Patent Application
20170150732
This invention relates to cooking fats and particularly to cooking fats that are suitable as substitutes for butter—especially for commercial baking, although they can also be used as substitutes for butter in general domestic baking and cooking applications.
Traditionally, a wide variety of baking recipes required the use of butter, but butter has lost some popularity due to its high cost. As a result, many attempts have been made to substitute butter in baking, but substitutes have fallen short on replicating any one of the taste, texture, melting points, boiling points, etc. of pure butter.
Some of the attempts made to replace butter include margarines and spreads that are manufactured using vegetable fats without significant quantities of dairy fats and therefore have molecular structures that differ substantially from dairy fats. These margarines and spreads are typically intended to replace butter as a spread on bread, with a butter-like taste and texture, but that is soft at typical food refrigeration temperatures. Low fat and regular spreads typically contain fats in the form of hydrogenated vegetable oils. In the hydrogenation process, in an attempt to prolong shelf life, essential fatty acids in the relatively healthy plant oils are replaced by hydrogenated fats, which are known to pose various health risks. Such spreads and margarines also typically contain synthetic colorants and preservatives—which also pose health risks.
Increases in international butter prices have caused industrial consumers to consider using blends as an alternative to butter in their recipes, although being allowed to claim use of real butter on retail product packaging holds advantages (because consumers are familiar with the taste and textural advantages of real butter).
When baking with currently available margarine or blends (using vegetable oils or even canola oil), the results achieved differ significantly from the results obtained when using butter, because the vegetable oils produce an oily residue, an undesirable bitter taste in the final baked product, and baked products that are brittle and prone to cracking.
The present invention seeks to provide a cooking fat that can be used as a substitute for butter, with attributes that simulate butter as closely as possible, in a cost-effective and healthy manner. The invention particularly seeks to provide a cooking fat to substitute butter in baking and further particularly seeks to avoid the adverse health effects of hydrogenated fats, colorants and preservatives.
According to a first aspect of the present invention there is provided a cooking fat product for use as a substitute for butter, said cooking fat product comprising butterfat and palm oil as its main ingredients (by volume), characterised in that said main ingredients comprise between 70% and 90% of the cooking fat product (by volume), said palm oil does not exceed 50% of the cooking fat product (by volume), said palm oil is a refined and deodorised fat with a melting point approximately equal to that of butter, and said cooking fat product has an overall moisture content between 16% and 18% (by volume).
The palm oil preferably has a slip melting point of 33 to 35 degrees Celsius; the cooking fat product preferably has an overall moisture content of about 16% (by volume), and the palm oil preferably comprises about 40% of the cooking fat product (by volume).
The cooking fat product may include at least one culture flavour selected from:
The cooking fat product may further include dry milk solids such as spray dried buttermilk solids, alpha mixed tochopherol, and/or a stabiliser such as sodium hydroxide.
The cooking fat product may have a pH of between 5 and 5.5, e.g. an approximate pH of 5.2.
According to another aspect of the present invention there is provided a process for preparing a cooking fat product as described herein above, said process comprising:
heating the ingredients of the cooking fat product to an elevated temperature between 75 and 100 degrees Celsius;
stabilising the heated ingredients at the elevated temperature for between 10 and 30 minutes; and
gradually cooling the ingredients over a period of 30 to 45 minutes so that the ingredients crystallize at a temperature between 20 and 32 degrees Celsius.
The elevated temperature to which the ingredients are heated may be about 84 degrees Celsius and the step of cooling the ingredients to crystallize, may take place in a scrape surface cooler.
For a better understanding of the present invention, and to show how it may be carried into effect, the invention will now be described by way of non-limiting example.
Approximately equal parts of butter fat (butter or cream) and palm oil (by mass), as well as water and butter cultures are combined and are heated with low temperature steam to an elevated temperature that is well above the melting points of the butter fat and palm oil. The steps of combining and heating these ingredients need not take place sequentially, although it is preferred that they be combined at room temperature and then heated together. The low temperature steam needs to be hot enough to melt the fats—i.e. it should be above 35° C. and its temperature can be higher, but preferably it should not exceed 95° C. Likewise, the elevated temperature to which the ingredients are heated can be any temperature above the melting points of the fats, but for good blending of the fats, the elevated temperature should be between 75 and 100° C.—preferably about 84° C.
The combined ingredients are held at the elevated temperature for a prolonged period of 10 to 30 minutes to stabilize the mix and it is not essential, but the ingredients are preferably gently stirred during this step, while the and then the ingredients are slowly allowed to cool, preferably over a period of 30 to 45 minutes, to a temperature between 20° and 32° C. in a “cold mix” production facility to crystallize with a scrape surface cooler with shear mixing between 32° C. and 20° C.—to allow crystal formation of very small mixed fat globule, to ensure stability of the fats. It should be mentioned that “crystallization” in this context refers to the process by which the fats become solid and the term does not refer to the formation of a course-textured structure. The formation of large fat globules that result in a course texture is also termed “crystallization” in the art and is highly undesirable in the present invention. In fact, the purpose of gradual cooling and crystallization in a scrape surface cooler, is to ensure a smooth texture.
The heating and cooling processes preferably take place vessels that are covered to a sufficient extent to prevent significant moisture loss. One example of a suitable vessel for heating the ingredients in Stetton pot or similar.
The butter fat is preferably sweet cream butter made from fresh cows' milk, although the invention can potentially also be applied using butter fat produced by other methods.
The palm oil can be any palm oil with a melting point that resembles that of butter—which melts at 32 to 35 degrees Celsius. Suitable palm oils will thus be in a semi-solid state at room temperature and will soften and melt similarly to butter. Suitable palm oil for the present invention is preferably refined, bleached and deodorized palm oil (RBDPO) and is preferably produced by environmentally acceptable methods, in accordance with the requirements of the Roundtable on Sustainable Palm Oil (RSPO) organisation. One example of a suitable palm oil is Chocreme™ grade, supplied by Hudson & Knight (Pty) Ltd of South Africa, which is a refined and deodorised palm oil with a slip melting point of 33 to 35 degrees Celsius—i.e. its melting point is approximately equal to that of butter.
The quantities and details of the ingredients used in the specific example are:
The quantity of water combined with the other ingredients is varied according to the moisture contents of the palm oil, so that the overall moisture contents of the combined ingredients is between 16% and 18% (by volume)—preferably as close as possible to 16% (by volume).
The culture flavouring preferably includes any one or more of the following strains:
In a preferred embodiment, the culture flavouring includes a mixture of all three of these strains.
The culture flavouring can be prepared using any suitable substrate, but preferably the substrate comprises dry milk solids in the form of spray dried buttermilk powder. (Buttermilk contains almost all the Phospholipids (stabilizer/emulsifier) found in milk).
The completed blend, which is now in the form of a cooking fat product according to the invention, is cooled to a temperature where it is still soft enough for processing, e.g. about 25° C. and is packed into any desired containers, although sealed containers are preferred, such as 25 kg cardboard cartons with polymeric inner liners, or the like.
Apart from the need to cool the combined product gradually to avoid large crystal formation, it is also essential to allow the cooking fat product to cool gradually to room temperature to avoid formation of surface moisture.
Analytical, nutritional and microbiological data for the cooking fat product of the example are:
Analytical Data (in volume percentage):
Microbiological Data
The pH of the cooking fat product is preferably between 5 and 5.5 and in the example, it is 5.2.
One of the main reasons why existing combinations of dairy fats and vegetable fats are not suitable for baking, is that the dairy and vegetable fats separate when they are exposed to heat during the baking process, resulting in baked products that are oily, have an undesirable bitter taste and are dry and brittle. These adverse effects are not noticed in products baked using a cooking fat product of the present invention as a substitute for butter and it is believed that these adverse effects are avoided because the butter fat and palm oil do not separate when exposed to heat because they have behave very similarly when exposed to heat. In particular, they have practically the same melting point.
Another reason why it is believe that existing combinations of dairy fats and vegetable fats are not suitable for baking, is that the moisture contents of these combinations is not suitable for baking and is usually too high in fat products intended as spreads. According to the present invention, the moisture contents of the fat product is maintained at around 16% (by volume) and it is believed that this has an effect on the elasticity of dough produced using the product. High moisture contents can result in baked products having an undesirable texture, can crack too easily and can have a bitter taste. Low moisture contents can result in the baked products being dry and having a burnt taste.
Blends containing vegetable, canola and other oils produce tend to be “softer” and more “spreadable” at refrigeration temperature, which has obvious retail/domestic appeal as spreads (compared to butter that is often hard and difficult to use at typical refrigeration temperatures). Producing such blends has also been done so extensively for many decades that it has become the industry norm. Palm oil, by contrast, is harder than these blends when it has been refrigerated (similar to butter). As a result, palm oil is has not until the current invention, been considered suitable for use as an ingredient for producing a butter substitute for baking, but it has been found that palm oil does not interfere with the butter taste profile and it does not produce an oily residue when baking—thus providing a butter substitute far superior to the prior art. Palm oil is also a non-hydrogenated fat.
The product of the present invention does not contain any hydrogenated fats, colorants or preservatives, yet has an appearance and taste that resembles butter. (Its colour is yellow to light yellow and its flavour and taste are free from rancidity and off-flavours.) The product can be produced at a substantially lower cost than butter. The shelf life of the product is typically about 24 months, when stored in food grade export cartons with poly liner, under optimal (dry) storage conditions (maximum temperature—18° C.)
The invention has been described above in respect of butter substitutes for baking purposes, but the invention can also be used as a substitute for butter in a variety of other domestic and industrial applications.
| Number | Date | Country | Kind |
|---|---|---|---|
| 1411693.3 | Jul 2014 | GB | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/IB2015/054962 | 7/1/2015 | WO | 00 |
