Preparation method of low-viscosity octenyl succinic anhydride modified starch

Abstract

The invention relates to a preparation method of low-viscosity octenyl succinic anhydride modified starch. The method comprises the following steps of: (1) adjusting the pH value of a starch emulsion to 8.0-8.5, adding an H2O2 solution, adding a hydrochloric acid solution for neutralizing the starch emulsion till the pH value is 6.5-7.0, washing and drying to obtain low-viscosity oxidized starch; and (2) mixing the low-viscosity oxidized starch with distilled water to obtain a starch emulsion, continually stirring in a constant-temperature water bath, adjusting the pH value to 8.0-8.5, adding 2 mol / L of an MgSO4 solution which accounts for 1 percent of the weight of the starch emulsion, slowly adding octenyl succinic anhydride which accounts for 2-3 percent of the total mass of the low-viscosity oxidized starch obtained in the step (2), adjusting the pH value to 5.5-6.5, washing with water and ethanol respectively twice, and drying to obtain a white finished product. The product has the advantages of stable performance, simple and environmentally-friendly process steps, reduction in preparation time, no residue of oxidant and increase in production efficiency.

Description

technical field [0001] The invention belongs to the field of starch ester preparation, in particular to a preparation method of low-viscosity octenyl succinic acid starch ester. Background technique [0002] Low-viscosity starch octenyl succinate is a new type of composite modified starch. It has excellent emulsifying and dispersing properties due to its unique structural characteristics. It is widely used in non-alcoholic beverages, emulsifiers for baking and drug suspensions. The method for preparing low-viscosity starch octenyl succinate is mainly esterification degradation method, and the degradation methods include thermal degradation, sodium hypochlorite oxidation, acid degradation and enzymatic degradation, etc. The current production process of low-viscosity starch octenyl succinate is abroad It is relatively mature, mainly based on esterification and enzymatic hydrolysis process, which requires high equipment, glucoamylase or amylase hydrolysis process is complicate...

AI Technical Summary

Problems solved by technology

The method for preparing low-viscosity starch octenyl succinate is mainly esterification degradation method, and the degradation methods include thermal degradation, sodium hypochlorite oxidation, acid degradation and enzymatic degradation, etc. The current production process of low-viscosity starch octenyl succinate is abroad It is relatively mature, mainly based on esterification and enzymatic hydrolysis process, which requires high equipment, glucoamylase or amylase hydrolysis process is complicated and difficult to control, and it is difficult for domestic enterprises to master it. This is currently restricting the promotion of esterification and enzymatic hydrolysis process in China main factor

The main process for preparing low-viscosity starch octenyl succinate in China is the esterification acid hydrolysis method, which is simple and easy to control, but the small molecular dextrin in the acid hydrolysis process with concentrated hydrochloric acid will easily cause the product to turn yellow and become wet when wet. Agglomeration leads to poor performance of the product and is difficult to meet market needs. Moreover, sodium hypochlorite and sodium metabisulfite are used as oxidants in the prior art. Chloride ions have been participating in the reaction during the preparation process, resulting in impure product concentration and poor product stability.