Yeast strain and application thereof

Abstract

The invention provides a yeast strain kept under CGMCC NO: 15430 and named as Torulaspora delbrueckii. Experimental results show that the yeast strain has good alcohol tolerance, SO2 tolerance and high sugar tolerance, has a fermenting function in a fermenting broth having a sugar concentration of 200-400 g / L, and features low production of volatile acids and high production of glycerol; in brewedsweet white wine and ice wine, the yeast strain can be mixed with Saccharomyces cerevisiae and fermented to reduce the yield of fruit wine volatile acids, improve the content of fruit wine glycerol,and impart more flower aroma to fruit wines. The yeast strain provided herein has high fermenting capacity and good fermenting performance, and has important value in the application to improve fruitwine quality.

Description

technical field

[0001] The invention belongs to the technical field of microorganisms, and in particular relates to a yeast strain and application thereof. Background technique

[0002] Saccharomyces cerevisiae has always been the main strain of fruit wine fermentation, and a large part of the fermentation strains of the fruit wine we produce use Saccharomyces cerevisiae. In recent years, some researchers have found that the aroma substances produced by non-Saccharomyces cerevisiae account for 90% of the total aroma components of wine. Among them, Torulaspora delbrueckii is a non-Saccharomyces cerevisiae related to wine and belongs to true yeast (the anamorph of Candida colliculosa). Its cells are small and nearly round (6.5 μm × 5.5 μm). The colonies on WLN medium are creamy with light green, spherical protrusions, and the surface is smooth and opaque. T.delbrueckii has a 9-11Mb genome distributed on 8 chromosomes. It is generally believed that the fermentative capacity ...

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