Microcapsule preparing process utilizing waste beer yeast cell as wall material

Abstract

The present invention discloses process of preparing microcapsule with waste beer yeast cell as wall material. Waste beer yeast recovered from fermentation plant is prepared into microcapsule through the steps of washing, sieving, centrifuging, etc. to purify; vacuum drying or spray drying to obtain dry yeast grains of 0.5-2 size and water content of 2 %; adding capsule core material in 1-4 times the dry yeast mass and vibrating at 30-80 deg.c for 4-12 hr to make the capsule core material penetrate into yeast cell; washing and drying. The present invention has the advantages of low cost, high core material embedding rate, fast embedding, and simple post washing and drying.

Description

technical field [0001] The invention relates to a method for preparing microcapsules by using waste beer yeast cells as wall materials, and belongs to a microcapsule preparation technology. Background technique [0002] Microcapsule technology is to use natural or synthetic polymer compounds as film-forming materials to prepare microcapsules. The substance enclosed in the microcapsule is called the capsule core, and the outer membrane formed by the film-forming material is called the capsule wall. Through microencapsulation, the core material can be protected from the influence of the external environment, reduce volatility, and improve stability, and microencapsulation also has the advantages of shielding odor, reducing toxicity, and controlling release. The preparation of microcapsules usually adopts three types of chemical methods, physical methods and physicochemical methods. However, these methods generally have limitations such as complex preparation process, high pr...

AI Technical Summary

Problems solved by technology

[0004] But adopt this method to prepare microcapsules, generally all have special requirement to used yeast: as yeast needs through special culture condition, make intracellular fat content reach more than 40% (mass fraction) (U.S., USP4001480,1977); Microcapsule preparation process The yeast cells in the medium need to maintain biological activity (European Patent Office, EP0242135A2, 1987; United States, USP 5288632, 1994); and usually used in the form of wet cells, the water content of the cells is high, and the yeast cells are bonded into blocks and dispersed The hydration film on the cell surface will affect the penetration of the fat-soluble capsule core into the yeast cell, and the subsequent drying and granulation operations are also relatively difficult (U.S., USP 4001480, 1977; Britain, GP 2162147, 1986; European Patent Office, EP 0085805A1, 1982; European Patent Office, EP 0242135A2, 1987; United States, USP 5288632, 1994)

In addition, the cost of preparing microcapsules from freshly cultured yeast cells is relatively high.