Method for producing slow digestion starch by hot-press acid-hydrolysis of cornstarch using organic acid

Abstract

The invention relates to a method for adopting organic acid to treat common corn starch through autoclaving and acid hydrolysis so as to prepare the slow digestible starch. The method includes the following steps: the common corn starch is prepared with the organic acid of 0.1 to 10 percent (w / v) concentration into a corn starch cream of 2 to 30 percent (w / v) concentration; the obtained corn starch cream is stirred for 20 to 60 minutes and then is treated through acid hydrolysis and autoclaving for 5 to 90 minutes under the temperature of 100 to 150 DEG C; then the corn starch cream is centrifuged at a speed of 2000 to 10000rpm for 2 to 10 minutes; the sediment of centrifugation is frozen for retrogradation under the temperature of minus 10 to 10 DEG C for 12 to 240 hours and then the sediment is dried with blast under the temperature of 50 to 80 DEG C for 10 to 20 hours; and then after the mechanical smashing, the sediment is sifted with a mesh sieve of 80 to 150 meshes so as to obtain the product containing more than 20 percent of slow digestible starch. The slow digestible starch prepared by the invention can be applied to the food manufacturing industry.

Description

technical field [0001] The invention belongs to the field of modified starch processing, and in particular relates to a method for producing slowly digestible starch by using organic acid, pressurization, and heat to acidolyze common corn starch. Background technique [0002] Starch is a very important food source of energy. Englyst divides starch into three categories according to its bioavailability, including Rapidly Digestible Starch (RDS), which can be digested by α-amylase in the small intestine within 20 minutes. Starch; slowly digestible starch (Slowly Digestible Starch, SDS), starch that can be digested by α-amylase in the small intestine within 20 to 120 minutes; resistant starch (Resistant Starch, RS), which cannot be digested by α-amylase in the small intestine after 120 minutes Digested starch. [0003] SDS has a variety of physiological functions: ①SDS stays in the gastrointestinal tract for a long time, releases glucose slowly, and the glucose produced can re...

AI Technical Summary

Problems solved by technology

The physical method mainly uses microwave heating to treat starch, but this method is not suitable for large-scale industrial production and requires high production costs; enzymatic methods generally use pullulanase, isoamylase, etc. to enzymatically hydrolyze gelatinized starch , to obtain SDS through molecular modification technology, but the enzymes used in this method are high-cost enzymes, especially isoamylase, which are currently only used for laboratory sample preparation, and it will take a certain amount of time to be put into industrial production; according to literature reports The chemical reagents selected by the chemical method are toxic substances such as phosphorus oxychloride, octenyl succinic acid, and propylene oxide. Although the process is relatively simple, the prepared SDS has certain toxicity and cannot be applied to the field of food processing; However, the combination of physical and enzymatic methods to prepare SDS requires higher production costs than individual enzymatic methods, so it is unrealistic for industrial production.

On the other hand, the raw materials for the preparation of SDS are basically waxy corn starch, but the source of this raw material is not extensive.