Patent Application
20170112173
Field of the Invention
The present invention relates to a topical seasoning for a snack food, such as a starch-based snack food for example a potato chip or an expanded snack food produced from a starch-based snack food pellet. The present invention also relates to a snack food seasoned with a topical seasoning.
Description of the Related Art
It is well known to employ topical seasoning for flavouring snack foods, for example starch-based snack foods, typically in the form of snack chips, such as potato chips or expanded snack foods produced from a starch-based snack food pellet. On subsequent cooking, the pellet expands to produce an expanded low density porous snack food.
Known topical seasonings include triglycerides, in the form of oil, typically vegetable oil such as sunflower oil, since many snack foods require a topical oil seasoning to meet the taste demands of the consumer. The oil tends to provide the required texture and mouth feel to savoury snacks, particularly salty snacks. Such topical seasonings may include sodium chloride crystals, in micronised or larger particle dimension, mixed with other seasoning ingredients.
There is a general desire to reduce the oil and fat content of many foods, including processed foods such as snack foods. However, for snack foods, there is a problem of achieving a reduced oil or fat content of the snack food product, for example by reducing the oil content of, or eliminating the presence of oil in, the topical seasoning, while also achieving the desired taste, texture and mouth feel sensation required by consumers.
The present invention aims to solve this problem of the production of known topical seasoning for snack foods.
The present invention aims to provide a topical seasoning for snack foods having a reduced oil content but without diminishing the desired taste, texture and mouth feel sensation required by consumers and provided by conventional topical oil seasonings.
Accordingly, the present invention provides a topical seasoning for snack foods, the topical seasoning being in the form of an emulsion and comprising a plurality of seasoning particles as a particulate phase within a continuous oil phase, the seasoning particles comprising a shell surrounding an encapsulated central core, the shell comprising a matrix including at least one solid lipid and a shell stabilising emulsifier, and the core comprising an aqueous phase.
The present invention further provides a snack food seasoned with the topical seasoning of the present invention.
The snack food may be composed of a cut vegetable piece, such as a slice, or may have been prepared from a dough which has been shaped into a desired shape. The snack food may be an expanded snack food prepared from a pellet. The snack food has been cooked, for example by fried, baked, microwaved, directly extruded or popped.
Preferred features of all of these aspects of the present invention are defined in the dependent claims.
Embodiments of the present invention will now be described by way of example only, with reference to the accompanying drawings, in which:
The present invention is at least partly predicated on the finding by the present inventors that an aqueous composition, either as water or as an aqueous gel, can be present in an encapsulated central core surrounded by a shell comprising a matrix including at least one solid lipid, which can form a seasoning particle which has particular application as a topical seasoning for snack foods.
Surprisingly it has been found that encapsulating the aqueous composition within a lipid shell can provide a reduced oil content in topical seasoning, thereby permitting a lower oil and fat content of snack food products to be achieved, without negatively impacting on the achievement of the desired taste, texture and mouth feel sensation required by consumers as compared to conventional topical oil seasonings.
In effect, the oil is partly provided in a shell form encapsulating an aqueous core; the aqueous core displaces a proportion of the oil content, but since the seasoning particle has a shell comprising the triglyceride in the oil, and the shell has a robustness so as not to have a high degree of dissolution, dispersion or fracture when present in the mouth, the taste, texture and mouth feel sensation are not significantly affected.
The lipid shell is formulated so that it does not tend to dissolve, disperse or fracture in the mouth, despite an elevated temperature, shear forces produced by chewing and the aqueous environment provided by saliva, so that the aqueous core tends not to be released into the mouth.
The result is a lower oil topical seasoning with a taste, texture and mouth feel sensation which are associated by consumers with conventional topical oil seasonings.
The seasoning particles are produced, and are provided for the seasoning operation, in a liquid oil, for example sunflower oil, which acts as a sprayable liquid vehicle for controllably dispensing the seasoning particles onto the surface of the snack food. The use of a topical oil seasoning is well known in the snack food industry. The conventional spraying equipment can be used to dispense, in a single operation, both topical oil and seasoning particles containing the aqueous core.
According to the present invention, there is provided a topical seasoning for snack foods. The seasoning comprises a plurality of seasoning particles.
Referring to
In one embodiment, the core 6 comprises water.
In another embodiment, the core 6 comprises an aqueous gel, including a water soluble polysaccharide, for example xanthan gum or calcium alginate, as a gelling agent. However, other water soluble polysaccharide gelling agents may be employed. Typically, the aqueous gel has a polysaccharide concentration of from 0.5 to 5 wt %, optionally from 1 to 2 wt %, typically about 1.5 wt %, based on the weight of the aqueous gel.
Typically, the core 6 is substantially spherical. The core 6 may have a maximum width dimension of from 2 to 100 μm. The core 6 may have diameter which is from 15 to 96% of a diameter of the particle 2. Typically, the shell 4 is substantially spherical. The shell 4 may have a maximum width dimension of from 10 to 150 μm and/or a wall thickness of from 1 to 75 μm. The shell 4 may have a wall thickness which is from 2 to 42.5% of a diameter of the particle 2.
Typically, the at least one solid lipid comprises at least one crystalline fat, for example the lipid comprises at least one triglyceride.
Most preferably, the at least one solid lipid comprises a mixture of at least one monoglyceride and at least one triglyceride. In such a mixture, the at least one solid lipid comprises from 0.25 to 5 wt %, optionally from 0.25 to 1 wt %, monoglyceride(s) and from 95 to 99.75 wt %, optionally from 99 to 99.75 wt%, triglyceride(s), each amount being based on the total weight of the mixture of monoglyceride(s) and triglyceride(s).
The shell 4 further comprises, in addition to the monoglyceride(s) and triglyceride(s), a shell stabilising emulsifier, which functions to reduce the tendency of the glyceride shell to dissolve, disperse or fracture when present in the mouth when the snack food is consumed. The shell stabilising emulsifier typically comprises a polymeric emulsifier, typically a polyglycerol fatty acid ester, for example polyglycerol polyricinoleate (PGPR), or a phospholipid emulsifier, such as lecithin. Typically, the shell stabilising emulsifier has an approximate concentration in the shell of from 0.2 to 2 wt %, optionally from 0.5 to 1 wt %, based on the weight of the shell, which concentration is substantially the same concentration of the emulsifier based on the weight of the emulsion.
As described hereinbelow with respect to the manufacture of the particle, the shell is stabilised by the shell stabilising emulsifier, which is believed, without being bound by any theory, to migrate to the water/oil interface in a pre-emulsion so as to function to lower the surface energy of the water/oil interface and stabilise water droplets in the oil phase. Furthermore, the monoglyceride functions as an emulsifier to form a Pickering particle in the oil phase, which stabilises the shell. The Pickering particle comprises the monoglyceride- and triglyceride-containing lipid shell, which further comprises the shell stabilising emulsifier, surrounding the core which comprises the aqueous phase, thereby forming a water-in-oil emulsion with the stabilised shell surrounding the aqueous phase.
The monoglyceride surfactant functions to form seed crystals during formation of the shell when the lipid mixture is cooled from the melt to below the melting temperature of the lipid components. These seed crystals are formed at, or migrate to, the interface of the aqueous phase and the oil phase in the water-in-oil emulsion, which has a lower surface energy as a result of the shell stabilising emulsifier. The seed crystals agglomerate together to form a shell surrounding an aqueous phase droplet. After the monoglyceride seed crystals have been formed, the triglyceride crystallises onto the seed crystals, thereby forming a coherent shell surrounding the aqueous phase core. The coherent shell includes the shell stabilising emulsifier which increases the robustness of the shell against dissolution, dispersion or fracture when consumed in the mouth. In this way, the encapsulated aqueous phase remains encapsulated when the snack food carrying the encapsulated particles is employed in the topical seasoning.
Although the presence of the monoglyceride surfactant, which acts as an emulsifier, causes fat crystals preferentially to agglomerate at the oil phase/aqueous phase interface and thereby form a shell, some solid fat crystals may remain within the continuous oil phase of the emulsion and are not incorporated into a shell.
Preferably, the at least one solid lipid comprises a vegetable-based triglyceride, for example an unsaturated triglyceride derived from at least one of sunflower oil and cottonseed oil. Preferably, a high oleic acid sunflower oil is employed. Typically, the sunflower oil comprises at least 80 wt % oleic acid based on the total weight of fatty acids in the sunflower oil. In preferred embodiments, the at least one solid lipid has a melting point of from 30 to 95° C.
Preferably, the at least one solid lipid also comprises a saturated monoglyceride, which is a fatty acid glyceryl monoester, with the fatty acid chain having an average of from 10 to 20 carbon atoms, typically an average of from 12 to 18 carbon atoms. Typically the monoglyceride has been distilled to provide the desired purity of the selected carbon chain length monoglyceride. The monoglyceride is typically derived from sunflower, rapeseed, palm and/or soya bean oil. Alternatively a synthetic monoglyceride is employed. A typical monoglyceride is an emulsifier comprising glycerol monolaurate, glycerol monostearate or an emulsifier available in commerce from Danisco, UK, under the trade name Dimodan HP or Dimodan P, or any mixture thereof.
In some preferred embodiments, the at least one solid lipid comprises from 3 to 15 wt % of the total weight of the seasoning particle. In some preferred embodiments, the core comprises from 15 to 96 wt % of the total weight of the seasoning particle.
The topical seasoning is in the form of an emulsion, with the plurality of seasoning particles comprising a particulate phase within a continuous oil phase. The oil phase may comprise at least one of a monoglyceride, a triglyceride or a mixture thereof, for example a vegetable-based oil, typically an unsaturated oil derived from at least one of sunflower oil and cottonseed oil. Preferably, a high oleic acid sunflower oil is employed. Preferably, the sunflower oil comprises at least 80 wt % oleic acid based on the total weight of fatty acids in the sunflower oil.
The at least one solid lipid may comprise from 1 to 20 wt % of the total oil and fat content of the topical seasoning and the continuous oil phase comprises from 80 to 99 wt % of the total oil and fat content of the topical seasoning. Typically, the total oil and fat content of the topical seasoning is from 40 to 80 wt % of the total weight of the topical seasoning.
A snack food may be seasoned with the topical seasoning of the present invention using any known seasoning technique or apparatus. For example, the topical seasoning in the form of an emulsion may be sprayed from a spray head onto the cooked snack food prior to packaging.
The topical seasoning of the present invention, as described above, may be made according to the following method, with reference to
Aspects of this method for forming fat-crystal stabilised water-in-oil emulsions are disclosed in “Fat-crystal stabilised w/o emulsions for controlled salt release”, Sarah Frasch-Melnik et al, Journal of Food Engineering 98 (2010) 437-442, “W1/O/W2 double emulsions stabilised by fat crystals—Formulation, stability and salt release”, Sarah Frasch-Melnik et al, Journal of Colloid and Interface Science 350 (2010) 178-185 and “Fat-crystal stabilised water-in-oil emulsions as controlled release systems”, Maxime Nadin et al, LWT-Food Science and Technology 56 (2014) 248-255. Although these publications disclose the production of stabilised water-in-oil emulsions for releasing a component such as salt, there is no disclosure or hint of the use of such emulsions as topical seasoning for snack food, or the unexpected effect of the reduction of oil content of such topical seasonings without negatively impacting on taste, texture or mouth feel of the snack food.
In a first step, at least one lipid, to form the shell, is heated so as to be liquefied. The at least one lipid comprises the composition described above with respect to
Then, as illustrated in
In the embodiment to form an aqueous gel as the core, the polysaccharide gelling agent has a concentration in the aqueous phase of from 0.5 to 5 wt %, optionally from 1 to 2 wt %, typically about 1.5 wt %, based on the weight of the aqueous phase.
Typically the weight ratio of the aqueous solution to the at least one lipid is from 30:70 to 70:30, typically about 60:40.
The pre-emulsion 20 is subjected to additional emulsification of the initial mixture to form a more well dispersed water in oil emulsion comprising aqueous phase particles or droplets in a continuous oil phase, whilst simultaneously cooling the emulsion to form a plurality of seasoning particles in the oil phase.
As illustrated in
As illustrated in
As illustrated in
The resultant seasoning particles 34 comprise a shell 30 surrounding an encapsulated central core 32. The shell 30 comprises a matrix 36 including the at least one solid lipid and the core 32 comprises the aqueous phase, which may include the optional polysaccharide gel.
As described above, during the additional emulsification the cooling forms solid lipid crystals in the oil phase which migrate to an interface between the aqueous phase particles and the continuous oil phase, and the crystals agglomerate to form the shell.
During the additional emulsification step, the emulsion is cooled to a temperature below 30° C., for example below 25° C. Typically, the additional emulsification is at least partially carried out in a cooling unit which is a scrape-surface heat exchanger having at least one surface cooled to a temperature of from 5 to 30° C., optionally from 5 to 25° C. The cooling unit may comprise an outer housing defining a cooling chamber and a rotating scraper mechanism within the chamber which scrapes solid lipid material off an inner surface of the outer housing. Typically, the rotating scraper mechanism has a rotational speed of from 500 to 2000 rpm.
After the additional emulsification, the plurality of seasoning particles in the oil phase may be passed, in a second mixing step, through a mixer to cause breakage of solid lipid linkages between seasoning particles. This may also reduce the particle size. The mixer may comprise a rotating pin stirrer.
After the second mixing step, the resultant mixture may optionally be recycled through the additional emulsification which again simultaneously cools the emulsion. Optionally, after the additional emulsification, the resultant mixture may be recycled through the second mixing step. Such recycling steps may cause further breakage of any solid lipid linkages between seasoning particles and may also further reduce the particle size. However, such linkages tend to provide a desirable creamy mouthfeel to the topical composition when applied to a snack food and so the recycling steps may be avoided.
The product of the final mixing step is an emulsion ready to use as a topical seasoning according to the present invention.
The topical seasoning may be applied to any starch-based snack food, for example a potato chip, which may be baked or fried and/or produced from a potato slice or a dough, or an expanded snack food produced from a starch-based snack food pellet, to apply seasoning thereto. The resultant savoury or salty snack food, such as a potato chip, has a lower oil/fat content, yet with a similar taste, texture and mouthfeel, as compared to the same snack food seasoned with a conventional topical oil seasoning.
Typically the application dosage of the topical seasoning is from 5 to 10 wt %, for example from 7 to 8 wt %, based on the weight of the seasoned snack food such as potato chips. The topical seasoning typically comprises from 65 to 70 wt % oil/fat, thereby yielding a 30 to 35 wt % oil/fat reduction in the topical seasoning.
The present invention is further illustrated with reference to the following non-limiting Examples.
Potato chips, which had been produced by baking a potato-containing dough, were spray coated with a conventional topical oil seasoning comprising high oleic acid sunflower oil. The application dosage was selected to provide 7.4 wt % topical oil based on the weight of the seasoned potato chips.
The seasoned potato chips were subjected to a taste test, and exhibited a good texture and mouth feel.
A water-in-oil emulsion was formed comprising 60 wt % aqueous phase and 40 wt % oil phase.
The aqueous phase comprised (a) a shell stabilising emulsifier composed of polyglycerol polyricinoleate (PGPR) having a concentration of 0.7 wt % based on the weight of the aqueous phase, (b) a polysaccharide gelling agent composed of xanthan gum having a concentration of 1.5 wt % based on the weight of the aqueous phase and (c) water.
The oil phase comprised 99.5 wt % high oleic acid sunflower oil and 0.5 wt % Dimodan HP, an emulsifier comprising a distilled saturated monoglyceride. The water-in-oil emulsion was heated to a temperature of 80° C. and mixed in a high shear mixer to form a pre-emulsion. The pre-emulsion was then passed through a scraped-surface heat exchanger (called an “A unit”), and subsequently through a pin stirrer (called a “C unit”), both apparatus being known in the art for making fat-containing emulsions in the food industry. The scraped-surface heat exchanger and the pin stirrer were both cooled by water at a temperature of 5° C. The oil phase in the water-in-oil emulsion rapidly crystallised in the scraped-surface heat exchanger to form fat crystals, as discussed above, and the pin stirrer applied shear to cause phase inversion under cooling to prevent the fat crystals from melting.
After exiting the pin stirrer, the resulting product comprised a water-in-oil emulsion of seasoning particles in a continuous oil phase, the particles comprising a lipid shell surrounding an encapsulated central core comprising an aqueous gel.
The emulsion was sprayed onto the same baked potato chips as used in Comparative Example 1 to provide a topical seasoning. The application dosage was selected to provide 7.4 wt % topical seasoning, having a 65.6 wt % oil/fat content in the form of triglyceride and monoglyceride, based on the weight of the seasoned potato chips.
The seasoned potato chips were subjected to the same taste test as Comparative Example 1. The seasoned potato chips of Example 1 exhibited a similarly good texture and mouth feel as Comparative Example 1 even though the oil/fat content of the topical seasoning had been reduced by 34.4 wt %.
Example 1 was repeated, but modified so as to omit the gelling agent.
The emulsion was sprayed onto the same potato chips as used in Example 1 to provide a topical seasoning. The application dosage was selected to provide 7.4 wt % topical seasoning, having a 65.6 wt % oil/fat content in the form of triglyceride and monoglyceride, based on the weight of the seasoned potato chips.
The seasoned potato chips were subjected to the same taste test as Comparative Example 1. The seasoned potato chips of Example 1 exhibited a similarly good texture and mouth feel as Comparative Example 1 even though the oil/fat content of the topical seasoning had been reduced by 34.4 wt %.
A comparison of Examples 1 and 2 with Comparative Example 1 shows that the topical seasoning of the present invention can readily be used to reduce the oil/fat content of snack foods by modification of the topical oil seasoning but without compromising the desired taste and texture of the snack foods.
Surprisingly it has been found therefore that encapsulating an aqueous phase, which may or may not be a gel, within a lipid shell can provide a reduced oil/fat content, since the aqueous phase replaces a portion of the oil/fat phase, in topical seasoning, thereby permitting lower oil/fat content of snack food products to be achieved.
As a result of the presence of the shell stabilising emulsifier in the lipid shell, the lipid shell does not tend to dissolve, disperse or fracture in the mouth, even when subjected to elevated temperature, high shear forces caused by chewing, and the aqueous environment provided by saliva. Accordingly, the encapsulated aqueous phase remains encapsulated and so does not affect the flavour, texture or mouth feel provided by the topical seasoning, which retains the desired properties of a conventional topical oil seasoning found to be acceptable to the consumer.
Various modifications to the present invention will be readily apparent to those skilled in the art.
| Number | Date | Country | Kind |
|---|---|---|---|
| 1407712.7 | May 2014 | GB | national |
This application is a US 371 National Stage Application from PCT/EP2015/058989 filed Apr. 24, 2015, which claims priority to GB Application 1407712.7 filed May 1, 2014, the disclosures of which are incorporated herein by reference.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2015/058989 | 4/24/2015 | WO | 00 |
