Modified Starch

On the basis of the inherent characteristics of natural starch, in order to improve the properties of starch and expand its application range, physical, chemical or enzymatic treatment is used to introduce new functional groups on starch molecules or change the size of starch molecules and the properties of starch granules. Thereby changing the natural characteristics of starch (such as: gelatinization temperature, thermal viscosity and its stability, freeze-thaw stability, gel strength, film-forming, transparency, etc.), making it more suitable for certain application requirements. This starch that has undergone secondary processing and changed its properties is collectively referred to as Modified Starch.

As one of the important raw and auxiliary materials in industry, modified starch can be widely used in papermaking, food, textile, construction, medicine and other industries. The production enterprises shall actively develop new products and expand the application fields of modified starch.

1. Denatured starch for food should be functional, diverse and convenient. New varieties should be developed in grain processing, focusing on the development of corn series products and potato starch, modified starch and derivative products; We will develop convenience food, nutrition and health food, and emulsifying thickening quality improvers. Therefore, modified starch for food can be developed into functional modified starch, modified starch for convenience food and alkenyl succinate starch which is in short supply in China. As a food additive, denatured starch should take into account the increasing trend of hypertension and hyperlipidemia patients in China, develop fat substitutes and sugar substitutes that have energy and nutritional value and do not affect blood sugar, so as to meet the needs of increasing incidence rate of diabetes patients year by year. At present, fat substitutes based on starch can be used in almost all foods that need to add fat; The developed anti digestible starch has low water holding capacity, fine particles, fresh flavor, and the microcrystalline structure is smaller than that of ordinary dietary fiber. It can also be used as a functional component in a variety of foods.

2. The development speed of denatured starch that is 100% substituted for chemical size Pva also needs to be accelerated. The modified starch used for textile sizing is mainly acid hydrolyzed starch, oxidized starch, urea starch, phosphate starch, and a small amount of acetate starch and compound modified starch. These varieties are difficult to replace the chemical size PVA, especially in the sizing of high branch yarn products. Due to its non degradability, PVA is gradually used or even not used in textile sizing materials. Similar products have been put on the market abroad. It is believed that with the efforts of people in the domestic denatured starch industry, this product can be fully developed.

3. The development of new surface coating agents and sizing in the paper industry is beneficial to meet the needs of the product structure of the national paper industry. Denatured starch is an important papermaking chemical. The amount of denatured starch used in papermaking in China is 1 / 3 of the total amount of denatured starch in the country, but the variety is single and the level is low. At present, the product structure of the national paper industry is to develop towards high-grade newsprint, book printing paper, information paper, office paper and other medium and high-grade domestic paper, which requires the development of new surface coating agents and sizing agents to meet the needs of the paper industry.

4. Starch based water absorbent is widely used. Water absorbent can be used in agriculture, forestry, horticulture, medicine and health, textile, papermaking, oil drilling, construction, wastewater treatment and food processing. At present, some industries rely on a large number of imported expensive water absorbent products to meet the market demand, and most of the imported products are polymer synthetic products. With the depletion of oil and increasing attention to environmental protection, the market of this kind of products is facing a crisis. The development direction of this product is to use renewable natural starch resources to undergo graft copolymerization with acrylic acid or acrylonitrile through chemical treatment, and connect hydrophilic macromolecules on the starch to prepare biodegradable water absorbent to replace the water absorbent re synthesized by petroleum refining.

In a word, with the growth of China's economy, the continuous expansion of the scale of industrial products, the continuous development of the application field of modified starch, the continuous development of new products and the continuous innovation of new processes, the demand for modified starch will also increase; In addition, with the gradual reduction of natural oil, the modified starch produced from renewable resources is a substitute for many petrochemical products, which brings development space for modified starch. Therefore, the development prospect of modified starch will be very broad.