Modified starch

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Pack of modified food starch, a food additive which is prepared by treating starch or starch granules. Modified food starch.JPG
Pack of modified food starch, a food additive which is prepared by treating starch or starch granules.

Modified starch, also called starch derivatives , is prepared by physically, enzymatically, or chemically treating native starch to change its properties. [1] Modified starches are used in practically all starch applications, such as in food products as a thickening agent, stabilizer or emulsifier; in pharmaceuticals as a disintegrant; or as binder in coated paper. They are also used in many other applications. [2]

Contents

Starches are modified to enhance their performance in different applications. Starches may be modified to increase their stability against excessive heat, acid, shear, time, cooling, or freezing, to change their texture, to decrease or increase their viscosity, to lengthen or shorten gelatinization time or to increase their visco-stability.

Modification methods

starch acetate Starkeacetat.png
starch acetate
hydroxypropylated starch Hydroxypropylstarke.png
hydroxypropylated starch
cationic starch Kationische Starke.png
cationic starch
carboxymethylated starch Carboxymethylstarke.png
carboxymethylated starch

An ancient way of modifying starch is malting grain, which humans have done for thousands of years. The plant's own enzymes modify the grain's starches. The effects can be modulated by varying the duration and the ambient conditions of the process. However, malting alone is not a limitless or optimized tool for every desirable end product. In recent centuries humans have expanded their repertoire of starch-modifying methods by learning how to use simple substances such as acids, alkalis, and enzymes from nature to modify starches in tailored ways.

Acid-treated starch (INS 1401), [3] also called thin boiling starch, is prepared by treating starch or starch granules with inorganic acids, e.g. hydrochloric acid (equivalent to stomach acid), breaking down the starch molecule and thus reducing the viscosity.

Other treatments producing modified starch (with different INS and E-numbers) are:

and combined modifications such as

Modified starch may also be a cold-water-soluble, pregelatinized or instant starch which thickens and gels without heat, or a cook-up starch which must be cooked like regular starch. Drying methods to make starches cold-water-soluble are extrusion, drum drying, spray drying or dextrinization.

Other starch derivatives, the starch sugars, like glucose, high fructose syrup, glucose syrups, maltodextrins, starch degraded with amylase enzyme are mainly sold as liquid syrup to make a sweetener.

Examples of use and functionality of modified starch

Pre-gelatinized starch is used to thicken instant desserts, allowing the food to thicken with the addition of cold water or milk. Similarly, cheese sauce granules such as in Macaroni and Cheese, lasagna, or gravy granules may be thickened with boiling water without the product going lumpy. Commercial pizza toppings containing modified starch will thicken when heated in the oven, keeping them on top of the pizza, and then become runny when cooled.

A suitably modified starch is used as a fat substitute for low-fat versions of traditionally fatty foods, e.g. industrial milk-based desserts like yogurt or reduced-fat hard salami having about 1/3 the usual fat content. For the latter type of uses, it is an alternative to the product Olestra.

Modified starch is added to frozen products to prevent them from dripping when defrosted. Modified starch, bonded with phosphate, allows the starch to absorb more water and keeps the ingredients together. Modified starch acts as an emulsifier for French dressing by enveloping oil droplets and suspending them in the water. Acid-treated starch forms the shell of jelly beans. Oxidized starch increases the stickiness of batter.

Carboxymethylated starches are used as a wallpaper adhesive, as textile printing thickener, as tablet disintegrants and excipients in the pharmaceutical industry.

Cationic starch is used as wet end sizing agent in paper manufacturing.

Genetically modified starch

Modified starch should not be confused with genetically modified starch, which refers to starch from genetically engineered plants, such as those that have been genetically modified to produce novel fatty acids or carbohydrates which might not occur in the plant species being harvested. In Europe the term "Genetically Modified Organism" is used solely where "the genetic material has been altered in a way that does not occur naturally through fertilisation and/or natural recombination". [4] The modification in "genetically modified" refers to the genetic engineering of the plant DNA, whereas in the term "Modified Starch" seen on mandatory ingredient labels it refers to the later processing or treatment of the starch or starch granules.

Genetically modified starch is of interest in the manufacture of biodegradable polymers and noncellulose feedstock in the paper industry, as well as the creation of new food additives. For example, researchers aim to alter the enzymes within living plants to create starches with desirable modified properties, and thus eliminate the need for enzymatic processing after starch is extracted from the plant. [5]

See also

Related Research Articles

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Monostarch phosphate, E1410 in the E number scheme of food additives, is a modified starches. These are not absorbed intact by the gut, but are significantly hydrolysed by intestinal enzymes and then fermented by intestinal microbiota.

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Acetylated starch, E1420 in the E number scheme of food additives, is a modified starch. These are not absorbed intact by the gut, but are significantly hydrolysed by intestinal enzymes and then fermented by intestinal microbiota.

Hydroxypropyl starch is a type of modified starch used as a food additive. I has the E number E1440. Hydroxyl propyl starch is not absorbed intact by the gut, but are significantly hydrolyzed by intestinal enzymes and then fermented by intestinal microbiota.

References

  1. Vickie Vaclavik; Vickie A. Vaclavik; Elizabeth W. Christian (2007). Essentials of food science (3rd ed.). Springer. p. 61. ISBN   978-0-387-69939-4.
  2. Starch derivatization: fascinating and unique industrial opportunities, K. F. Gotlieb, A. Capelle, Wageningen Academic Publishers, 2005, ISBN   978-90-76998-60-2
  3. 1 2 3 4 5 6 7 8 "Codex General Standard for Food Additives (GSFA) Online Database" (PDF).
  4. "GMO". European food Standards Agency. 24 April 2013.
  5. Zeeman, Samuel C.; Kossmann, Jens; Smith, Alison M. (2 June 2010). "Starch: Its Metabolism, Evolution, and Biotechnological Modification in Plants". Annual Review of Plant Biology. 61 (1): 209–234. doi:10.1146/annurev-arplant-042809-112301. PMID   20192737 . Retrieved 16 July 2021.

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