Degreasing method for low-ester pectin

Abstract

The invention discloses a degreasing method for low-ester pectin. According to the degreasing method, pectinase directly acts on a high-ester pectin concentrated solution, so that dosage of pectinase is reduced greatly; by controlling temperature of the concentrated solution, the activity of pectinase is kept, and pectinase plays the role of degreasing; and after degreasing, precipitation is carried out quickly, so that production efficiency is improved greatly, and the production cost is reduced. The degreasing method has the advantages of high extraction efficiency, high production efficiency, high product quality and simple process, and is very suitable for scale production and industrial production. The low-ester pectin production process provided by the invention not only fills the blank of industrially producing low-ester pectin inland, but also breaks the monopoly of foreign manufacturers on low-ester pectin products, industrial development of low-ester pectin in our country is facilitated, and a national pectin brand is built.

Description

technical field [0001] The invention relates to pectin, in particular to a method for deesterifying low-ester pectin. Background technique [0002] At present, the deesterification process of pectin includes: acid deesterification, alkaline deesterification and enzymatic deesterification. [0003] (1) Acid method deesterification: The obtained pectin polygalacturonic acid content is relatively high, but the reaction speed is slow. Under the same temperature and concentration conditions, its deesterification speed is much lower than that of alkaline method deesterification, and the temperature rise can be accelerated The reaction speed, but the depolymerization speed of the pectin chain will be greatly accelerated, seriously destroying the gel strength of pectin. [0004] (2) Alkaline deesterification: its deesterification speed is fast, but when pectin is deesterified by alkaline method, in addition to the reduction of methoxyl content in the molecule, it will also produce ...

AI Technical Summary

Problems solved by technology

[0003] (1) Acid method deesterification: The obtained pectin polygalacturonic acid content is relatively high, but the reaction speed is slow. Under the same temperature and concentration conditions, its deesterification speed is much lower than that of alkaline method deesterification, and the temperature rise can be accelerated reaction speed, but the depolymerization speed of pectin chains will also be greatly accelerated, seriously destroying the gel strength of pectin

[0004] (2) Alkaline deesterification: its deesterification speed is fast, but when pectin is deesterified by alkaline method, in addition to the reduction of methoxyl content in the molecule, it will also produce depolymerization of pectin molecules, that is, β-elimination reaction , leading to a decrease in pectin molecular weight, viscosity, and gelation degree

[0005] (3) Enzymatic deesterification: In the process of pectin extraction, add pectinase for direct deesterification; Disadvantages: First, due to the long time of pectin extraction, pectinase has destroyed a large number of pectin molecular chains, reducing the The degree of gelation and esterification of pectin seriously affects the quality of pectin; secondly, the quality requirements for raw materials for pectin production are relatively high, and raw materials with low gum content will be depleted due to the long-term action of pectinase during the extraction process. As a result, a large amount of pectin is destroyed, and pectin cannot be extracted in the end; third, a higher temperature is required during the extraction process, which seriously destroys the activity of pectinase, so that a large amount of pectinase does not play a corresponding role, resulting in pectin Too much glue enzyme