The research and development and application of modified starch in China have shown a good momentum of rapid development in the past 10 years. Especially since China's accession to the WTO, with the further opening up of the market, modified starch has been used in food, paper, textile, feed, medicine, construction, and environmental protection. The field is more widely used. At the same time, the diversified demands of the market have also led to a variety of new trends in the development of modified starch. The production process and application development of various chemically degraded starches for direct pre-gelatinization and compound denaturation is a good method that is worthy of being popularized and meets the requirements of China's new industrialization situation. .
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According to the technical characteristics of the chemical modification process, the state of the product after the reaction is also different. We use two different types of roller dryers in practical applications: single-roller dryers and double-roller dryers. The preconditions and products of the two process equipments are different, but through reasonable selection, the product quality can be greatly improved, and the process characteristics of different chemically modified products can be adapted to the maximum.
In recent years, we have conducted continuous research and exploration in the production method of roller modified composite modified starch and how to improve product quality, and summed up some experiences and experiences.
1.1 Production operation
1.1.1 In general, chemically modified starch milk is washed, concentrated and dehydrated before rehydration, instead of chemically degraded slurry going directly to the drum for drying. Because the washed starch can be dehydrated, it can become a more pure product, so as to obtain high quality compound modified starch.
1.1.2 According to different product requirements, carefully adjust the operating parameters of the roller drying.
The control of pressure, temperature and rotation speed is generally optimized and adjusted according to the moisture content and color of the final product and the ease of gelatinization. At present, there are three conventional products: φ500, φ1000, and φ1500. The speed adjustment range is 0~6r/min and the working pressure is ≤0.8Mpa. Due to adopting electromagnetic speed regulation and frequency conversion speed regulation, it can better meet the production operation of compound modified starch. It is worth pointing out that for high-viscosity products, the electromagnetic speed regulation method should generally be selected, and its overload capacity is strong enough to solve the problem of large starting resistance.
1.2 Product Quality Control
It is not difficult to see from the production process of compound modified starch that there are many factors that affect product quality, both the internal factors of the quality of the production raw materials, and the external factors that control the process parameters. Under the premise of ensuring the quality of production raw materials, the quality control of products mainly focuses on the following aspects.
1.2.1 Strengthen the follow-up inspection, grasp the reaction progress and gelatinization effect in time, and strive to ensure the stability of product quality;
1.2.2, optimize the drying equipment production process, according to the characteristics of different products, a reasonable choice of roller dryer type, to meet the production needs of different products;
1.2.3 Complete quality control system and improve rules and regulations.
2 Application Prospects of Compound Modified Starch
Compound modified starch is widely used for its excellent performance (cold water soluble, easy to transport, energy saving and environmental protection). Although the current application field is very wide, the volume of a single product is not large, and it is necessary for the entire industry to work together to promote the application. The current main application areas include:
2.1, powder (grainy) food and beverage, spices in the application.
At present, powder (grain) foods are used for mixed packaging, and the end user directly flushs water for drinking. This is also the application method in solid seasonings.
2.2. In the forming process of cakes, cakes, and sheet-like foods, the composite modified starch is used as a curing excipient, swelling agent, and improver. Currently in snow rice cakes, compound potato chips, cake pie and other products are more common; 2.3, in frozen food applications. Compound modified starch has cold water soluble and can be more convenient to produce;
2.3, in the paper tube and paper industry applications. Currently widely used at home and abroad;
2.4, the application of environmental protection coatings. As people pursue environmental protection materials, the promotion and development of the compound modified starch industry is very rapid.