Method for extracting tea polysaccharide from tea residues

Abstract

The invention discloses a method for extracting tea polysaccharide from tea residues. The method comprises the following steps: 1, tea residue pretreatment; 2, microwave wall breaking; 3, variable-frequency ultrasonic composite enzymolysis; 4, centrifugal concentration; 5, alcohol precipitation; and 6, washing and drying. According to the method, the advantages of various extraction methods are combined, the technical characteristics of microwave, ultrasonic wave and enzyme treatment are effectively combined, the wall breaking efficiency is effectively improved, the polysaccharide structure isnot damaged, and the yield and the antioxidant activity of the polysaccharide are remarkably improved.

Description

technical field

[0001] The invention belongs to the field of tea deep processing, and in particular relates to a method for extracting tea polysaccharide from tea dregs. Background technique

[0002] Large-scale tea deep-processing plants such as tea beverages, tea polyphenols, and catechins produce a large amount of tea dregs during the production process. The normal production process only uses the water-soluble components in the tea leaves, and there are still some tea residues in the tea dregs. Effective substances such as polyphenols, amino acids, crude protein, crude fiber, and tea residue have high utilization value; tea polysaccharide is a compound polysaccharide, which is composed of sugar, pectin and protein. The specific composition is: total sugar content 30.92% , protein 17.87%, moisture 8.89%, ash 16.48%, pectin 12.92%, other 12.92%. Tea polysaccharides have physiological functions such as lowering blood sugar, lowering blood pressure, resisting hypoxia, incre...

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