WO2009036493A1 - Wheat gluten modified for food application - Google Patents
Wheat gluten modified for food application Download PDFInfo
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- WO2009036493A1 WO2009036493A1 PCT/AU2008/001369 AU2008001369W WO2009036493A1 WO 2009036493 A1 WO2009036493 A1 WO 2009036493A1 AU 2008001369 W AU2008001369 W AU 2008001369W WO 2009036493 A1 WO2009036493 A1 WO 2009036493A1
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- Prior art keywords
- wheat gluten
- protein
- food
- enzyme
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Classifications
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23J—PROTEIN COMPOSITIONS FOR FOODSTUFFS; WORKING-UP PROTEINS FOR FOODSTUFFS; PHOSPHATIDE COMPOSITIONS FOR FOODSTUFFS
- A23J3/00—Working-up of proteins for foodstuffs
- A23J3/14—Vegetable proteins
- A23J3/18—Vegetable proteins from wheat
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23J—PROTEIN COMPOSITIONS FOR FOODSTUFFS; WORKING-UP PROTEINS FOR FOODSTUFFS; PHOSPHATIDE COMPOSITIONS FOR FOODSTUFFS
- A23J3/00—Working-up of proteins for foodstuffs
- A23J3/30—Working-up of proteins for foodstuffs by hydrolysis
- A23J3/32—Working-up of proteins for foodstuffs by hydrolysis using chemical agents
- A23J3/34—Working-up of proteins for foodstuffs by hydrolysis using chemical agents using enzymes
- A23J3/346—Working-up of proteins for foodstuffs by hydrolysis using chemical agents using enzymes of vegetable proteins
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L19/00—Products from fruits or vegetables; Preparation or treatment thereof
- A23L19/10—Products from fruits or vegetables; Preparation or treatment thereof of tuberous or like starch containing root crops
- A23L19/12—Products from fruits or vegetables; Preparation or treatment thereof of tuberous or like starch containing root crops of potatoes
- A23L19/18—Roasted or fried products, e.g. snacks or chips
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
- A23L33/10—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
- A23L33/17—Amino acids, peptides or proteins
- A23L33/18—Peptides; Protein hydrolysates
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
- A23L33/10—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
- A23L33/17—Amino acids, peptides or proteins
- A23L33/185—Vegetable proteins
Definitions
- the present invention relates to wheat gluten ingredients that have been enzymaticalr) -modified to render them suited for incorporation in extruded and expanded foods and to such foods with consequent enhanced nutrition due to incorporation of such enzymatically-modified wheat gluten ingredients.
- snack foods may be items of fresh foods including fresh fruits and vegetables containing low levels of fat and salt and assessed as having a low glycaemic index as defined in "Glycemic index of foods: A physiological basis for carbohydrate exchange'.
- foods manufactured for flavour, convenience and enjoyment may be selected that may contain levels of fat, salt, sugar and starch considered to be excessive for healthy living and likely to cause consumers to be overweight as reported in 'The Australian Diabetes, Obesity and Lifestyle Study'. (2005)
- the provision of a high concentration of protein in snack products has been described in US Patent 6,051,492 wherein the protein, particularly soy protein, is provided in a textured form with fruit or savoury flavour and a semi-chewy or crisp texture.
- US Patent 4,126,705 describes a process for making a dehydrated protein snack food from protein material such as raw meat, poultry, fish etc.
- US Patent 4,183,966 describes a method for manufacturing a high protein snack food from cheese whey and yeast mixed with a starch base from potato or corn starch and other ingredients to make dough that can be extruded into pieces that can be fried.
- US Patent 4,212,892 describes a method of making a high protein snack food from a protein-rich gel derived from fish or soybean mixed with starch or flour to make a mass that can be extruded in the form of chips.
- US Patent 4,124,727 describes the preparation of nutritionally balanced protein snack foods prepared from legume seeds. After combining with cereal grain flours and water, a dough is formed that can be extruded into sheets cut in pieces and fried.
- High protein snack foods are also described in Canadian Patent 1021994 in which a puffed fried snack food contains protein and gelled starch derived from non-oilseed legumes, for example; peas, faka beans, white pea beans and kidney beans. Cereal flour for example from wheat corn or rice and vegetable protein concentrate may also be included. The final protein content is normally 12 to 30% and the starch content is 40 to 70%. For reasons of improved palatability, generation of flavour, provision of nutritional availability and improved functionality for incorporation into foods, proteins may be modified by enzymatic processes.
- Enzymatic hydrolysis of proteins is well known to generate flavour in products. Such flavour may be considered detrimental for the use of the product in foods and a process such as described in US Patent 4,482,574 may be used to minimise such flavour development. By contrast extensive proteolytic digestion may result in flavours of a savoury nature deemed desirable as seasonings and flavorants. Proteins from animal meats have been hydrolysed with enzymes for flavour as seasonings is described in Korean Patent No KR20060083452. US Patent 6,803,062 describes a process in which a hydrolysed protein can be used as seasoning that is first substantially sterilised by heating under acidic conditions before treatment with proteolytic enzyme derived from a microorganism.
- US Patent 6,036,983 describes a method of obtaining protein hydroly sates in which the level of free or peptide bound glutamic acid is increased by subjecting the substrate to a deamidation process in addition to a proteolytic process using specific enzymes.
- Combining protein hydroly sates may facilitate the provision of a desired nutritional composition of amino acids as described in US Patent 6,420,133, wherein a mixture of different oilseed flours is used as substrate for successive enzymatic reactions to get a final product having optimum composition of amino acids.
- the hydrolysate so obtained has molecular weight in the range 2500+/- 1000 to 10,000+/-l,500 Daltons.
- US Patent 5,520,935 describes a process for the preparation of a pea protein hydrolysate with very high purity and with desirable organoleptic properties that is fully soluble and low in phytate. Degree of hydrolysis was in the range 15- 35% and the final hydrolysate was prepared from the process stream permeating an ultrafiltration membrane with molecular weight cut-off above 5000 Daltons.
- US Patent 7,112,424 provides a process for the recover ⁇ of protein from soy flour in high concentration by means of preparation of a protein hydrolysate from soy flour using a sequential hydrolysis first with fungal protease followed by papain achieving up to 45% degree of hydrolysis and obtaining solubility of 95- 98%.
- the glycoproteins are functionally- modified for use as an egg albumin replacer or whip stabilising agent.
- an acid protease such as pepsin
- the enzymatic alteration described in US Patent 4,409,248 produces a glycoprotein with different physical and functional properties from the precursor source materials.
- the enzyme modified glycoproteins are capable of forming white opaque heat-set gels similar to those of egg albumin.
- US Patent 6,171,621 describes the preparation of a liquid protein hydrolysate food which may be a hypoallergenic infant food in which a protein substrate solution is sterilised by ultra-heat processing and into which a limited amount of protease enzyme is introduced that previously was sterilised by microfiltration. The hy drolysis is allowed to progress until the entire enzyme is consumed. This method overcomes deterioration of quality in the form of impaired coloration or taste, instability of emulsions or decreased nutritional value.
- US Patent 5,486,461 describes the conversion of essentially insoluble rennet casein to a fully soluble hydrolysate using three defined proteolytic enzymes to achieve a degree of hydrory sis of between 15 and 35% and having a number average molecular weight in the range 400-650 Daltons.
- Wheat protein has a unique amino acid composition and structure which in its natural intact form provides for its widespread use in bakery applications. The high content of glutamine can readily be converted to glutamic acid and is utilised in wheat protein hydrolysates for generating savoury flavour.
- US Patent 6,036,980 discloses a process in which glutamine-rich proteins including cereal proteins and wheat gluten are enzyme hydrorysed and the hydrolysate added to the feedstock for glutamic acid fermentation.
- Wheat protein is also well recognised for its role in eliciting the autoimmune condition known as coeliac disease. Enzymatic hydrolysis to fragment the protein to an extent that it might not elicit such condition has been described in US Patent 6,692,933 which discloses a method for producing a glutamine-rich gluten-free preparation from wheat gluten. A fully soluble product is obtained with a degree of hydrolysis up to 30%.
- Protein hyroh/sates are also used in many surface-active formulations by virtue of their dispersing properties and their ability" to influence the dermatological compatibility of anionic surfactants by interaction with the protein molecules of the skin.
- US Patent 5,945,299 discloses a method which overcomes previously encountered difficulties of discoloration and instability in storage.
- wheat gluten is modified sequentially with proteinases first at pH 2 - 5, then at pH 8-10. Finally the resulting hydrolysate is treated with peptidases at pH 6-7.
- the outcome is a wheat protein hydrolysate most preferably- in the range 2,000 - 5,000 Daltons which after filtration processes results in a clear solution which shows particularly high stability in solutio ⁇
- the object of the present invention is to provide for a wheat gluten enzymaticaHy-modified only to the extent that is required for the purpose of suitability as an ingredient in protein-rich extruded and expanded foods.
- Such snack foods may be made from dried starch pieces in which the starch is wholly or partially gelatinised and dried during passage through a hot double roller dryer and the resulting film is cut in to pieces and fried as described in US Patent 4,140,803
- wet dough containing fully gelatinised starch at 30 to 85% solids may be cut into pieces and fried as described in US Patents 3,297,450; 3,451,822 and 3,539,356.
- wet dough may be prepared containing a mixture of gelatinised and ungelatinised starch at 30 to 70 solids as described in US patent 3,997,684. With such dough when cut into pieces and fried, the expansion is only about 1.6 times the original volume compared to over three times expansion by the processes described in the previous categories. Processes and products have been described that result in snack food products with improved nutrition by incorporation of various fibre ingredients such as bran. Furthermore, grain materials, meals and flours from a variety of sources may be used as in US Patents 2,701,200; 3,656,966 and 4,526,800 to produce palatable snack food products with a fibre content useful in the diet.
- masa can be dried and the masa flour later rehydrated to form a dough for extrusion or sheeting, as described in US Patent 4,623,548.
- a dough may be prepared from a mixture of dry solids incorporating both raw or partially gelatinised, low water absorption flour and pre-gelatinised high water absorption flour as also described in US Patent 4,623,548.
- a raw starch component comprising one or more ungelatinised starches should also be included. The combination of the three components in the dough at the time of frying is critical to the process described in US Patent 4,769,253.
- the ingredients used to make corn chips, potato chips or expanded foods contain little or no gluten and consist essentially of starch but without gluten hydrated starch or gelatinous composition does not form a workable or sheetable dough.
- US Patents 4,834,996 and 5,104,673 describe a process in which heating and mixing are performed continuously in a cooker extruder which imparts a dough- like consistency that can be sheeted while hot
- An embodiment of the invention includes the use of a gluten-containing starch ingredient including wheat flour in a mixture with non-gluten containing ingredient.
- Another object of the present invention is to provide a novel process for the preparation of novel protein-rich food ingredients from wheat gluten involving the use of protease enzymes to modify the structure of the wheat proteins to an extent that the product is particularly suited to applications in extruded and expanded foods.
- a further object of the present invention is to provide food products that are beneficial to consumers due to the improved nutritional value of such foods having an elevated content of protein and consequent reduced content of other major ingredients including fats and carbohydrates achieved by incorporation of said novel protein-rich food ingredients of the present invention
- a wheat gluten for incorporation into an extruded or expanded food, the structure of the wheat gluten being modified by the addition of a protease enzyme whereby said wheat gluten shows a degree of hydrolysis in the range of about 1% to about 4%, a content of proteinaceous material having molecular weight greater than 50,000 Daltons, being less than 15% of total proteinaceous material, content of proteinaceous material having molecular weight less than 15,000 Daltons being less than 50% of total proteinaceous material, and a glass transition temperature in the range of about 50 0 C to about 59°C.
- said degree of hydrolysis is in the range of about 2% to about 3%.
- a process for producing a modified wheat gluten for incorporation into an extruded or expanded food, said process including the step of adding a protease enzyme to said wheat gluten in aqueous dispersion under suitable conditions of pH, ionic strength and temperature whereby selective peptide bond cleavage is obtained to give a degree of hydrolysis for said gluten in the range of about 1% to about 4%, a content of proteinaceous material having molecular weight greater than 50,000 Daltons, being less than 15% of total proteinaceous material, content of proteinaceous material having molecular weight less than 15,000 Daltons being less than 50% of total proteinaceous material, and a glass transition temperature in the range of about 50 0 C to about 59°C.
- said degree of hydrolysis is in the range of about 2% to about 3%.
- an extruded or expanded food which includes as an ingredient thereof a modified wheat gluten having a degree of hydrolysis in the range of about 1% to about 4%, a content of proteinaceous material having molecular weight greater than 50,000 Daltons, being less than 15% of total proteinaceous material, content of proteinaceous material having molecular weight less than 15,000 Daltons being less than 50% of total proteinaceous material, and a glass transition temperature in the range of about 50 0 C to about 59°C.
- said degree of hydrolysis is in the range of about 2% to about 3%.
- a modified wheat gluten as an ingredient of an extruded or expanded food
- said modified wheat gluten having a degree of hydrolysis in the range of about 1% to about 4%, a content of proteinaceous material having molecular weight greater than 50,000 Daltons being less than 15% of total proteinaceous material, content of proteinaceous material having molecular weight less than 15,000 Daltons, being less than 50% of total proteinaceous material, and a glass transition temperature in the range of about 50 0 C and to about 59°C.
- said degree of hydrolysis is in the range of about 2% to about 3%.
- an enz> ⁇ naticallj -modified wheat gluten composition possessing improved properties of cohesion, extension and melting that render the said composition particularly suited to incorporation at an elevated level for the manufacture of protein-rich extruded and expanded foods.
- the novel protein-rich ingredient of the present invention is derived from vital wheat gluten that is well known and characterised as a complex protein system constituted by a number of defined proteins having molecular weights in the range 5,000 to 200,000 Daltons.
- the complex protein system is further characterised by intermolecular cross-links resulting in macro-structures that provide the well known physical attributes of vital wheat gluten in an aqueous medium.
- PAGE PolyAcrylamide Gel Electrophoresesis
- a protease enzyme When a protease enzyme is added to wheat gluten in aqueous dispersion under conditions of pH, ionic strength and temperature suited to the particular protease, one or more of the peptide bonds that linearly link the constituent amino acids of the protein is cleaved. If the cleaved peptide bond is the first or last in the polypeptide structure that is the protein by a so called exo-protease or exo- peptidase then the molecular weight of the protein is reduced by just the molecular weight of the amino acid.
- cleaved peptide bond is at any other position on the polypeptide by a so called endo-protease or endo-peptidase, then two fragments are generated of sizes determined by the position of the cleaved peptide bond.
- Multiple peptide bond cleavage on the multiple proteins of wheat gluten may result in multiple structures having molecular weights different from the parent defined proteins.
- Degree of Hydrolysis the more extensive the extent of peptide bond cleavage referred to as Degree of Hydrolysis, the smaller and more diverse in size are the structures derived from such treatment
- HPLQ and Mass Spectrometry (MS) allows the Degree of Hydrolysis to be estimated and visually represented.
- Enzyme-modified wheat gluten of the present invention is characterised by a degree of hydrolysis in the range 1 to 4% and preferably in the range 2 to 3%.
- protease enzymes applied under defined conditions can be used to advantageously modify the physical properties of wheat gluten through a limited extent of and selective peptide bond cleavage that may be considered to be a low Degree of Hydrolysis in the range 1 and 4% preferably in the range 2 to 3% of all peptide bonds.
- Application of the technique of PAGE to wheat gluten so treated shows that most of the largest protein subunits categorised as high molecular weight glutenins in for example Wrigley, C.W., Robinson, P.J. and Williams, W.T. (1981) have been degraded to smaller structures in enzyme-modified wheat gluten.
- products having greater than 15% of the protein units in the higher molecular weight range 50,000 to 200,000 Daltons relative to then- content in the parent wheat gluten as determined by PAGE are inadequately modified.
- products having less than 30% of the protein units in the medium molecular weight range, 15,000 to 50,000 Daltons, and more than 50% in the lower molecular weight range, 3,000 to 15,000 Daltons, relative to their content in the parent wheat gluten as determined by PAGE are excessively modified.
- DSC Differential Scanning Calorimetry
- Natural wheat gluten shows a glass transition temperature in the range 61 to 75°C dependent on the heating rate when determined using DSC according to the method of Lawton and Wu (1993).
- Enz>maticall> -modified wheat gluten of the present invention shows a glass transition temperature in the range 45 to 60 0 C, preferably in the range 50 to 60°C.
- Use of DSC characterises the enzymatically-modified wheat gluten as having a glass transition temperature lower than that of natural wheat gluten and comparable to that of wheat starch.
- DMA Dynamic Mechanical Analysis
- Natural wheat gluten shows a glass transition temperature in the range 30 to 35°C when determined using DMA according to the method of Zhang, Hoobin, Burgar and Do (2006).
- Enzymaticalry-modified wheat gluten of the present invention shows a glass transition temperature in the range 15 to 30 0 C.
- Use of DMA characterises the enzymaticalry-modified wheat gluten as having a glass transition temperature lower than that of natural wheat gluten and comparable to that of wheat starch.
- the process of the present invention for the preparation of enzyme-modified wheat gluten particularly- suited to use in extruded and expanded foods requires the treatment of wheat gluten in aqueous dispersion with selected protease enzymes under suitable selected reaction conditions.
- Wheat gluten can be obtained in a wet form directly from a process well known for its separation from an aqueous dispersion of wheat flour such as described by Cornell and Hoveling (1998).
- said wet form from which as much free water as can be removed by physical pressing typically the total solids content of the said wet gluten is in the range 30 to 35% preferably 31 to 33% w/w and the protein content in the range 70-85% determined by the Kjeldahl or Dumas methods using the Nitrogen Conversion Factor for wheat gluten of 5.7.
- wheat gluten can be obtained in dried form having a protein content determined by the same method on the basis of dry solids in the range 70 to 85%.
- dried wheat gluten is dispersed in water in the concentration range 0 to 50% and preferably in the range 20 to 35% and most preferably in the range 28 to 33%
- a quantity of selected protease enzymes in aqueous dispersion is added with vigorous mixing to ensure uniform treatment of the wheat gluten by the protease enzymes. It will be observe that the highly cohesive and viscous wheat gluten dispersion becomes less cohesive and less viscous. After an appropriate period of time a treatment is applied to terminate the proteolytic activity of the protease enzymes.
- the selected protease enzymes may be dispersed wholly or partially in the water prior to the addition of the dried gluten such process being undertaken in either a batch or continuous mixing operation.
- the presence of protease enzyme from the initial contact of gluten and water facilitates the dispersion of the gluten and by almost immediate commencement of proteolytic breakdown of the wheat gluten protein the tendency to form a cohesive agglomerate is reduced.
- the remainder of any of the selected protease enzymes may be added at a later stage particularly in a batch process to provide greater uniformity to the degree of hydrolysis.
- protease enzymes are available in commercial quantities derived from animal, plant, fungal and bacterial sources. Most such enzymes demonstrate particular selectivities or preferences for cleavage of peptide bonds between certain amino acids in proteins and polypeptides. Some commercially available protease enzyme products contain a mixture of protease enzymes with different specificities. Some commercially available protease enzyme products contain both endo-peptidases and exo-peptidases.
- protease enzymes to use in the process for the production of enzyme modified wheat glutens of this invention are, therefore, not prescribed specifically but exemplified through non-exclusive identification of preferred protease enzymes that having been evaluated and compared to numerous protease enzyme products are recommended non-exclusively for use by their ability to modify wheat gluten to achieve the physical properties for enzyme modified wheat gluten of this invention.
- Protease enzymes from such said sources may show a magnitude of proteolytic activity that is determined by the physical and chemical conditions of the aqueous environment.
- increasing the temperature results in an increase in proteolytic activity up to a temperature at which said proteases may be de-activated due to denaturati ⁇ n of their intrinsic protein structure.
- proteins including enzymes are more soluble and hence reactive in the presence of low concentrations of ions in aqueous solution, that is, at low ionic strength. This has the effect of minimising electrostatic interactions and prevents charge- mediated flocculation.
- excessive ionic concentration has the effect of enhancing entropically driven interactions between protein molecules again resulting in insolubility.
- the ionic strength of the dispersion during proteolysis should preferably be in the range of 0.01 to 0.5 and more preferably in the range of 0.01 to 0.1.
- Some protease enzymes are proteorytically most active over a narrow and specific pH range; other protease enzymes may be active over a broad pH range.
- Wheat gluten occurs naturally in aqueous dispersion at about pH 6.
- Protease enzymes that show a high level of proteolytic activity at this pH may be preferable for the process of this invention but not exclusively as the pH of the said aqueous dispersion of wheat gluten can be changed by the addition of acid or alkali to be more suited to a particular protease enzyme product
- Selection of the reaction conditions for enzyme modification of wheat gluten in the process of this invention is not prescribed but may be determined according to the protease enzymes selected for the purpose of achieving enzyme modified wheat gluten of this invention.
- reaction conditions are recommended non-exclusively for use and exemplified for their suitability to achieve enzyme modified wheat gluten of this invention.
- the extent of enzyme modification of wheat gluten is determined by the period of contact time between the active protease enzyme and the wheat gluten in addition to the selection of a certain or preferred protease enzyme product and the selected or preferred aqueous reaction conditions.
- the period of time for contact between active protease enzyme and wheat gluten is not prescribed but may be determined and is exemplified for its suitability to achieve enzyme modified wheat gluten of this invention according to the protease enzymes selected for the purpose of achieving enzyme modified wheat gluten of this invention in conjunction with reaction conditions that are recommended non-exclusively for use.
- the contact time may preferably be a number of minutes; in a batch process the contact time may preferably be a number of hours.
- the process of the invention requires that the contact time between the active protease enzyme and wheat gluten is limited according to the requirement to achieve enzyme modified wheat gluten of this invention.
- This might be achieved by a process that would separate the protease enzymes from the wheat gluten and its enzyme-modified derivatives but is preferably achieved by inactivating the said protease enzymes.
- Any process that may disrupt the intrinsic structures of active enzymes may be suited to inactivation of the selected protease enzymes in contact with the wheat gluten.
- This might include modern techniques such as application of ultra-high pressure or ultra-sonics but may preferably be achieved by simpler and cheaper technologies including thermal denaturation, acid-shock and alkaline-shock according to the sensitivity of the selected protease enzymes to such said technologies.
- Enzyme-modified wheat glutens of the present invention are exemplified in which either thermal denaturation or acid-shock technology has been used to inactivate the selected protease enzymes.
- thermal denaturation or acid-shock technology has been used to inactivate the selected protease enzymes.
- the selection of either of these technologies for the process of this invention as preferable may depend on the application for the product and the severity of the inactivation conditions.
- the use of high temperature particularly greater than 80°C may adversely affect the colour and flavour of the enzyme-modified wheat gluten if an extended period of time at this temperature is necessary, however, ultra-high-temperature (UHT) conditions applied for a very short time may be a preferred technology.
- UHT ultra-high-temperature
- the use of acid-shock technology may involve a substantial reduction of the pH by addition of an acid while maintaining a moderate temperature for a period of time followed by restoration of the initial pH by addition of an alkali. Under these conditions the intrinsic structure of the selected protease enzymes may be irreversibly changed and the activity of the enzymes negated.
- the use of this technology for inactivation of the selected protease enzymes results in the formation of a salt that may be desirable or undesirable in the enzyme modified wheat gluten of this invention for a particular application.
- acid deamidation of glutamine and asparagine amino acid components of the enzyme modified wheat gluten may occur if the pH is sufficiently low, the temperature sufficiently high and the exposure time sufficiently long. This may adversely affect the physical properties of the enzyme-modified wheat gluten.
- the advantage of the acid-shock technology is that the use of only moderate temperature eliminates the potential to adversely affect the colour and flavour of the enzyme modified wheat gluten of this invention.
- the resulting enzyme-modified wheat gluten of the present invention is finally dried using one of a number of well known commercial drying technologies. Owing to the somewhat viscous and cohesive nature of the enzyme-modified wheat gluten in the final aqueous dispersion certain drying technologies may be preferred. An attrition drier or ring drier as often employed for drying wheat gluten may be preferable.
- Enzyme-modified wheat gluten of the present invention provides for a food ingredient that may be used to manufacture of foods having an elevated content of protein and consequent reduced content of other major ingredients including fats and carbohydrates. Furthermore, incorporation of the enzyme-modified wheat gluten of the present invention as an ingredient in said novel foods enables desirable colour and flavour to be achieved and facilitates desirable texture, shape and form characteristics to be generated in said novel foods.
- Protein-enriched expanded foods are manufactured using facilities such as single- or twin-screw extruders by incorporating a quantity of enzyme-modified wheat gluten of the present invention into a mix of predominantly starch- containing ingredients as used in the manufacture of many less nutritious expanded food types concomitantly displacing an equivalent quantity of said predominantly starch ingredients.
- the extent to which the predominantly starch- containing ingredients are displaced is not prescribed as it will depend on the desired nature, form and nutritional composition of the extruded expanded product.
- Expanded food products have been manufactured containing 40% protein by incorporating enzyme-modified wheat gluten of this invention.
- the dry ingredient mix containing enzyme-modified wheat gluten of this invention is introduced into an extruder with or without pre-hydration according to the desired product and the capability' of the extruder it is introduced in the same manner as introduction of the dry mix not containing the protein-rich ingredient.
- extruder is operated with essentially the same screw configuration and with essentially the same operating conditions as for extrusion of a predominantly starch-containing ingredient mix not containing the enzyme modified wheat gluten of the present invention.
- the enzyme-modified wheat gluten of the present invention melts under pressure and shear at a temperature equivalent to that of starch then the enzyme-modified wheat gluten and starch melt together and form a near uniform plastic material that when expressed through a die and allowed to freely expand and cool forms a crisp expanded form equivalent to that produced when a predominantly' starch- containing mix is extruded and expanded.
- the configuration of the die is not prescribed nor is the resulting form of the extruded protein-enriched food.
- Novel expanded foods enriched with protein by incorporating enzyme-modified wheat gluten of the present invention can thus be made in a variety of shapes, sizes, forms and protein contents as is perceived to be desirable for consumers. Expanded foods of this type may be variously coloured and flavoured by addition of suitable colorants or flavorants prior to expansion or after the expanded food form is manufactured as is perceived to be desirable for consumers.
- Protein-enriched, sheeted (extruded in the form of a thin sheet) and fried or baked foods including potato-chip-like, corn-chip-like and tortilla-like products are manufactured by incorporating a quantity of enzyme-modified wheat gluten of the present invention into a mix of predominantly starch-containing ingredients as used in the manufacture of many less nutritious sheeted and fried or baked food types concomitantly displacing an equivalent quantity of said predominantly starch ingredients.
- the extent to which the predominantly starch- containing ingredients are displaced is not prescribed as it will depend on the desired nature, form and nutritional composition of the sheeted and fried or baked product.
- Sheeted and fried food products have been manufactured containing 30% protein by incorporating enzyme-modified wheat gluten of this invention.
- the dry ingredient mix containing enzyme-modified wheat gluten of this invention is formed into a dough by addition of water and use of a mixer.
- the said dough is introduced into a sheeter according to the desired product, and cut into shapes and fried or baked in the same manner as applied to a dough not containing the enzyme-modified wheat gluten ingredient of the present invention.
- the sheeter is operated in essentially the same configuration and with essentially the same operating conditions as for sheeting of a predominantly starch- containing ingredient mix not containing the enzyme-modified wheat gluten of the present invention.
- the enzyme-modified wheat gluten of the present invention has sufficient elasticity to assist the formation of a cohesive dough but is weak enough to allow sheeting without contraction, so subsequent cutting and shaping can be achieved as for compositions not containing the enzyme-modified wheat gluten of the present invention.
- the configuration of the sheeter is not prescribed nor is the resulting shape or form of the resulting protein-enriched food.
- the mode of cooking is not prescribed but baking or frying to cook the starch are both possible.
- Novel sheeted and cooked foods enriched with protein by incorporating enzyme- modified wheat gluten of the present invention can thus be made in a variety of shapes, sizes, forms, compositions and protein contents as is perceived to be desirable for consumers.
- Sheeted and cooked foods of this type may be variously coloured and flavoured by addition of suitable colorants or flavorants prior to sheeting and cooking or after the sheeted and cooked food form is manufactured as is perceived to be desirable for consumers.
- Figure 1 is a SDS-PAGE gel of wheat gluten and enzyme-modified wheat gluten products analysed relative to calibrant proteins of known molecular weight
- Figure 2 shows percentage of protein in each band relative to total protein in all bands in each lane for wheat gluten and enzyme-treated wheat gluten products; Lane assignment as in Figure 1
- Figure 3 shows band identification and molecular weight assignment for wheat gluten and enzyme-treated wheat gluten products; Lane assignment as in figure 1.
- Figure 4 shows Mass Spectrum of enzyme-modified wheat protein products identified as Sample 3 prepared as in Example 2 and Sample 6 prepared as in Example 5 showing overlapping regions of the Mass ranges 4982 to 7491 and 6244 to 9290 mass units
- Figure 5 shows Mass Spectrum of enzyme-modified wheat protein products identified as Sample 3 prepared as in Example 2 and Sample 6 prepared as in Example 5 showing overlapping regions of the Mass ranges 8753 tol0899 and 10477 to 13599 mass units
- Figure 6 shows Mass Spectrum of enzyme-modified wheat protein products identified as Sample 3 prepared as in Example 2 and Sample 6 prepared as in Example 5 showing overlapping regions of the Mass ranges 12736 tol9189 mass units
- Figure 7 shows Glass transition temperature and heat capacity determined by Differential Scanning Calorimetry for (i) wheat gluten and enzyme-modified wheat gluten products,(ii) Sample 3, ( ⁇ i) Sample 5 and (iv) Sample 6.
- Figure 8 shows Storage modulus and tan ⁇ values determined by Dynamic Mechanical Analysis obtained as a function of temperature for (#1) Wheat gluten, (#2) Sample 3 and (#3) Sample 5.
- Example 2 Preparation of enzyme-modified wheat gluten using the protease, Multifect Neutral Water at a temperature of 55°C was placed in a temperature-controlled vessel and stirred continuously. To this water Multifect Neutral (Genencor) was added sufficient to result in a concentration of 0.05% relative to the amount of dry vital gluten to be used. Dry vital wheat gluten was added over a five minute period to achieve a final mix of 30% solids (w/w). This mixture was stirred continuously at a temperature of 55°C for a period of two hours. After this time the temperature was rapidly increased to 80 0 C and after 2 minutes at 8O 0 C, the temperature was cooled to less than 50 0 C. The resulting enzyme-modified wheat gluten product was then freeze dried and identified herein as Sample 3. The product composition and Degree of Hydrolysis are shown in Table 2
- Example 3 Commercial production of enzyme-modified wheat gluten using the protease, Multifect Neutral
- Fresh, wet vital wheat gluten at about 40°C was obtained directly from a starch and gluten manufacturing plant
- the wet gluten together with continuous introduction of the appropriate quantity of Multifect Neutral, as in Example 2 was pumped through a continuous high shear mixer and into a steam jacketed stirred vessel to increase the temperature of the mix to 55°C.
- This mixture was stirred continuously at a temperature of 55°C for a period of two hours.
- the mixture was pumped through a tube-in-tube heat exchanger to increase the temperature to 80 0 C, then through a jacketed tube with 2 minute retention and then through a second tube-in-tube heat exchanger to cool the mix to about 50 0 C.
- the resulting enzyme-modified wheat gluten product at about 28% w/w solids was then dried through a ring drier by introducing the wet feed into the recycle blender and identified herein as Sample 4.
- the product composition and Degree of Hydrolysis are shown in Table 3
- Example 5 Preparation of enzyme-modified wheat gluten using the protease, Multifect Neutral Water at a temperature of 55 0 C was placed in a temperature-controlled vessel and stirred continuously. To this water, Multifect Neutral was added sufficient to result in a concentration of 0.5% relative to the amount of dry vital gluten to be used. Dr>- vital wheat gluten was added over a five minute period to achieve a final mix of 30% solids (w/w). This mixture was stirred continuously at a temperature of 55 D C for a period of two hours. After this time the temperature was rapidly increased to 80°C and after 2 minutes at 80 0 C, the temperature was cooled to less than 50 0 C. The resulting enzyme-modified wheat gluten product was then freeze dried and identified herein as Sample 6. The product composition and Degree of Hydrolysis are shown in Table 5
- Enzyme-modified wheat gluten samples prepared as in Examples 1 to 6 and with process variations to define and optimise the product and process were analysed by PAGE essentially according to the detailed method of Kasarda, Woodard and Adalsteins (1998) using reducing conditions.
- Samples for analysis were prepared by dispersing lOmg of sample in 1.OmL of sample buffer containing 2% SDS, 10% glycerol, 5OmM ditbiothreitol, 62.5mM Tris(hydroxymethyl) aminomethane-HCl and 0.05% bromophenol blue as marker dye at pH 8.5. Samples were heated to 8O 0 C for 5 minutes and analysed on a polyacrylamide gradient (4 to 12%) gel. 9 microL of each sample was layered onto the polyacrylamide gel and run at 120V for 90 minutes. Gels were stained in Coomassie Brilliant Blue R250 without trichloroacetic acid fixation and destained with 30% methanol overnight. Standard protein calibration mixture was run on each gel to enable molecular weights of protein fragments to be determined.
- Example 8 Characterisation of Enzyme-Modified Wheat Gluten products by estimation of Degree of Hydrolysis
- Enzyme-modified wheat gluten samples prepared as in Examples 1 to 6 and with process variations to define and optimise the product and process were analysed for Degree of Hydrolysis according to the detailed OPA method as described by Frisher et al. (1988).
- DH Degree of Hydrolysis
- ⁇ is the number of free amino groups measured in the enzyme-modified wheat gluten samples
- n is the number of amino groups in native gluten
- n ⁇ is the total number of amino groups in native gluten after total hydrolysis with 6M HCl for 24 hours.
- Table 8 shows that enzyme-modified wheat gluten products suited to extruded and expanded foods have been modified to a Degree of Hydrolysis within the range 2 - 3%. Such products having DOH below or above this range were not suited to such applications.
- Samples were prepared for analysis at about 7mg /mL by dispersing in 45% acetonitrile containing 0.1% formic acid.
- the matrix was lOmicrogram / mL of sinnapinic acid in 30% acetonitrile containing 0.1% formic acid.
- the sample to matrix ratio was 1:1.
- Samples were analyses in a Voyager STR mass spectrometer ( Applied Biosy stems) over a Mass /Charge( m/z) range from 4829 to 21927 mass units.
- Figures 4,5 and 6 show sequential and overlapping portions of the mass spectrum achieved for each of Samples 3 and 6. It is apparent that the peaks representing peptides of different mass/ charge ratio (m/z) can be categorised broadly into three Categories: (i) peaks substantially present in Sample 3 representing a product with low Degree of Hydrolysis but not significantly present in Sample 6 representing a product with a higher Degree of Hydrolysis, (ii) peaks approximately equivalently represented in Samples 3 and 6 and (iii) peaks substantially represented in Sample 6 but not significantly represented in Sample 3.
- mass spectrometry provides a more detailed and precise evaluation of the peptide entities resulting from enzyme modification of wheat gluten and can be taken as complimentary to the data provided by SDS-PAGE as in Example 7. While SDS-PAGE provides a direct "fingerprint" representation of the apparent molecular weights of the peptides present in a product sample, mass spectrometry identifies a sequence of peptides according to the mass/ charge ratio and consequently cannot be directly compared to results from SDS-PAGE since the charge value for each peak is not known.
- Enzyme-modified wheat gluten samples prepared as in Examples 1 to 6 and with ingredient and process variations to define and optimise the product and process were analysed by Differential Scanning Calorimetry (DSC) essentially according to John W Lawton and Y. Victor Wu (1993). Samples were measured as obtained on a differential scanning calorimeter PerkinElmer DSC Pyris 1. The measurement was made on 3-5 mg samples at a scan rate of 10 °C/min. The glass temperature (Tg) was recorded as the midpoint of the heat capacity change during the transition at the first scans. The results in Table 10 and Figure 7 show that enzyme-modification of wheat gluten resulted in significant decrease in glass transition temperature, Tg, and a significant corresponding decrease in heat capacity. Extensively modified wheat gluten, Sample 6, showed a high heat capacity and glass transition temperature indicative of greater molecular mobility resulting from greater protein fragmentation.
- Table 10 Physical properties of wheat gluten and enzyme-modified wheat gluten products determined by Differential Scanning Calorimetry
- Enzyme-modified wheat gluten samples prepared as in Examples 1 to 6 and with ingredient and process variations to define and optimise the product and process were analysed by Dynamic Mechanical Analysis (DMA) according to Zhang et al. (2006).
- DMA Dynamic Mechanical Analysis
- Samples were prepared as sheets with water (15%) as plasticiser and adjusting the pH to 4.0 with acetic acid. Each sample with a designed formulation was mixed with a high speed mixer for 1 minute and left overnight to equilibrate. The sample was then compression-moulded at 130°C for 5 minutes using a heating press with a pressure of 12 ton. The sample size was 145mm x 145mm with a thickness of lmm ⁇ 0. lmm. DMA testing was performed on samples after conditioning at 50% relative humidity using a Perkin-Elmer PYRIS Diamond DMA in dual cantilevers bending mode at a frequency of IHz. The temperature range was -100 to 150 0 C with a heating rate of 2 o C/min.
- Example 12 Application of Enzyme-Modified Wheat Gluten products in a formulated potato chip-type food
- Enzyme-modified wheat gluten samples prepared as in Examples 1 to 6 and with ingredient and process variations to define and optimise the product and process were analysed for sheeting properties and suitability for application in a cooked sheeted food as in a formulated potato chip-type food according to the formulations shown in Table 12 and the detailed method below.
- the composition of finished products is shown in Table 13
- Samples were prepared in a high shear mixer by first adding dry ingredients and mixing for 10 seconds. Water was then added and mixed for 30 seconds. Enzyme-modified wheat gluten was included in the range 0-20% w/w.
- the resulting dough was fed into a 3 roll sheeter with a roil diameter of 110mm, front roll speed of 6 rpm, back roll speed of 2 rpm and a roll gap of 0.65mm. Sheeted dough was cut into oval shaped pieces of approximately 8cm x 5 cm and fried in a batch fryer at 180°C for 15-20 seconds. Chip thickness was 0.55-0.80mm.
- Composition Standard product Product including enzyme-modified wheat gluten
- Table 14 shows that satisfactory sheeting behaviour was achieved at least up to 16% w/w inclusion of enzyme-modified wheat gluten in a potato chip-type food formulation with some advantage due to low level cohesion increasing with protein content.
- the pieces of the sheet when deep fried, cooked to an attractive appearance with colour intensity increasing with included protein content.
- the flavour at all levels of enzyme-modified wheat gluten was pleasant and typical of a deep fried potato chip-type food, however, a mild cereal flavour note increased with increasing protein content.
- Example 13 Application of Enzyme-Modified Wheat Gluten products in a formulated corn-based, tortilla-type food
- Enzyme-modified wheat gluten samples prepared as in Examples 1 to 6 and with ingredient and process variations to define and optimise the product and process were analysed for sheeting properties and suitability for application in a cooked sheeted food as in a corn-based tortilla-type food according to the formulation shown in Table 15 and the detailed method below.
- the compositions of finished products are shown in Table 16.
- Samples were prepared in a high shear mixer by first adding dry ingredients and mixing for 10 seconds. Water was then added and mixed for 30 seconds. Enzyme-modified wheat gluten was included in the range 0-20% w/vv. The resulting dough was fed into a 3 roll sheeter with a roll diameter of 110mm, front roll speed of 6 rpm, back roll speed of 2 rpm and a roll gap of 0.65mm. Sheeted dough was cut into oval shaped pieces of approximately 8cm x 5cm and fried in a batch fryer at 180°C for 15-20 seconds. Chip thickness was 0.55-0.80mm
- Composition Standard product Product including enzyme-modified wheat gluten
- Table 17 shows that satisfactory sheeting behaviour was achieved at least up to 16% w Av inclusion of enzyme-modified wheat gluten in a corn-based tortilla- type food formulation with some advantage due to low level cohesion increasing with protein content
- the pieces of the sheet when deep fried, cooked to an attractive appearance with colour intensity increasing with included protein content.
- the flavour at all levels of enzyme-modified wheat gluten was pleasant and typical of a deep fried corn-based tortilla-type food, however, a mild wheat flavour note increased with increasing protein content
- the fat uptake by the corn-based tortilla-type food decreased with increased protein content.
- Table 17 Processing and product quality assessment of corn-based tortilla- typ ⁇ product containing levels of enzyme-modified wheat gluten
- Example 14 Application of Enzyme-Modified Wheat Gluten products in an extruded, expanded food type of ready-to-eat products
- Enzyme-modified wheat gluten samples prepared as in Examples 1 to 6 and with ingredient and process variations to define and optimise the product and process were analysed for extrusion properties in an expanded, extruded food as in a breakfast cereal food or a snack food according to the formulations shown in Table 18 and the detailed method below. Compositions of finished products is shown in Table 19.
- Composition Standard product Product including enzyme-modified wheat gluten
- Table 20 Processing and product quality assessment of extruded, expanded cereal-based ready-to-eat products containing levels of enzyme- modified wheat gluten
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EP3398445A1 (en) * | 2017-05-03 | 2018-11-07 | Deria Rensinghoff | Meat substitute product and method for producing a meat substitute product |
US20190142029A1 (en) * | 2017-11-13 | 2019-05-16 | Manildra Milling Corporation | Clean label wheat protein isolate |
WO2019122376A1 (en) * | 2017-12-22 | 2019-06-27 | Tessenderlo Group Nv | Protein hydrolysate and process for making such |
CN110669814A (en) * | 2019-11-01 | 2020-01-10 | 中国农业大学 | Wheat protein peptide with blood pressure lowering activity and preparation method thereof |
CN114680226A (en) * | 2022-01-07 | 2022-07-01 | 西北农林科技大学 | Treatment method and application of mucedin |
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JP2004248654A (en) * | 2003-02-21 | 2004-09-09 | Glyco Eiyou Shokuhin Kk | Food material obtained by restrictively making protease act on wheat protein |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3398445A1 (en) * | 2017-05-03 | 2018-11-07 | Deria Rensinghoff | Meat substitute product and method for producing a meat substitute product |
DE102017109419A1 (en) * | 2017-05-03 | 2018-11-08 | Simon Entemeier | Process for producing a meat substitute product and meat substitute product |
EP4316263A3 (en) * | 2017-05-03 | 2024-04-24 | Novel Vegan Crafts GmbH & Co. KG | Method for producing a meat substitute product and meat substitute product |
US20190142029A1 (en) * | 2017-11-13 | 2019-05-16 | Manildra Milling Corporation | Clean label wheat protein isolate |
WO2019122376A1 (en) * | 2017-12-22 | 2019-06-27 | Tessenderlo Group Nv | Protein hydrolysate and process for making such |
CN110669814A (en) * | 2019-11-01 | 2020-01-10 | 中国农业大学 | Wheat protein peptide with blood pressure lowering activity and preparation method thereof |
CN110669814B (en) * | 2019-11-01 | 2021-04-06 | 中国农业大学 | Wheat protein peptide with blood pressure lowering activity and preparation method thereof |
CN114680226A (en) * | 2022-01-07 | 2022-07-01 | 西北农林科技大学 | Treatment method and application of mucedin |
CN114680226B (en) * | 2022-01-07 | 2023-10-24 | 西北农林科技大学 | Gluten protein treatment method and application |
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