Yeast strain and application thereof

Abstract

The invention discloses a beer yeast strain and an application thereof in beer fermentation. The invention provides a saccharomyces cerevisiae Z5 with a preservation number of CGMCC No 3218. A breeding method of the yeast strain comprises the following steps: preparation of an original parent strain, activation in a test tube, ion implantation mutagenesis, laser mutagenesis, wort agar plate primary screening, fermentation bung secondary screening, passage stability test and pilot test. The yeast strain is an excellent beer yeast strain and has a potential of large-scale production of beer breweries.

Description

Technical field: [0001] The invention belongs to the field of yeast, in particular to the breeding and application of beer yeast strains. Background technique: [0002] Brewer's yeast is the lifeblood of beer, and its quality directly affects the quality of beer. Therefore, the isolation and selection of beer yeast is very important, but it is not easy to obtain excellent strains and use them for a long time. Although it is not difficult to construct a beer yeast strain with outstanding indicators by means of genetic engineering and other technical means, based on consumers' safety considerations, and the complete deletion of a certain gene or the introduction of foreign genes may damage the yeast cells. Therefore, no beer company in the beer industry at home and abroad has declared that it uses genetically modified yeast strains to produce beer, and traditional (classic) mutation breeding is still a large The most important and effective technique for most industrial micr...

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Deposit date July 30, 2009