Pectin and extraction method and preparation method thereof

Abstract

The invention discloses pectin and an extraction method and a preparation method thereof. The extraction method comprises the steps: adding organic weak acid salt into an acidic pectin extracting solution, uniformly mixing, carrying out membrane filtration on the extracting solution treated by the organic weak acid salt, carrying out alcohol precipitation or salting-out on the extracting solution,and separating to obtain the pectin, wherein the addition amount of the organic weak acid salt in the mixed solution is 0.2-1 mg/mL. Due to the fact that a proper amount of organic weak acid salt isadded before membrane filtration, pectin colloid is further stabilized, pectin is not prone to precipitation on the surface of a membrane during membrane concentration, meanwhile, pigments, saccharides, calcium, magnesium and other salts in the pectin can be removed, the membrane flux can be increased, and membrane pollution is effectively relieved. Besides, in the salting-out process, low-valencesalt can be used as a precipitating agent, complexing of high-valence cations in a salt solution and the pectin is avoided, pectin desalination is easy to carry out, and thus the problems that pectinis low in extraction rate, heavy in color and low in purity are solved, and the ash content of the pectin is not high.

Description

technical field [0001] The invention relates to the technical field of pectin preparation, in particular to a pectin and its extraction method and preparation method. Background technique [0002] Pectin is a natural polymer substance composed of galacturonic acid. It is used as a gelling agent and thickener in the food industry and pharmaceutical industry. The world demand is increasing year by year. For example, citrus peel contains a large amount of pectin (about 25%), and a large amount of discarded citrus peel waste is produced every year in my country, so extracting pectin from citrus peel waste is an effective method for rational utilization of resources. [0003] At present, in the pectin extraction process, the traditional acid extraction method is still used, but the yield of pectin extracted by the traditional acid method is generally low, and the addition of sodium hexametaphosphate in the acid extraction process produces a large amount of Phosphorus wastewater ...

AI Technical Summary

Problems solved by technology

However, the ethanol precipitation method consumes a large amount of alcohol (2 to 3 tons of alcohol per ton of finished pectin on average). Big

At present, the vacuum concentration method is often used to increase the concentration of pectin extract. Although some researches use ultrafiltration membrane technology to concentrate, the membrane pollution is very serious, and the membrane flux is small, which cannot achieve the effect of effectively concentrating the acidic pectin extract. Value

[0004] Therefore, in the prior art, there is a technical problem that the pectin extract cannot be effectively concentrated by membrane, so that it needs to consume a large amount of alcohol and salt for alcohol precipitation or salting out, and the quality of the obtained pectin is also poor.

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