of a dough extrudate and that are capable of increasing the viscosity of an aqueous medium to which they have been added. These hydrophilic polymers are suitably selected from naturally occurring gums.
The term “aqueous coating” refers to a coating which is applied in the form of an aqueous coating composition before frying. The coating is usually no longer aqueous after immersion in the frying oil.
Food products in accordance with this invention typically have an advantage that the fried coating may have a weight which forms a smaller proportion of the total weight and which may be thinner than a similar product having a batter coating layer. The coating may be crisper and may not exhibit the dough-like taste of a battered product.
An advantage of products in accordance with this invention is that they may avoid a need for a relatively heavy and dough-like tasting outer coating, such as when a flour containing batter is used.
Food products having a coating in accordance with this invention typically have a further advantage that the coating layer has high integrity and strength, reducing or preventing any tendency of a fluid filling or substrate such as a sauce to bleed through the coating during reheating, whether in a microwave oven or other oven or when served for consumption.
Furthermore, oil absorption may be reduced resulting in a lower fat content of the fried product.
The uptake of the first or second aqueous coating liquids may be about 10 wt % to about 20 wt %, more typically about 15 wt % relative to the weight of the substrate.
In a preferred embodiment the fried coating that envelops the core of the edible material has a weight equal to about 5 wt % to about 85 wt % of the food product, said coating comprising at least four coating layers, successively including from the inside to the outside of the fried coating: a primary aqueous coating, a bonding crumb layer, a secondary aqueous coating and a coating crumb layer, preferably both the bonding crumb layer and the outer crumb layer contain at least 80 wt % of a hydrocolloid containing milled farinaceous dough extrudate containing about 0.05 wt % to about 5 wt % of added hydrocolloid.
The first aqueous coating may comprise the following dry ingredients mixed with water:
Preferably the first aqueous coating comprises, by dry weight:
A particularly advantageous first aqueous coating composition comprises, by dry weight:
The dry ingredients listed above may be dissolved in water to produce a viscous or gel-like solution. Typically, the solution may contain from 0.7% to 1.2%, preferably about 1%, by weight of the dry ingredients.
The balance of the coating composition may be water, although vegetable oil, for example, in an amount of 5 wt % may be included and may be used as a heat transfer medium, allowing the coating to be heated to a higher temperature during frying.
A moisture controlling salt may be added to one or both of the aqueous coating compositions. The salt may comprise a microwave absorbing, reflecting or scattering salt selected so that the temperature of an adjacent coating or other foodstuff is increased upon irradiation with microwave energy. The salt may include an edible inorganic salt. An amount of about 1 wt % to about 5 wt % may be added to the aqueous coating composition where the aqueous composition contains a total of about 0.1 wt % to about 2.0 wt %, typically about 0.9 wt %, of the above mentioned ingredients dissolved in water. Preferably the aqueous coating composition includes about 3 wt % of the moisture controlling salt.
The moisture controlling salt in the aqueous coating liquid may provide various functions.
In a first embodiment the salt serves to reduce or prevent migration of moisture from the substrate to one or more of the coating layers, particularly the outer layer of the coating crumb, during preparation of the product, intermediate storage and handling of the product during subsequent manufacturing steps, during freezing or upon storage in a freezer, chilled or at ambient temperature before reheating and serving.
In a second embodiment the metal salt may alternatively or in additional serve as a microwave susceptor, so that the aqueous coating liquid containing the salt becomes heated at an increased rate upon exposure to microwave radiation, As a result, the water contained in the aqueous coating liquid is evaporated at an increased rate. Condensation of water vapour is reduced. Passing out water from the core is reduced. This results in a microwave heated product with an improved crunchy coating in combination with a succulent moist core.
The moisture controlling salt is preferably an edible inorganic salt. A salt of calcium, magnesium, iron, zinc or copper may be used. Iron, calcium or magnesium salt may be used. For example iron (III) phosphate or iron (III) sulphate is particularly suitable. Alternatively, a calcium salt, for example calcium phosphate, carbonate or sulphate may be employed. A mixture of salts may be used. Various microwave absorbing salts are described in WO2014/111402, the entire contents of which are incorporated by reference.
Various phosphates of these metals may be used, for example orthophosphates, pyrophosphates, polyphosphates or higher condensed phosphates. Alternatively carbonates, hydroxides or carboxylates such as citrates or gluconates may be employed.
The moisture controlling salt may be an iron salt, particularly iron (III) phosphate in an amount of about 1 wt % to about 5 wt %, preferably about 1 wt % to about 3 wt % of the weight of the aqueous coating.
Use of an iron salt as a moisture controlling salt in the primary coating may yield an overall crisper coated product.
The primary and secondary aqueous coating solution may be applied to the substrate pieces using tempura dippers. An air knife or other air blower may be provided for removing any excess liquid from the coated substrate pieces.
Application of a coating of bonding crumb is facilitated by the use of the primary aqueous coating liquid since the crumb particles may not adhere sufficiently to a dry substrate. The application of the primary aqueous coat additionally offers the advantage that it may reduce loss of moisture and uptake of oil by the substrate during frying due to stabilising properties of the aqueous composition. Use of a conventional flour or breadcrumb based predust in place of the aqueous composition would not cause the crumb to adhere sufficiently to the substrate and would confer absorbent properties rather than moisture resistance which is desired to be achieved by the present invention.
The aqueous primary or secondary coating liquids may have a minimum viscosity of 300 cP, measured using a Brookfield viscometer with a number 3 spindle at 60 rpm at 10° C. The viscosity may lie within the range of 350-450 cP, alternatively in the range of 380-420 cP.
The farinaceous component or bonding crumb composition may comprise a crumb formed from a dough which has been co-extruded with a gum, as disclosed in WO 2010/001101, the entire disclosure of which is incorporated herein by reference for all purposes.
The farinaceous component or bonding crumb may have a dimension less than 0.8 mm.
The farinaceous component or bonding crumb may be provided as a component of a bonding crumb composition which comprises the extruded crumb together with a polyglucose component and optional further ingredients. A preferred polyglucose component is maltodextrin, although a mixture of maltodextrin and polydextrose may be used. An amount of about 1 wt % to about 15 wt %, of polyglucose component, preferably about 7 wt % to about 13 wt.%, more preferably about 10 wt.% may be employed. The bonding crumb composition may comprise about 70 wt % to about 90 wt %, preferably about 75 wt % to about 85 wt %, typically 81 wt % of the extruded crumb by dry weight.
The farinaceous component or bonding crumb composition may further comprise a secondary moisture controlling salt. The salts disclosed above may be employed. Use of calcium phosphate may be used. An amount of the moisture controlling salt of about 1 wt % to about 10 wt %, for example about 4 wt % to 8 wt %, for example about 6 wt % may be used.
The first aqueous coating composition may further comprise a pH adjuster, for example sodium carbonate. A typical amount may be about 2 wt %. The pH of the composition may be adjusted to be between pH4 and pH 7, typically about pH 5.
The farinaceous component or bonding crumb composition may further include an oleophilic carrier mixed with the crumb particles, for example an edible oil, preferably a vegetable oil in an amount of about 1 wt % to about 5 wt %, preferably about 2 wt %.
The weight of the farinaceous component or bonding crumb composition may be 5-15 wt %, preferably 6-10 wt %, for example about 8 wt % relative to the weight of the substrate.
The farinaceous component or bonding crumb composition may be applied to the substrate as particles or as a powder using a conventional crumb applicator so that the composition, when applied, forms a complete shell covering the entire surface of the substrate.
The secondary aqueous coating may comprise an aqueous mixture of water and the following ingredients by dry weight:
The ingredients may be combined in water to provide a solution containing about 0.7 wt % to about 1.2 wt %, preferably about 1.0 wt %, of solids in an aqueous solution.
The secondary aqueous coating may include:
An advantageous secondary coating composition includes
In preferred formulations and products disclosed in this specification neither the first aqueous coating nor the second aqueous coating is a batter and both should contain less than 10 wt %, preferably less than 5 wt %, of flour. Flour is most preferably not present in the aqueous coating. Flour products which we excluded may be any powder made by grinding raw grains or roots, including gluten containing and gluten free flours such as cereal flour, such as wheat flour, maize flour, rice flour, rye flour, sorghum flour or the like. A flour containing batter may create a barrier preventing efficient heating and liquefaction of an underlying ethylcellulose layer and may also detract from the texture and overall taste of the product.
Vegetable oil in an amount of about 1 wt % to about 10 wt %, preferably about 5 wt %, may be added to the coating solution.
A secondary microwave susceptor may be added to the secondary coating composition. An amount of about 2 wt % to about 10 wt %, preferably about 6 wt %, may be employed. The secondary susceptor may be selected from the susceptor compounds disclosed above. Preferably the secondary susceptor is a calcium salt, especially calcium phosphate.
The pickup of the secondary coating composition may be from about 8 wt % to about 16 wt %, typically about 12 wt % of the weight of the bonding crumb coated portion. Any excess of the aqueous coating composition may be removed using an air knife or other blower.
One or more layers of outer crumb may be applied to the secondary coating.
In preferred embodiments, the formulations consist essentially of the ingredients recited, in the sense that any additional ingredients are not present in a sufficient amount to affect the essential properties and characteristics of the product. In further embodiments the products consist only of the recited ingredients.
Use of a process in accordance with this invention confers several advantages particularly in comparison to conventional battered and crumbed products. The breaded crust may be lighter and thinner than for a battered product. For example, the weight of the crumb may be from about 10% to about 20%, typically about 15%, of the weight of a flour-containing batter coating. The reduced amount of crust results in a reduced amount of starch providing a less starchy taste, allowing the flavour and texture of the crumb and substrate to be more readily appreciated by a consumer.
The fried coating on each side of the present food product may have an average thickness of 1 to 8 mm, alternatively of 1.5 to 5 mm, or 1.8 to 4 mm.
Embodiments of this invention provide a microwaveable frozen product, that is a product which has been cooked before freezing and which can be reheated in a microwave or combination microwave/thermal oven to give a satisfactory product with a succulent core and crisp crumb coating. Products of this invention may be also reheated using a conventional thermal oven.
The core of cooked edible material preferably has a weight equal to from about 50 wt % to about 95wt.% and the fried coating has a weight equal to from about 5 wt % to about 50 wt % of the total weight of the food product.
The benefits of the present invention are particularly evident in embodiments in which the core of edible material contains an appreciable amount of water. During microwave reheating in particular, some of the water contained in the core of the product will turn into steam. Although we do not wish to be bound by theory, it is believed that the fried coating of the present product is permeable to the steam that is generated within the core of the product, but it hardly absorbs any of the steam, thus retaining its crisp nature. Typically the core of edible material contains at least 15 wt %, more preferably at least 25 wt %, and most preferably at least 30 wt % water. The water content of the core material normally does not exceed 90 wt %.
The coated food product of the present disclosure is suitably prepared by frying the product for a sufficiently long time to ensure that the edible material that makes up the core is fully cooked. The fried product may be further cooked in an oven if necessary, for example for large or bulky products to achieve a fully cooked product. Thus, the product can simply be reheated in a microwave without the need for further heating for a sufficiently long period as may be necessary to completely cook it. The product may withstand such a prolonged period of frying without detriment. In contrast, conventional coated products may be damaged by prolonged frying.
The use of a hydrocolloid-containing milled dough extrudate in both the farinaceous component of the bonding crumb and in the coating crumb coating may provide a further advantage that, together with the aqueous coating layers, these crumb coatings form a shell which may act as a barrier to penetration of oil into the core of the portion during the prolonged period of frying. Thus, the two crumb layers made of the aforementioned milled dough extrudate produce a fully cooked fried product having a relatively low fat content. Surprisingly and unexpectedly, this lower fat content has virtually no adverse effect on the eating quality of the coated food product that is obtained by the present method. Typically, the fried coating of the coated food product has a fat content that is substantially lower, for example at least 10% lower, than that of a coated food product that is identical except for the fact that it was prepared using ordinary crumb. Preferably, the coating has a fat content of less than 20 wt %, more preferably a fat content of about 2 wt % to about 15 wt %, and most preferably of about 4 wt % to about 12 wt %. Here the term fat refers to lipids selected from; triglycerides, diglycerides, monoglycerides, free fatty acids, phospholipids and mixtures thereof.
The coating of the present food product possesses unique properties. Not only does this coating absorb little fat during frying, but it also may absorb a reduced amount of water. Furthermore, the fried coating may be very stable in the presence of humidity. This special quality explains why steam that is produced during microwave reheating of the edible core can escape from the product without causing the fried coating to become unacceptably soggy. Thus, the fried coating of the present food product typically has a water content of not more than 10 wt %, more preferably of not more than 5 wt %, after microwave reheating. Here the water content refers to the water content after microwave reheating to a core temperature of 80° C.
The milled extrudate that is contained in the inner crumb layer typically has a mass weighted average particle size of less than 2 mm. The milled extrudate in the inner crumb layer may have a mass weighted average particle size of less than 1.8 mm, for example 0.1 to 1.5 mm, 0.15 to 1 mm, for example 0.25 to 0.9 mm.
Typically, the inner farinaceous component or crumb layer has a weight of 1-20% of the weight of the fried product. For example the inner farinaceous component or crumb layer may represent about 2 wt % to about 10 wt % alternatively about 3 wt % to about 8 wt % of the fried product.
The particle size distribution of the crumb and the milled extrudate can suitably be determined by use of a set of sieves of different mesh sizes in a manner well-known to a person skilled in the art.
The milled extrudate that is employed in the inner crumb layer may contain not more than a minor amount of particles having particle size in excess of 1.5 mm. For example not more than 5 wt % of the milled extrudate comprised in the inner crumb layer may have a particle size of more than 1.5 mm, or more than 1.2 mm.
The milled extrudate that is contained in the coating crumb layer preferably has a mass weighted average particle size of 0.5 to 3 mm, for example 1 to 3 mm.
The farinaceous component and outer coating crumb layers of the frozen, microwaveable product may contain minor amounts of other farinaceous material besides the milled farinaceous dough extrudate. An inner farinaceous layer preferably contains at least 80 wt %, most preferably at least 90 wt % of the milled farinaceous dough extrudate. Likewise, the outer crumb layer may contain at least 80 wt %, most preferably at least 90 wt %, of the milled farinaceous dough extrudate. In preferred embodiments no other crumb materials are present in order to maximize the moisture resistance of the coating.
Typically, the outer coating crumb layer has a weight equal to from about 3 wt % to about 25 wt % of the weight of the fried product. Even more preferably, the coating crumb layer has a weight of from about 5 wt % to about 15 wt %, most preferably of from about 8 wt % to about 12 wt % of the fried product, said percentages being dependent on the shape and dimensions of the product.
The milled extrudate that is employed in the coating crumb layer preferably contains not more than a small amount of fines. Typically, not more than 5 wt % of the milled extrudate in the outer crumb layer has a particle size less than 0.5 mm, preferably less than 0.8 mm. The absence of fines or dust allows complete coating of the substrate surface with crumb of the desired particle sizes. The presence of fines or dust may prevent or reduce adhesion of the desired crumb onto the substrate by coating the surface thereof.
Microwaveable products of particularly good quality can be obtained by employing a relatively fine milled extrudate in the farinaceous component layer and a relatively coarse milled extrudate in the outer coating layer. Accordingly, in an especially preferred embodiment of the present food product, the milled extrudate that is contained in the coating crumb layer has a mass weighted average particle size that is at least 50% higher, more preferably at least 100% higher and most preferably 200% to 500% higher than the mass weighted average particle size of the milled extrudate that is contained in the bonding crumb layer.
The hydrocolloid used in the milled extrudate may be any hydrocolloid which forms a gel or otherwise increases viscosity when mixed with water. Preferred hydrocolloids produce a milled extrudate which retains shape when stirred in water having a temperature of 20° C. for a period of 60 seconds. Use of a hydrocolloid may provide a degree of water resistance to the milled extrudate reducing any tendency to pick up moisture. Typically, hydrocolloid is contained in the milled extrudate in a concentration of from about 0.06 wt % to about 4 wt %, more preferably from about 0.08 wt % to about 3 wt % and most preferably from about 0.1 wt % to about 3 wt %.
Examples of hydrocolloids that may be used in the farinaceous dough extrudate of the inner and outer crumb layers include: natural gums, modified gums, pectin, alginate, arabinogalactan, agar, carrageenan, furcellaran, xanthan and combinations thereof. Preferably, the hydrocolloid is selected from natural gums and combinations thereof. Use of gelatin or starch is not preferred as these do not impart moisture resistance to the product.
Examples of natural gums that may suitably be employed as a hydrocolloid in the milled farinaceous dough extrudate include; guar gum, xanthan gum, locust bean gum, gum Arabic, tragacanth, gum karaya, gum ghatti, xanthan gum and combinations thereof.
Most preferably, the hydrocolloid is selected from: guar gum, locust bean gum, xanthan gum and combinations thereof.
Advantageously, the milled extrudates employed in the farinaceous component or bonding crumb and in the coating crumb may have the same composition.
The farinaceous component or bonding crumb, where present, and coating crumb are preferably dried to a low water content before use, for example below 2 wt %, alternatively below 1.5 wt %, further alternatively below 1.3 wt %. A suitable drying process is disclosed in EP-B-2606745, the entire disclosure of which is incorporated into this specification by reference for all purposes.
The edible material contained in the core of the coated food product suitably comprises fish, meat, poultry, shellfish, shrimps, dairy products (e.g. cheese), ragu, vegetable, fungi and combinations thereof. According to a particularly preferred embodiment animal material selected from fish, meat, poultry, shellfish, shrimps and combinations thereof represents at least 40 wt %, even more preferably at least 60 wt % and most preferably at least 80 wt % of the core of edible material.
The portions of solid substrate may contain at least 30 wt %, preferably at least 50 wt %, of animal tissue.
The core of edible material may have a thickness not greater 50 mm, preferably of not more than 15 mm, more preferably of not greater than 10 mm. This conveniently allows sufficient penetration of microwave radiation within a period of 2 to 3 minutes using the power available in a typical domestic microwave oven.
The portions of solid or solidified substrate that are coated with the aqueous precoating liquid may be solid at ambient temperature or, alternatively, they may be liquid or paste-like at ambient temperature. In the latter case, that is if the substrate is not solid at ambient temperature, the substrate is cooled to a sufficiently low temperature to render it solid, before applying the precoating liquid.
The present method may suitably be used to produce coated food products from portions of solid substrate have a weight in the range 5-300 g. The portions of solid substrate may have a weight in the range of 10 to 50 g.
The portions of the substrate may be whole portions, for example whole muscle portions such as individual steaks or fillets or larger pieces which may be cut into individual portions after cooking or reheating. Alternatively the pieces may comprise chopped or comminuted pieces, for example, nuggets or minced products which may be pressed or otherwise reconstituted into larger portions. Use of pieces with uniformly sized and weighted cores is preferred.
The solid or solidified substrate may be extruded using a die to form individual portions delivered, for example, on a wire mesh conveyor. The temperature of the extruded portions may be in the range of from −6 to 6° C. preferably of from −4 to −1° C. to stiffen the substrate to facilitate handling during the subsequent processing steps.
The substrate, especially if it is composed of chopped or comminuted pieces, is preferably impregnated with an aqueous or particulate stabilizer composition, for example by soaking, permeation or injection (for example vacuum pulse injection) into the substrate prior to forming into portions. Examples of suitable stabilizer compositions can be found in WO 97/03572, the disclosure of which is incorporated herein by reference for all purposes. The substrate may be impregnated with the stabilizer composition to the extent that the ingredients are distributed throughout the substrate or impregnate the bulk of the substrate structure. Impregnation may be achieved by soaking, permeation or injection into the substrate prior to forming into portions.
The present method may suitably employ a crumb coating apparatus that includes a first endless conveyor and a second endless conveyor located below the downstream end of the first conveyor, and beneath a flow of fine crumb particles so that portions fall from the first conveyor onto a layer of particles on the second conveyor. The second conveyor may pass through a curtain of fine crumb falling onto the conveyor surface so that the portion falls onto the crumb causing the crumb to adhere to the surface layer of the aqueous precoating, and is then coated by the falling curtain of crumb particles. The apparatus may include a dispenser having an outlet extending across of the conveyor to provide the curtain of fine crumb extending across the path of the portions on the conveyor. A roller may be located above the conveyor on the exit side to bear on the coated portion to improve adhesion of the fine crumb.
Crumb may be applied in excess to the portion using a crumb applicator, for example, a Crumb Master (a trademark of GEA). The crumb coated portion may be passed through a roller to improve adhesion.
The total amount of aqueous precoating liquid, batter and crumb that is applied onto the portion in the present method is preferably such that, after frying, the fried portion has a weight that exceeds the weight of the uncoated portion of solid substrate by 25-100%, preferably by 30-60%.
The breaded portion may be fried to cook the substrate and coating layers. The period of cooking is preferably sufficient to completely cook the substrate preventing any health risk in the event that a frozen product is insufficiently reheated from the frozen state in a microwave oven. A comparatively long period of reheating in a microwave oven is undesirable since the substrate is heated from the inside by the microwave energy resulting in a loss of moisture. This may lead to a dry core and damage to the coating layers.
A homogeneous outer crumb coating, with none of the underlying batter layer being exposed is advantageous to provide a uniformly browned appearance after a prolonged period of frying. This may be compared to a product obtained after a shorter period of frying as commonly used for conventionally thermally cooked breaded products.
The bonding crumb that is bound by the aqueous precoating may form a stabilising thermal barrier underlying the secondary coating layer and the second coating of crumb may provide a barrier to escape of moisture and ingress of oil during a prolonged frying stage. The coating layers may also serve to protect the surface of the substrate from excessive local heating during frying.
For conventional thermally cooked breaded products such as chicken nuggets, a short period of frying, for example 90 seconds or less, has been followed by a further period of cooking in a hot air oven. This is disadvantageous for microwave cookable products because the core of the substrate may not be thoroughly cooked during reheating from the frozen state. Prolonged heating of conventional products in a microwave oven leads to excessive loss of moisture and consequent damage to the coating layers.
During the frying step the breaded portion, optionally after having been coated with one or more additional crumb layers, is preferably contacted with the hot oil for from 120-300 seconds, more preferably for from 130-240 seconds, most preferably for from 140-180 seconds. A typical frying time is 150 seconds.
The hot oil that is used for frying the breaded portion preferably has a temperature of 160-200° C., for example 170-195° C. and typically 180-185° C.
The oil employed may be a vegetable oil. The term “vegetable oil” encompasses non-modified vegetable oils, hydrogenated vegetable oils, fractions of vegetable oils (for example olein or stearin fractions), inter-esterified vegetable oils and combinations thereof.
The core temperature of the fried portion after frying may be greater than 72° C., for example greater than 74° C.
Frying in accordance with this invention is advantageous in comparison to flash frying followed by hot air cooking as the latter may not give a coating with desired hardness without moisture loss from the core. However, a hot air oven such as an oven belt cooker, may be used to further cook larger products in cases where the frying time is insufficient to fully cook the products, for example for bone-in products or whole muscle products such as chicken breast fillets.
The breaded portion is suitably fried by immersing the breaded portion in the hot oil, for example by passing it through a bath of hot oil by means of a conveyor belt. The frying apparatus preferably comprises a double layer of parallel endless belts both layers passing beneath the oil surface, a portion carried on the lower layer being prevented from floating during frying by contact with the upper layer. The belts may include wire screens or other perforated configurations.
It has been found that in order to produce a frozen coated food product that, although it comprises a moist core, can be heated in a microwave or combination oven to yield a ready-to-eat hot product with a crunchy coating, the freezing conditions employed in the process are important. More specifically, it has been found that the core temperature of the fried coated portion should be reduced very quickly after frying, that is it is inserted quickly into the freezer when the core temperature of the fried portion is still high. Although we do not wish to be bound by theory, it is believed that rapid freezing of the fried portion wherein the dwell time between frying and introduction into the freezer is short enhances the structural integrity of the product, reduces formation of ice crystals and reduces the size of any ice particles which may be formed within the products. If ice crystals are present in a battered breaded product they can become superheated in a microwave oven creating hot spots in the core. Also, migration of ice crystals on storage can lead to a build-up of localized ice, which on heating can result in release of excessive moisture near to the surface coating.
This may be contrasted with conventional processes wherein fried products are allowed to cool before introduction into a freezer. The fried portions are preferably introduced into the freezer after a period of less than 10 minutes, for example less than 5 minutes after removal from the freezer, as disclosed in U.S. Pat. No. 9,326,536, the entire disclosure of which is incorporated herein by reference for all purposes.
In a particularly preferred embodiment of the present method, the fried coated portion that is produced by frying of the breaded portion has a core temperature in excess of 70° C. and is frozen by introducing said fried portion into a freezer before the core temperature of the fried coated portion has fallen to a temperature of 50° C., and the core temperature is reduced in the freezer to less than −15° C., using cryogenic freezing.
In accordance with a particularly preferred embodiment, the fried coated portion has a core temperature of more than 65° C., preferably of more than 70° C., when it is introduced into the freezer.
The cryogenic freezing of the fried coated portion in the present method suitably comprises contacting said fried portion with a liquid gas, more preferably a cryogen, especially liquid nitrogen.
According to a particularly preferred embodiment, the fried portion has a core temperature of at least 50° C., more preferably of at least 60° C., even more preferably of at least 65° C. and most preferably of at least 70° C. when it is contacted with the liquid gas.
Preferably, the fried portion is contacted with a liquid gas until the core temperature of the portion is less than −15° C., more preferably less than −20° C. and most preferably less than −22° C.
The core temperature of the fried coated portion may not decrease by more than 25° C., alternatively not more than 20° C. and for example by not more than 15° C. before the fried portion is placed in the freezer, or before it is contacted with liquid gas.
The frozen products may be suitably packaged for storage and distribution. Packaging under an inert atmosphere, for example nitrogen, is preferred.
The frozen product may be reheated or cooked from the frozen state before use using an oven selected from: a microwave oven, a conventional oven or grill, deep or shallow fried, or an oven using a combination of microwave and conventional heating.
A method of manufacture of a food product may include the step of coating a substrate with a coating composition including ethylcellulose and a glyceride, where the coating composition is solid or semi-solid at ambient temperature. The coating composition may be employed in the previously disclosed methods.
Preferably the glyceride is a saturated or unsaturated triglyceride, particularly a vegetable oil. The vegetable oil is preferably solid at ambient temperature, for example palm fat.
Exemplary compositions include;
An exemplary composition includes;
The coating may be created by spraying a substrate with vegetable oil which has been heated as necessary to form a sprayable liquid, adding ethylcellulose, optionally heating and allowing to cool. While this process may be used for many products, this process may be disadvantageous for products in which the liquid composition can flow downwardly due to gravity. This may result in poor coverage of the sides of a product such as a pastry base.
The coating may be applied to a substrate by heating an ethylcellulose-glyceride composition above a melting or softening temperature, followed by application of the melted composition by brushing or spraying.
Alternatively, when the ethylcellulose-glyceride composition is solid at ambient or working temperature, the solid composition may be comminuted and applied as particles, for example as a powder or dust. This may provide better coverage of the sides of a product.
The composition may be cooled or frozen to facilitate milling into a powder. Alternatively, the composition may be melted and cast into a film, cooled and broken into flakes or other particles. After warming to ambient or an elevated operating temperature, the flakes may be softened to make them more adherent to the food substrate.
In a particularly advantageous embodiment, the composition may be applied as a covering upon an outer surface of a food product to prevent or impede migration of moisture in chilled or frozen conditions.
According to a further aspect of the present disclosure, a surface protection layer for a chilled or frozen food product includes ethylcellulose and optionally further includes other edible ingredients. The surface protection layer may include a combination of ethylcellulose and a glyceride, which is solid or semi-solid at a storage or display temperature of the product.
The surface protecting layer may prevent migration of moisture from the interior to the exterior of a fried or cooked food product upon storage in cold conditions or when frozen. This serves to protect the surface from formation of a surface layer of ice or condensed water. Use of the coating composition may serve to reduce the cooking or reheating time of the product in a conventional thermal oven, a microwave oven, an air fryer or a combination of thermal and microwave oven.
According to a further aspect, a thermal or microwave cookable or reheatable food product comprises a substrate coated with a coating includes ethylcellulose and optional further ingredients.
The coating may comprise ethylcellulose and a glyceride as described above.
The disclosure and claimed invention is further described by means of example, but not in any limitative sense.
A stabilizer composition was prepared using the following ingredients:
The composition was dissolved in water to produce a solution with a concentration suitable to stabilize the particular substrate in use. To this end the dry powder mixture was partially hydrated in a tub and then poured into a bowl chopper. The bowl chopper was then run for two to three minutes until the mixture was fully hydrated. The mixture can be hydrated directly in the bowl chopper if required. Alternatively, the stabilizer may be hydrated using a high shear mixer fitted with a general purpose head.
A chicken mixture for chicken dippers or nuggets was prepared with the following composition which was prepared as a dry mixture, as an alternative to use of a hydrated stabilizer composition. The stabilizer of Example 1 was used.
The chicken breast was chilled to −3° C. and minced using a 10 mm plate. After mincing, the temperature was 0-3° C. Water was added with mixing. A chicken emulsion that included the following ingredients was added with mixing:
The stabilizer in accordance to Example 1was added and mixed thoroughly. Rusk was added with mixing following by seasoning. A dry powder flavoring was preferred. The composition was allowed to dissolve in use in water, which was present in the substrate, in order to form an aqueous stabilizer solution in situ.
A vacuum was applied to the mixture to consolidate the structure following which the chicken mixture was chilled to -3° C. and formed into shaped pieces.
A similar procedure was used for other comminuted meat products. Large particulate cores may be manufactured using a similar method.
(a) The following mixture was prepared:
The mixture was dissolved in water to form a 1% solution using a CFS Scanbrine mixer with paddle agitation. The solution was left to stand for a period of 1 hour to 24 hours to form a fully hydrated gel or viscous solution.
A pump is necessary to run the machine but after a short while bubbles may form in the gel solution in the applicator. To prevent this problem food grade anti foaming agents can be used. Polydimethylsiloxane is preferred but calcium alginate, methyl ethyl cellulose, methyl phenyl polysiloxane or polyethylene glycol can be used.
(b) The solution of Example 3(a) may be used directly. Alternatively, ingredients were combined as follows:
(a) A secondary coating composition was prepared by mixing the following ingredients:
The mixture was dissolved in water to form a solution containing 1% of the listed dry ingredients.
(b) A secondary coating liquid was prepared by mixing the following ingredients:
In a pre-processing stage, pieces of chicken or other substrate are cut to an appropriate size or comminuted as required. The substrate pieces are impregnated with a stabilizer composition, as described in Example 2. A forming machine was used to form the product. A conventional forming machine may be arranged to extrude chicken substrate pieces having a predetermined thickness and one or more shapes. The pieces are extruded onto a conveyor arranged to carry them to a tempura dipper containing a primary aqueous coating liquid as described in Example 3(a) to form a pre-coated product.
The tempura dipper includes a reservoir for the primary aqueous coating composition or pre-gel. A first lower conveyor carries pieces beneath the surface of the aqueous composition. A second upper conveyor prevents the pieces from floating. This ensures complete coating of the pieces. The upper and lower conveyors are disposed in parallel spaced relation to form a channel within which the pieces are located during coating.
A second lower conveyor carries the substrate pieces out of the reservoir beneath the upper conveyor. The substrate pieces emerging from the reservoir pass under an air jet to remove excess liquid.
Following application of the primary aqueous coating a coating of crumb fines is applied using a crumb applicator. The crumb fines were made by milling crumb manufactured in accordance with the disclosure of WO 2011/001101, which is hereby incorporated by reference in its entirety.
The fine crumb coated substrates are then passed through a tempura applicator to apply a secondary aqueous coating followed by application of the outer crumb. The substrate pieces which have been coated with primary aqueous coating and crumb fines are passed through a bath of the secondary aqueous coating using a wire mesh conveyor, so that complete immersion of the pieces is achieved.
A first layer of heavy grist coating crumb may be applied to the secondary coated product followed by a lighter grist crumb to infill between the heavy crumb particles. Alternatively, a single outer crumb layer may be employed, particularly when using a large sized outer crumb. The crumb was made in accordance with the disclosure of WO2011/001101.
Following application of the first and second crumb layers the coated substrates were placed in a fryer.
Heated oil contained in an elongate reservoir was heated to a constant temperature of 180 to 188° C. Pure rapeseed oil was employed.
Parallel upper and lower conveyors were used to prevent the substrate pieces from floating during passage through the fryer.
The fried products when removed from the heated oil had an external temperature of about 180° C. and a core temperature of about 90° C. The products were transferred by the conveyor into a cryogenic freezer during a period of not less than 2 minutes.
The transfer from the fryer to the freezer is arranged so that the core temperature of the product was reduced from 75° C. to −30° C. during a period not longer than 15 minutes.
The frozen products were packaged in hermetically sealed packages. The packaging may be flushed with nitrogen dependent on the required shelf life of the product.
The procedure of Example 6 was repeated with 16 wt % of the crumb replaced with ethylcellulose. The resultant product had a crisper coating than the comparative example in which the ethylcellulose was omitted.
Example 6 was repeated with 9% of the water in the secondary aqueous coating liquid of Example 4 replaced with ethylcellulose. The expert tasting panel found that the product with addition of ethylcellulose had a crisper coating than the comparative product of Example 8 in which the ethylcellulose was omitted.
The frozen products were packaged in hermetically sealed packages. The packing may be flushed with nitrogen although this may not be used dependent on the required shelf life of the packaged products.
Example 8 was repeated except that 16% of the crumb was replaced with ethylcellulose. After frying the ethylcellulose was found to have partially dissolved in the frying oil and formed a solid deposit in the oil on cooling.
However the products with the addition of ethylcellulose were found to be crisper than those in which ethylcellulose was not used.
Example 8 was repeated except that 9% of the water in the secondary coating liquid of Example 3(a) was replaced with ethylcellulose. It was found that some of the ethylcellulose had passed into solution with the penetrating frying oil and increased the viscosity of the oil on cooling. The effect was less than when using a dry application because the functionality had leeched out to the frying oil.
Products with the addition of ethylcellulose were crisper than those without.
Palm oil (700 g) was heated to 160° C. and ethyl cellulose (300 g Ethocel Premium 100 FP) was added with stirring over a period of 10 secs. Stirring was continued for 3 min until the ethylcellulose had completely dissolved to give a clear liquid.
A portion of the solution (100 g) was poured onto a cold plate and allowed to stand in a refrigerator at 0° C. for 30 min. The composition formed a solid sheet which was broken into flakes with a dimension of 1-3 mm. On warming to ambient temperature the flakes remained solid but became sticky when warmed to 100° C. On warming to 110° C. the flakes became liquid. The product was a colorless rubbery solid which was insoluble in water.
The procedure was repeated using the following mixtures:
On cooling to room temperature the composition was a clear gel.
On cooling to room temperature a clear solid composition was formed.
On cooling to room temperature a clear solid composition was formed.
On cooling to room temperature a clear solid composition was formed.
The procedure of Example 11 was repeated using the following vegetable oils in place of palm oil: sunflower oil, peanut oil, flax seed oil, olive oil, corn oil and canola oil.
The resultant compositions had similar properties to those obtained in Example 11.
A baked warm pastry base of 10 cm was placed on a tray. A composition comprising 15% ethylcellulose and 85% palm oil obtained using the method of Example 1 was applied using a sieve. The base was heated for 2 min 30 secs at 180° C. in an oven. The product was left to cool to room temperature before adding a quiche filling (50 g) comprising a creamy chicken filling with fresh onions and peas topped off with grated cheese. The product was stored for 15 days at 4° C. The product was heated in an oven for 12 mins at 180° C. The resultant product using the composition of Example 11 gave a base which was crisp and hard.
The procedure of Example 13 was repeated without addition of the ethylcellulose/oil composition.
A baked warm pastry base (10 cm) was placed on a tray. The base was heated for 2.30 minutes at 180° in an oven. The product was left to cool to room temperature before adding 50 grams of quiche filling having a creamy chicken filling with fresh onions and peas topped off with grated cheese. The product was stored for 15 days at 4° C. The product was heated in an oven for 12 minutes at 180° C. The base of the product was soggy and chewy.
A warm baked pastry base (10 cm) was placed on a grid and sprayed with palm oil (9 g) using a domestic sprayer. Finely powdered ethylcellulose (3 g) was applied using a sieve. The base was then heated for 8 mins at 180° C. in an oven. The base was allowed to cool and the creamy chicken filling of Example 13 was added. The same storage conditions were used as in Example 13, following which the product was heated at 180° C. for 12 mins. The dough was crispy and hard and the filling was creamy and pleasant to taste.
The procedure of Example 14 was repeated without use of ethylcellulose.
A baked warm pastry base (10 cm) was placed on a grid and heated for 8 mins at 180° C. in an oven. The base was allowed to cool and the same creamy chicken filling as in Example 13 was added. The storage condition was the same as for Example 14. The product was heated at 180° C. for 12 mins. The pastry base was soggy and chewy in texture.
A baked warm pastry base (10 cm) was placed on a grid and brushed with the melted composition of Example 13 using 15% ethyl cellulose and 85% palm oil. The base was then allowed to cool and the same creamy chicken filling of Example 13 was added. The storage conditions were the same as for Example 13. The products were heated at 180° C. for 12 mins. The dough was crispy and hard and the filling was creamy and had a pleasant texture.
The procedure of Example 15 was repeated without use of ethyl cellulose.
A warm baked pastry base (10 cm) was placed on a grid and brushed with a melted composition of Example 13. The base was then allowed to cool and the chicken filling of Example 13 was added. The storage conditions were the same as for Example 13. The products were heated at 180° C. for 12 mins. The dough was soggy and chewy in texture.
The following general procedure was employed.
Stabilized substrates prepared in accordance with Example 3 were coated with a primary aqueous coating liquid as described in Example 4. A bonding crumb coating as described in Example 7 was applied followed by a secondary aqueous coating. A secondary aqueous coating was applied as described in Example 5.
Next, a coating of the coarse crumb as described in Example 6 (particle size 3-4 mm) was applied using a CrumbMaster applicator manufactured by CFS, Bakel, Netherlands.
Following application of the first and second crumb layers the coated substrates entered a fryer.
The coated products were fried using pure rapeseed oil contained in an elongate reservoir and heated to a constant temperature of 180 to 188° C.
Parallel upper and lower conveyors were used to prevent the substrate pieces from floating during passage through the fryer. A frying time of 2 minutes 20 seconds was used although this may be varied dependent on the weight and size of the particles. After frying the core temperature of the particles was in the range 74-85° C. A small loss of weight was observed due to loss of water from the substrate, but this was mostly compensated for by an uptake of oil.
Following frying the fried products were transferred directly and without delay to a freezing station. The moisture content of the coatings was measured after final preparation and storage for periods of 0, 2, 4, 6, 8 and 10 weeks in a freezer. The moisture levels were measured by removing the coatings and measurement of the water content of the removed coating material, by drying the samples of material and measuring their loss in weight.
The experiments were repeated five times and the results were averaged to obtain mean values.
(i) A bonding crumb was prepared using the following formulation.
A second batch of samples was prepared using the above formulation without calcium phosphate.
The moisture contents were measured after removal from the storage freezer and before final preparation in a microwave or combi-microwave oven.
The first batch of the frozen products was reheated in a solo microwave oven. A second batch of the products was reheated using a combination microwave/thermal oven. The results are as shown below.
The products which were reheated in a solo microwave oven and in a combination microwave and thermal oven both showed a significant reduction in the moisture level of the coating in comparison to the control samples. The reduction of water content was observed to be largely independent of the storage time in the freezer.
Moisture level (wt %) in the removed coating after storage and before final preparation in relation to storage time in freezer.
(ii)The procedure (i) was repeated using a bonding crumb formulation containing no ethylcellulose containing calcium phosphate. The moisture content (wt %) results are shown in the following table. Such a high moisture level resulted in a loss of crispness and mouthfeel when the products were reheated in a microwave or combi-microwave oven. The products were discarded.
(iii) Control experiments using formulations without either ethylcellulose or calcium phosphate provided coatings with moisture levels of about 30 wt %. Such high moisture levels resulted in the loss of crispness of the coating and delivered an unacceptably soggy product after final preparation in both combi and solo microwave ovens.
The overall results demonstrated that use of ethylcellulose in the bonding crumb layer had a significant effect in reduction of the moisture level in the whole of the crumb coating layer, consisting predominantly of the outer crumb, during storage in a freezer. Omission of the ethylcellulose resulted in a moisture level with was at least about 7 wt % higher. Omission of both ethylcellulose and calcium phosphate resulted in a moisture level about 30 wt % higher.
This application is a continuation-in-part of and claims priority to U.S. patent application Ser. No. 14/991,742, filed on Jan. 8, 2016, entitled “COATED FOOD PRODUCTS,” the disclosure of which is hereby incorporated herein by reference in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 14991742 | Jan 2016 | US |
| Child | 15400883 | US |
