Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
  • C08B30/00—Preparation of starch, degraded or non-chemically modified starch, amylose, or amylopectin
  • C08B30/12—Degraded, destructured or non-chemically modified starch, e.g. mechanically, enzymatically or by irradiation; Bleaching of starch
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
  • A23L29/00—Foods or foodstuffs containing additives; Preparation or treatment thereof
  • A23L29/20—Foods or foodstuffs containing additives; Preparation or treatment thereof containing gelling or thickening agents
  • A23L29/206—Foods or foodstuffs containing additives; Preparation or treatment thereof containing gelling or thickening agents of vegetable origin
  • A23L29/212—Starch; Modified starch; Starch derivatives, e.g. esters or ethers
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
  • A23L29/00—Foods or foodstuffs containing additives; Preparation or treatment thereof
  • A23L29/20—Foods or foodstuffs containing additives; Preparation or treatment thereof containing gelling or thickening agents
  • A23L29/206—Foods or foodstuffs containing additives; Preparation or treatment thereof containing gelling or thickening agents of vegetable origin
  • A23L29/212—Starch; Modified starch; Starch derivatives, e.g. esters or ethers
  • A23L29/219—Chemically modified starch; Reaction or complexation products of starch with other chemicals
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
  • A23L29/00—Foods or foodstuffs containing additives; Preparation or treatment thereof
  • A23L29/30—Foods or foodstuffs containing additives; Preparation or treatment thereof containing carbohydrate syrups; containing sugars; containing sugar alcohols, e.g. xylitol; containing starch hydrolysates, e.g. dextrin
  • A23L29/35—Degradation products of starch, e.g. hydrolysates, dextrins; Enzymatically modified starches
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
  • A23L5/00—Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
  • A23L5/20—Removal of unwanted matter, e.g. deodorisation or detoxification
  • A23L5/25—Removal of unwanted matter, e.g. deodorisation or detoxification using enzymes
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
  • A23L5/00—Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
  • A23L5/40—Colouring or decolouring of foods
  • A23L5/49—Removing colour by chemical reaction, e.g. bleaching
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
  • C08B30/00—Preparation of starch, degraded or non-chemically modified starch, amylose, or amylopectin
  • C08B30/04—Extraction or purification
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
  • C08B30/00—Preparation of starch, degraded or non-chemically modified starch, amylose, or amylopectin
  • C08B30/12—Degraded, destructured or non-chemically modified starch, e.g. mechanically, enzymatically or by irradiation; Bleaching of starch
  • C08B30/14—Cold water dispersible or pregelatinised starch
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
  • C08B30/00—Preparation of starch, degraded or non-chemically modified starch, amylose, or amylopectin
  • C08B30/12—Degraded, destructured or non-chemically modified starch, e.g. mechanically, enzymatically or by irradiation; Bleaching of starch
  • C08B30/18—Dextrin, e.g. yellow canari, white dextrin, amylodextrin or maltodextrin; Methods of depolymerisation, e.g. by irradiation or mechanically
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
  • C08B31/00—Preparation of derivatives of starch
  • C08B31/003—Crosslinking of starch
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
  • C08L3/04—Starch derivatives, e.g. crosslinked derivatives
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
  • A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs

Definitions

• the present invention provides a process for preparing an inhibited starch.
• the present invention a!so provides an inhibited starch obtainable by the process according to the present invention, a use of the inhibited starch for the preparation of a food product and a food product comprising the inhibited starch.
• Starch is a very important ingredient in the food industry, for example as a thickening agent or stabiliser. Natural, unmodified starches (known as "native" starches) have a number of disadvantages when used in such applications.
• the thickening properties of starch are the result of the hydration and swelling of starch granules when an aqueous starch suspension is heated, which causes the viscosity of the starch suspension to increase.
• the swollen, hydrated granules are not stable, and are thus liable to bursting. Accordingly, after an initial peak in viscosity, the viscosity of native starch suspensions quickly decreases again. This is particularly the case in the presence of shear and/or under acidic conditions. in most food applications, it is undesirable for the viscosity of a thickened product to decrease again after reaching an initial peak.
• Stabilised starches can be produced very successfully by using chemical cross-linking reagents such as phosphorus oxychloride, sodium trimetaphosphate and epichlorohydrin. Stabilised starches produced in this manner are generally referred to as "chemically-modified starches”. These chemically-modified starches are able to offer the required properties in terms of viscosity stability, shear tolerance and acid tolerance.
• alkaline dry roasting (“thermally inhibited starch”).
• alkaline dry roasting methods can be found in EP0721471 B1 and in living Martin, “Crosslinking of Starch by Alkaline Roasting", Journal of Applied Polymer Science, vol. II, 1967, pages 1283-1288.
• the present invention provides a process for preparing an inhibited starch comprising, in order: a) extracting starch from a native source and partially refining to provide a partially refined starch having a residua! protein content on a dry starch basis of more than 0.4 % by weight and less than 8.0 % by weight; b) treating said partially refined starch with a bleaching agent to provide an inhibited starch; and c) recovering said inhibited starch.
• the process further comprises, after said bleaching b): b') treating the inhibited starch with a protease to remove residua! protein.
• the residual protein content on a dry starch basis of the partially refined starch is more than 1.0 % by weight. In a further preferred embodiment, the residual protein content on a dry starch basis of the partially refined starch is less than 4.0 % by weight. In a particularly preferred embodiment, the residual protein content on a dry starch basis of the partially refined starch is more than 1.2 % by weight and less than 3.0 % by weight, or more than 1.3 % by weight and less than 2.5 % by weight. According to an embodiment, the partially refined starch having a residual protein content on a dry starch basis of more than 0.4 % by weight and less than 8.0 % by weight is obtained by mixing two or more starch streams of differing residual protein contents. For example, a partially refined starch stream is mixed with a refined starch stream.
• the native source is waxy.
• the native source is selected from the group consisting of waxy maize (corn), waxy rice, waxy wheat, waxy sorghum, waxy barley and waxy potato. More preferably, the native source is waxy maize (corn).
• the bleaching agent preferably comprises a source of active chlorine.
• the bleaching agent comprises hypochlorite, for example an alkali metal or alkaline earth metal hypochlorite.
• the hypochlorite is sodium hypochlorite.
• the present invention provides an inhibited starch obtainable by the process according to the first aspect.
• the present invention provides the use of an inhibited starch according to the second aspect for the preparation of a food product, fn a preferred embodiment, the food product is an acidic food product.
• the present invention provides a food product comprising an inhibited starch according to the second aspect, i.e. comprising an inhibited starch obtainable, or obtained, by the process of the present invention.
• the food product is an acidic food product.
• Figure 1 shows the viscosity profiles for inhibited starch produced according to Example 1 (a), protease-treated inhibited starch produced according to Example 1 (b), starch produced according to the Comparative Example, and native waxy starch at pH 6.5.
• Figure 2 shows the viscosity profiles for inhibited starch produced according to Example 1 (a), protease-treated inhibited starch produced according to Example 1 (b), and starch produced according to the Comparative Example at pH 3.5.
• Figure 3 shows the viscosity profiles for inhibited starch produced according to Example 2(a) and protease-treated inhibited starch produced according to Example 2(b) at pH 6.5.
• Figure 4 shows the viscosity profiles for inhibited starch produced according to Example 2(a) and protease-treated inhibited starch produced according to Example 2(b) at pH 3.5.
• the present invention provides a process for preparing an inhibited starch comprising, in order: a) extracting starch from a native source and partially refining to provide a partially refined starch having a residual protein content on a dry starch basis of more than 0.4 % by weight and less than 8.0 % by weight; b) treating said partially refined starch with a bleaching agent to provide an inhibited starch; and c) recovering said inhibited starch.
• Native starch is recovered from native sources (cereals, vegetables and the like) by well-known processes such as wet-milling. These processes extract starch from a native source and then refine the starch to remove natural impurities such as proteins, lipids and other carbohydrates. The product of these processes is refined native starch, usually referred to simply as "native starch".
• the most commonly used native source is corn (maize).
• the process for recovering corn starch from corn is known as "wet-mil!ing".
• a typical wet-milling process has the following basic steps:
• Fine grinding and screening The remaining slurry leaves the separation step for fine grinding. After fine grinding, which releases the starch and gluten from the fibre, the slurry flows over fixed concave screens which catch the fibre but allow the starch and gluten to pass through. The starch-gluten suspension is then sent to starch separators; 5. Separating the starch and gluten - The starch-gluten suspension passes through a centrifuge where the gluten, which is less dense than starch, is easily spun out;
• Native starches refined by such processes typically have a very low level of residual protein of around 0.2 % by weight dsb ⁇ dry starch basis).
• starch is extracted from a native source and is then only partially refined, to provide a partially refined starch having a residual protein content on a dry starch basis of more than 0.4 % by weight and less than 8.0 % by weight.
• starch is removed from an extraction and refining process (such as wet-milling) at an intermediate point, at which the residual protein content remains at a level of more than 0.4 % by weight and less than 8.0 % by weight (dsb).
• starch may be removed from a wet-milling process (such as described above) before, or part way through, the washing step.
• the partially refined starch having a residual protein content on a dry starch basis of more than 0.4 % by weight and less than 8.0 % by weight may be obtained by combining two or more starch streams of differing residual protein contents, for example starch streams extracted from different stages of a wet-milling process.
• a partially refined starch stream with a relatively high residual protein content may be combined with a refined starch stream (such as may be obtained, for example, as the final product of a wet-mill refining process) to provide a partially refined starch having a residual protein content on a dry starch basis of more than 0.4 % by weight and less than 8.0 % by weight.
• starch is extracted from a native source and is partially refined to provide a partially refined starch stream; and the partially refined starch stream is combined with a refined starch stream to provide the partially refined starch having a residual protein content on a dry starch basis of more than 0.4 % by weight and less than 8.0 % by weight.
• the level of remaining impurities present in the partially refined starch is described in terms of residual protein content, it will be recognised that partially refined starch having the specified residual protein content will usually also contain residual lipids, lactic acid, other carbohydrates and the like. However, it is convenient to refer to the level of residual impurities by reference only to the level of residual protein.
• the partially refined starch used in step (b) has only been subjected to extraction and refining steps, such as those described above.
• the partially refined starch used in step (b) has not been subjected to any additional chemical or enzymatic reaction steps.
• the partially refined starch used in step (b) has not been treated to convert, or partially convert, organoleptic impurities and/or precursors of organoleptic impurities into non- organoleptic impurities.
• the partially refined starch used in step (b) has not been treated with any reagent for hydrolysing and/or oxidatively degrading impurities such as organoleptic impurities and/or precursors of organoleptic impurities.
• the partially refined starch used in step (b) has not been treated with any reagent such as proteases, lipases, chlorine-free oxidants, alkaline solution, alkaline aqueous solution, and mixtures of these.
• the residual protein (and other impurities) present in the partially refined starch used in step (b) has not been chemically or enzymatically modified as described above. All of the residua! protein ⁇ and other impurities) present in the partially refined starch used in step (b) is naturally present and derived from the native source; no additional protein is added to the partially refined starch used in step (b).
• the partially refined starch used in step (b) has a residual protein content on a dry starch basis of more than 0.4 % by weight and less than 8.0 % by weight.
• a residual protein content of more than 0.4 % by weight (dsb) is significantly greater than the residual protein content found in fully refined native starch, which typically has a very low level of residual protein of around 0.2 % dsb.
• the residual protein content of the partially refined starch used in step (b) is more than 0.5 % by weight (dsb), more than 0.6 % by weight (dsb), more than 0.7 % by weight (dsb), more than 0.8 % by weight (dsb), more than 0.9 % by weight (dsb), or more than 1.0 % by weight (dsb). It is particularly preferred that the residual protein content of the partially refined starch used in step (b) be more than 1.0 % by weight (dsb).
• the residual protein content of the partially refined starch used in step (b) is less than 7.0 % by weight (dsb), less than 6.0 % by weight (dsb), less than 5.0 % by weight (dsb), or less than 4.0 % by weight (dsb).
• the residual protein content of the partially refined starch used in step (b) is more than 1.0 % by weight (dsb) and less than 4.0 % by weight (dsb), for example more than 1.0 % by weight (dsb) and less than 3.0 % by weight (dsb); more than 1.1 % by weight (dsb) and less than 3.5 % by weight (dsb); more than 1.2 % by weight (dsb) and less than 3.0 % by weight (dsb); or more than 1.3 % by weight (dsb) and less than 2.5 % by weight (dsb).
• protein content means the protein content as determined using the Kjeldahl method, or any equivalent method.
• a % nitrogen content by weight, dsb
• a conversion factor in order to calculate the % protein content (by weight, dsb).
• the conversion factor depends on the native source. In the case of corn (maize), the conversion factor is 6.25.
• the Kjeldahl method and relevant conversion factors are well known to those skilled in the art.
• Any native source can be used according to the present invention, including both waxy and non-waxy sources.
• suitable native sources include maize (corn), barley, wheat, tapioca, rice, sago, amaranth, sorghum, arrowroot, potato, sweet potato, pea, banana, waxy maize (corn), waxy barley, waxy wheat, waxy rice, waxy sorghum and waxy potato.
• Waxy sources are generally preferred.
• preferred sources include waxy maize (corn), waxy rice, waxy wheat, waxy sorghum, waxy barley and waxy potato.
• a particularly preferred source is waxy maize (corn).
• the bleaching agent used in step (b) of the process according to the present invention preferably comprises a source of active chlorine.
• hypochlorite such as alkali metal or alkaline earth metal hypochlorites.
• preferred hypochlorites include sodium, potassium, calcium and magnesium hypochlorites.
• Sodium hypochlorite is particularly preferred.
• hypochlorite is a particularly convenient source of active chlorine for use in the present invention
• other sources of active chlorine may also be contemplated. Examples of such other sources include reagents which are able to generate active chiorine in situ.
• Other suitable bleaching agents include alkali metal chlorites and chlorine dioxide.
• the present invention also encompasses the use of mixed bleaching agents, for example appropriate mixtures of any two or more of the bleaching agents exemplified above.
• the amount of bleaching agent to be used in step (b) will usually be selected such that it provides from around 0.25 to around 3 weight % of active chlorine, relative to the amount of partially refined starch, on a dry starch basis.
• the amount of bleaching agent to be used may be selected such that it provides from around 0.35 to around 2.5 weight %, around 0.45 to around 2.2 weight %, or around 0.5 to around 2 weight % of active chiorine, relative to the amount of partially refined starch, on a dry starch basis.
• the treatment of the partially refined starch with a bleaching agent is preferably carried out on an aqueous slurry of the partially refined starch.
• the aqueous slurry may be an aqueous slurry obtained directly from an intermediate point in the starch refining process, for example from one of the starch washing steps at the washing stage of a wet-mill process.
• the starch content of the aqueous slurry is not critical, but may be in the range of from about 10 weight % (dsb) to about 70 weight % (dsb), from about 20 weight % (dsb) to about 60 weight % (dsb), or from about 30 weight % (dsb) to about 50 weight % (dsb).
• a slurry containing around 40 weight % starch (dsb) is particularly suitable. It is preferable to adjust the pH of the slurry prior to the addition of bleaching agent, and to then maintain the pH during the treatment with the bleaching agent.
• the pH prior to the addition of any bleaching agent may be adjusted to about 7 to about 9, for example about 8.5, and the pH during the treatment with the bleaching agent may be maintained within a range of about 9 to about 10, for example about 9.5,
• the adjustment and maintenance of the pH may be achieved by addition of a suitable alkali.
• An aqueous solution of an alkali metal hydroxide such as sodium hydroxide may be used, for example.
• the temperature of the slurry during the treatment with a bleaching agent is preferably maintained in a range of from about 30 to about 50 °C, for example about 40°C.
• the treatment with a bleaching agent is preferably carried out for a period of time of from around 30 minutes to around 4 hours, for example from around 1 hour to around 3 hours, or around 1.5 hours.
• the pH of the slurry is preferably adjusted to around 8 using a suitable acid such as sulfuric acid. Residual bleaching agent is then preferably deactivated using a suitable reagent such as sodium metabisulfite.
• the inhibited starch can be recovered from the slurry. This may be achieved by filtering the slurry to obtain a starch cake, washing the starch cake with water, and then drying the wet cake. The drying may be carried out at a temperature of about 50 °C, for example overnight in an oven. Preferably, the temperature during the drying step does not significantly exceed about 50 °C. For example, a suitable maximum temperature may be around 70 °C, about 60 °C, or about 50 °C. Following drying, the dried starch cake may be pulverised and screened as required.
• the process further comprises treating the inhibited starch with a protease to remove residual protein remaining after the treatment with the bleaching agent.
• a protease treatment can significantly improve certain properties of the final, inhibited starch product.
• a protease treatment step may be used to improve the organoleptic properties of the final inhibited starch product, such as palatability, odour and colour.
• a protease treatment is included in the process of the present invention, it is essential that this be carried out after step (b), i.e. after the treatment with a bleaching agent.
• the starch content of the aqueous slurry to be used for the protease treatment may be the same as described above for the bleach treatment step.
• a slurry containing around 40 weight % starch (dsb) is particularly suitable.
• the enzyme for use in the protease treatment is preferably a food grade protease.
• An example of a suitable protease is A!calase (RT ) (Novozymes A S).
• RT Novozymes A S
• Other suitable proteases known to those skilled in the art may also be used.
• the protease treatment step is preferably carried out at a temperature of from about 45 °C to about 55 °C, for example at about 50 °C.
• the pH is preferably adjusted to about 8 prior to the addition of protease, and is maintained at that ievel during the protease treatment.
• the adjustment and maintenance of the pH may be achieved by addition of a suitable alkali.
• An aqueous solution of an alkali metal hydroxide such as sodium hydroxide may be used, for example.
• the treatment with a protease is preferably carried out for a period of time of from around 30 minutes to around 1.5 hours, for example for around 1 hour.
• the slurry temperature is preferably lowered, for example to about 30°C, and the pH is lowered in order to deactivate the protease.
• An appropriate pH for the deactivation is around 3, and an appropriate period of time for the deactivation reaction is around 30 minutes to around 1 hour, for example around 45 minutes.
• the inhibited starch may be recovered in the same manner as already described above.
• the protease-treated inhibited starch may be recovered by filtering the slurry to obtain a starch cake, washing the starch cake with water, and then drying the wet cake. The drying may be carried out at a temperature of about 50 °C, for example overnight in an oven.
• the temperature during the drying step does not significantly exceed about 50 °C.
• a suitable maximum temperature may be around 70 D C, about 60 °C, or about 50 °C.
• the dried starch cake may be pulverised and screened as required.
• the inhibited starch obtained according to the present invention exhibits an excellent degree of inhibition, as well as excellent shear and acid tolerance.
• the acid-tolerance of the inhibited starch obtained according to the present invention is particularly advantageous, and is significantly improved compared to that of prior art native starches (protein content prior to bleaching of around 0.2 wt% dsb) that have been subjected to a mild bleaching treatment.
• the inhibited starch prepared according to the present invention is particularly suitable for use in a wide range of food applications, especially food applications where acid and shear tolerance are required.
• Food products wherein the inhibited starches according to the present invention are useful include thermally-processed foods, acid foods, dry mixes, refrigerated foods, frozen foods, extruded foods, oven-prepared foods, stove top-cooked foods, microwaveable foods, full-fat or fat-reduced foods, and foods having a low water activity.
• Food products wherein the inhibited starches are particularly useful are foods requiring a thermal processing step such as pasteurization, retorting, or ultra high temperature (UHT) processing.
• UHT ultra high temperature
• the inhibited starches are particularly useful in food applications where stability is required through all processing temperatures including cooling, freezing and heating.
• the inhibited starches are also useful in food products where a traditionally crosslinked starch thickener, viscosifier, gelling agent, or extender is required or desirable. Based on processed food formulations, those skilled in the art may readily select the amount of inhibited starch required to provide the necessary thickness and gelling viscosity in the finished food product, as well as the desired texture. Typically, the starch is used in an amount of from about 0.1 to about 35%, for example from about 2 to about 6%, by weight, of the food product.
• the food products which may be improved by the use of the inhibited starches of the present invention are high acid foods (pH ⁇ 3.7) such as fruit-based pie fillings, baby foods, and the like; acid foods (pH 3.7-4.5) such as tomato-based products; low acid foods (pH >4.5) such as gravies, sauces, and soups; stove top-cooked foods such as sauces, gravies, and puddings; instant foods such as puddings; pourable and spoonable salad dressings; refrigerated foods such as dairy or imitation dairy products (e.g., yogurt, sour cream, and cheese); frozen foods such as frozen desserts and dinners; microwaveable foods such as frozen dinners; liquid products such as diet products and hospital foods; dry mixes for preparing baked goods, gravies, sauces, puddings, baby foods, hot cereals, and the like; and dry mixes for predusting foods prior to batter cooking and frying.
• the inhibited starches are also useful in preparing food ingredients such as encapsulated flavours and clouds.
• the Inhibited starches prepared in accordance with the present invention may also be used in various non-food end use applications where chemically modified (crossiinked) inhibited starches have conventionally been utilised, such as cosmetic and personal care products, paper, packaging, pharmaceutical formulations, adhesives, and the like.
• chemically modified (crossiinked) inhibited starches have conventionally been utilised, such as cosmetic and personal care products, paper, packaging, pharmaceutical formulations, adhesives, and the like.
• partially refined waxy corn starch slurry was obtained from one of the several starch -washing steps during the final separation of proteins.
• This partially refined starch slurry (581.5 g, 38% ds) had a higher protein content ⁇ 1.47 % (dry starch basis)) than the final (i.e. "native") starch (0.2% dsb).
• the slurry was transferred to a 1 L R8 flask. The contents were warmed to 40 °C using a water bath. The pH of the slurry was adjusted to 8.5 by dropwise addition of NaOH (4%w/w) solution. An 12.89% concentrated sodium hypochlorite solution (21.4 g, 1.25 % dsb active chlorine) was added dropwise to the pH adjusted slurry. The reaction pH was adjusted to 9.6 with the same NaOH solution and maintained at that pH throughout the reaction (1.75 h). After completion of the reaction, the slurry pH was adjusted to 8 using 35%w/w H 2 S0 4 , followed by the addition of sodium metabisuifite solution (0.2% dsb) to kill residua! bleach.
• the contents were stirred for 30 min. During the metabisuifite addition, the pH of the slurry dropped to pH 7.5. The total & free chlorine of the reaction mixture was tested with Pool & Spa tests strip and was less 1 ppm). The slurry was then filtered and the starch cake was washed with Dl water (500ml x2). The wet cake was dried in an oven at 50 °C overnight. The dried starch was pulverized using a coffee grinder and screened through a 100 mesh screen.
• a 38% starch slurry was prepared by adding a fully-refined native waxy corn starch (229.4 g, 91.1% ds) to Dl water (320.4 g). This fully refined starch had a protein content of 0.2% dsb.
• the slurry was transferred to a 1 L reaction vessel and warmed to 40 °C using a water bath.
• the slurry pH was initially adjusted to 8.5 with 1 N NaOH followed by a dropwise addition of a 13.8% w/w sodium hypochlorite solution (3.79 g, 0.25 % active chlorine based on dry starch) over a period of 3 min. During this step, the pH of the slurry increased from 8.5 to 9.2.
• the starch slurry was adjusted to pH 9.5 and maintained at that pH for a period of 1 h and 20 min with the aid of a pH controller. Finally, the slurry was neutralized with 1 N H 2 SOi and filtered using a Buchner funnel. The filtrate tested negative for free chlorine using Pool & Spa test strips.
• the starch cake was washed with 1 L Dl water and the cake was dried overnight in a forced air oven with the temperature set at 50 °C.
• the dried starch was pulverized with a Thomas mill and screened through
• Paste Viscosity Procedure A rapid visco-analyser (RVA) (Newport Scientific Pty. Ltd., Warnewood, Australia) was used to analyse paste viscosity of the samples at pH 6.5 & 3.5 buffer solutions. The RVA analysis was done using a 28 gram total sample size at 5% ds. Heating profiles and RPM are indicated in the figures. RVA pH 6.5 solution (Cat. No. 6654-5, RICCA Chemical Company, Arlington, Texas, USA) and the certified buffer pH 3.5 solution (Key Laboratory Services, 2363 Federal Drive, Decatur, IL) were used.
• Example 2 Colour Analysis: Example 2(a):
• partially refined waxy starch slurry was obtained from one of the several starch-washing steps during the final separation of proteins.
• This partially refined starch slurry (6349 g, 38.2% ds) had a higher protein content (1.56% dsb) when compared to purified waxy starch slurry (0.2% dsb).
• This slurry was transferred to a 6L RB flask. The contents were warmed to 40 °C using a water bath.
• the pH of the slurry was adjusted to 9.5 by dropwise addition of NaOH (4%w/w) solution.
• a 14.3% w/w concentrated bleach solution (332.5 g, 1.96 % dsb active chlorine) was added dropwise to the pH adjusted slurry.
• concentrated sulfuric acid solution (35% w/w) was added to maintain the reaction pH.
• the pH was maintained at 9.5 throughout the reaction (2 h) by addition of NaOH (4% w/w) solution using a pH controller. After 2 h, the slurry pH was adjusted to 8 using concentrated H 2 S0 4 (35% w/w) followed by the addition of sodium metabisulfite solution (0.2% dsb) to destroy the residual bleach. The contents were stirred for 30 min. During the metabisulfite addition, the pH of slurry dropped to pH 6.5. The slurry was filtered through a filter paper using a Buchner funnel under vacuum. The wet starch cake was washed with 2 volumes of Dl water. The wet cake was dried in an oven at 50° C overnight. The dried starch was pulverized using a Thomas Mill and screened through a 100 mesh screen.
• the bath temperature was lowered to 30 °C and the slurry pH was lowered to 3 using 2N HCI to deactivate the protease enzyme.
• the deactivation reaction time was 45 min.
• the slurry was filtered.
• the starch cake was washed with 1 volume of water.
• the wet cake was dried in an oven at 50° C overnight.
• the dried starch was pulverized using the coffee grinder and screened through a 100 mesh screen to afford the final starch product.

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