Equipment and method for preparing carboxymethylated rice bran polysaccharide

Abstract

The invention discloses equipment and method for preparing carboxymethylated rice bran polysaccharide, aiming at problems that the substitution degree of the rice bran polysaccharide carboxymethlation product is low and reaction speed is slow. The equipment comprises a reactor, a circulating pump, an ultrasonic generator, a temperature control device, an ultrasonic controller, a liquid feed inlet, a solid feed inlet and a discharge outlet; the method for preparing carboxymethylated rice bran polysaccharide comprises the following steps: adding rice bran polysaccharide into a NaOH solution, then adding chloroacetic acid, reacting under an ultrasonic condition, performing pressure-reduced distillation and ethanol precipitation, and finally drying in vacuum. Through the equipment, the reaction time is shortened, the carboxymethlation efficiency is improved, and compared with the traditional water bath condition, the reaction condition adopted in the method disclosed by the invention has the advantages that the product substitution degree is increased, the free radical can be better eliminated, and the antioxidation activity is enhanced; and the technological process is simple, scientific and reasonable, and the prepared product can be further developed as an anticancer drug and a health product.

Description

technical field [0001] The invention relates to a device and method for preparing carboxymethylated rice bran polysaccharide, in particular to a carboxymethylation reaction of rice bran polysaccharide under ultrasonic conditions, and belongs to the technical field of deep processing of rice bran. Background technique [0002] Rice bran is a by-product of brown rice whitening, with an annual output of more than 100 million tons in China. The polysaccharide contained in rice bran exists in the caryopsis layer of rice, and it is one of the main nutritional components that has yet to be further developed and widely used. Natural rice bran polysaccharide has many biological activities, but the activity is weak, so it needs to further improve and improve some aspects of its activity before it has application value. The commonly used polysaccharide molecular modification methods mainly include sulfation, carboxymethylation, carboxyethylation, acetylation, phosphorylation, benzoylat...

AI Technical Summary

Problems solved by technology

However, the current ultrasonic technology generally uses ultrasonic cleaners, ultrasonic reactors, etc. The reaction liquid is in a static state under ultrasonic conditions, and the energy absorbed is uneven. The distance from the ultrasonic generator will affect the local reaction effect, so it needs to be developed. Develop a device that efficiently utilizes ultrasonic energy to achieve the purpose of saving energy and fully responding

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