Method for extracting tea saponin from oil-tea-cake

Abstract

The invention discloses a method for extracting tea saponin from oil-tea-cake. The method comprises the following steps of: leaching, namely performing continuous countercurrent leaching or multiple intermittent leaching on oil-tea-cake, of which residual oil is extracted and which is dried, by using C1-C6 alcohol as a solvent; concentrating, namely concentrating extracting solution until the solution is supersaturated, wherein the concentration operation is performed under micro-negative pressure; cooling and filtering, namely cooling concentrated solution and filtering, wherein the cooling temperature is room temperature to 0 DEG C; and drying, namely drying and desolventizing a solid obtained after cooling and filtration, wherein the dried and desolventized solid is a finished product of tea saponin powder. The method has the advantages that: (1) the extraction yield of the tea saponin is high, and the residual amount of the tea saponin of the oil-tea-cake in which the tea saponin is extracted is less than 2 percent; (2) the extraction and concentration operation is performed under micro-negative pressure, and the problem that safety accidents are caused by the volatilization of a large quantity of organic solvents in leaking workshops is solved; (3) the purified tea saponin has high purity and good color and luster; and (4) the process is simple, production cost is low, energy consumption is low, the yield is over 90 percent, the purity of an obtained tea saponin product is more than or equal to 91 percent, and the method is suitable for industrialized production.

Description

Technical field [0001] The invention relates to a method for extracting tea saponin from oil tea cake, in particular to a method for extracting tea saponin from oil tea cake using alcohol as a solvent. Background technique [0002] Tea saponin, also known as tea saponin, is a type of natural glycoside compound extracted from the camellia family (Theaceac) plants (such as tea, camellia, camellia). It is composed of seven ligands (C 30 H 6 O 6 ) (Sapgening), four kinds of glycosides (Aglyevn) and two kinds of organic acids constitute a five-ring triterpenoid tea saponin. [0003] Tea saponin is a pure natural non-ionic surfactant. Its molecule has hydrophilic sugar bodies and hydrophobic ligand groups. It has emulsification, dispersion, wetting, decontamination, foaming and foam stabilization. And other surface activities, especially with strong foaming ability, and the foam produced is stable, not affected by water hardness. In addition, tea saponin also has significant effects of ...

AI Technical Summary

Problems solved by technology

In the mid-to-late 1980s, some domestic production plants used water as a solvent to extract tea saponin. Due to technical reasons, high energy consumption, low extraction rate, poor product quality, and high production costs, all of them were discontinued one after another.

And extract tea saponin with organic solvent (methanol, ethanol, isopropanol), because organic solvent belongs to inflammable and explosive chemical, and investment is big, and solvent consumption is many, and production cost is high, and it is due to adding in the production process Influenced by factors such as substances or operating conditions, the structure of tea saponin changes and the product quality is poor.

Both the organic solvent method and the water immersion extraction method have the problem of difficult product purification