Preparation method of potato carboxymethyl starch

Abstract

The invention relates to a preparation method of modified starch, in particular to a preparation method of potato carboxymethyl starch, and the method comprises the following steps: native potato starch and ethanol solution are mixed, thus forming slurry, and then sodium hydroxide is added and alkalization reaction is carried out, thus obtaining alkalized liquid; chloroacetic acid and the sodium hydroxide are added into the obtained alkalized liquid, after stirring and dispersing well, etherification reaction is carried out under the condition of microwave, thus obtaining etherified liquid; the obtained etherified liquid is neutralized by glacial acetic acid, and after filtering, the filter cake is washed by the ethanol solution, and then is dried and grinded, thus obtaining the potato carboxymethyl starch; the method can prepare the potato carboxymethyl starch simply and rapidly, the production cost is low, and the method is suitable for industrialized production.

Description

technical field The invention relates to a preparation method of modified starch, in particular to a preparation method of potato carboxymethyl starch. Background technique Potato starch is processed from potatoes. Compared with other starches (such as corn starch, sweet potato starch, wheat starch, etc.), potato starch has many characteristics in physical properties, mainly manifested in large starch granules, high amylopectin content, easy gelatinization, good paste transparency and viscosity High, not easy to aging, etc., it has been widely used in food, medicine, textile, papermaking, casting, construction, agriculture, chemical industry, petroleum and so on. However, there are still many deficiencies in the processing of raw potato starch, such as poor solubility in cold water, poor thermal stability of paste, poor film-forming properties, etc., which make its direct application in industry subject to many restrictions. In order to overcome the shortcomings of potato ...

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Problems solved by technology

Among them, the water-based method can only produce products with a low degree of substitution (DS) and viscosity, and the post-processing of the product is difficult and consumes a lot of water, so it is rarely used in industry at present; Products with relatively uniform distribution, but the preparation time is long and the production cost is high; due to the difficulty in mixing the starch and the reaction reagents uniformly, the alkali and etherifying agents are difficult to penetrate into the interior of the starch granules, so only a low degree of substitution can be obtained. Products with uneven distribution of substituents

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