Pre-gelatinized starch, also known as alpha-starch, is a cold-water-soluble modified starch formed by disrupting the crystalline structure of starch granules through physical or chemical means. Classified as a starch derivative, its gelatinization process comprises three distinct stages: reversible water absorption, irreversible water absorption, and starch disintegration. Industrial production primarily employs roller drying, spray drying, extrusion, and microwave methods. Among these, the roller method offers continuous production capabilities, though its gelatinization rate is approximately 80%; the spray method entails relatively high energy consumption; the extrusion method features lower equipment costs and yields products with lower viscosity; while the microwave method achieves both gelatinization and drying through microwave heating.
Due to its rapid solubility in cold water, this starch is widely utilized in the food industry-specifically for enhancing moisture retention and texture in baked goods, preventing cracking and providing thickening in frozen foods, stabilizing and thickening sauces, and facilitating rapid dissolution in instant foods. In the pharmaceutical sector, it serves as a tablet binder, replacing traditional excipients to enhance tablet structural integrity while minimizing potential side effects. Industrially, it is applied in foundry sand binding, textile sizing, and water-based architectural coatings; in the cosmetics industry, it serves as a substitute for talc in the production of skin-friendly body powders. The quality of the final product is influenced by various factors, including the type of raw material used, the concentration of the starch slurry, and the drying temperature.
