Study on Screening and Fermentation Capability of Lactobaeter Yielding Exopolysaccharide from Kefir Grains

Abstract

Abstract: In this paper,the strain of high yield exopolysaccharide was obtained by high throughput screening technology and phenol-H2SO4 method.These strains prosecution test were assayed for fermentation capability and yogurt quality.Eight strains were screened for high yield exopolysaccharide and good fermentation capability.The results of identified bacteria species are: strain KTx,KL1 and J1 as Lactobacillus casei,strain Tx as Streptococcus thermophilus,strains KS4,J4,P1,P5 as Lactococcus lactis subsp,lactis.The viscosity of starter produced by Streptococcus thermophilus Tx is the best,coagulating time is the shortest, and sensory evaluation is the highest.This strain to exploit can be useed and manufacture functional kefir yogurt with good stabifity.

Key words: kefir grains, Lactobacter, exopolysaccharide, fermentation capability

LIU Hui, XIONG Li-Xia, YI Xin-Xin, ZHANG Hong-Xing, ZHANG Jin-Yong. Study on Screening and Fermentation Capability of Lactobaeter Yielding Exopolysaccharide from Kefir Grains[J]. FOOD SCIENCE, 2007, 28(5): 211-215.

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Study on Screening and Fermentation Capability of Lactobaeter Yielding Exopolysaccharide from Kefir Grains

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