Method for producing high-viscosity and high-degree-of-substitution carboxymethyl cassava starch by utilizing ultrahigh-pressure blasting technique

Abstract

The invention discloses a method for producing high-viscosity and high-degree-of-substitution carboxymethyl cassava starch by utilizing an ultrahigh-pressure blasting technique. The method comprises the steps such as alkaline treatment, etherification reaction and purification. The method is carried out by primarily achieving the purpose of destroying a crystallization region of cassava starch particles by utilizing sodium hydroxide, sufficiently swelling and alkalifying starch molecules and loosening starch particles under the ultrahigh pressure of a high-pressure homogenizer, so that the hydroxyl of the starch becomes negative oxygen ions and the nucleophilic ability is strengthened, and simultaneously generating an St-O-Na<+> active center, then, preparing the high-viscosity and high-degree-of-substitution carboxymethyl cassava starch through the bimolecular nucleophilic substitution between sodium carboxymethyl starch obtained by alkalifying the starch and chloroacetic acid under the alkaline condition of sodium hydroxide. By utilizing the high-degree destructive effect of the ultrahigh-pressure blasting technique on a crystallization structure of the cassava starch, the technical problems such as degradation of the starch particles in a production process of the high-viscosity and high-degree-of-substitution carboxymethyl cassava starch are solved.

Description

technical field [0001] The invention belongs to the field of biochemical industry and relates to starch modification technology, in particular to a method for producing carboxymethyl cassava starch with high viscosity and high degree of substitution by using ultra-high pressure blasting technology. Background technique [0002] Carboxymethylstarchsodium (CMS) is a representative product of modified starch. After carboxymethylation of starch, the carboxymethyl starch ether structure is formed on the hydroxyl group of glucose due to the introduction of carboxymethyl groups. It is a water-soluble anionic macromolecular compound, and its physical and chemical properties are similar to those of carboxymethyl cellulose ( CMC) is similar, also known as modified sodium carboxymethyl starch or sodium starch acetate. CMS is generally non-toxic and odorless white or light yellow powder, odorless, tasteless, non-toxic, heat and easy to absorb moisture. Soluble in water to form a collo...

AI Technical Summary

Problems solved by technology

[0004] One is that the obtained product has large and uneven particles, and its performance indicators such as degree of substitution and viscosity are not high and unstable, and the alkalization process is not thorough and perfect, which seriously affects the use effect of the product

[0005] The second is that the traditional process puts the alkali into the solvent at one time. As a result, the dissolution rate is very slow and the distribution is uneven, which seriously affects the alkalization effect of starch, and then affects the etherification effect, and finally cannot obtain high substitution degree. products, and the salt resistance and acid resistance of the product do not meet the requirements of application performance indicators

[0006] The third is that the traditional method for preparing starch carboxymethyl starch sodium is very prone to local reactions, resulting in incomplete etherification, low conversion rate, and increased side reactions, resulting in uneven substitution degrees of products, low substitution degrees, and low production efficiency.

No corresponding downstream production line has been developed. There are few reports on the process of synthesizing carboxymethyl starch from cassava starch.