食品科学 ›› 2011, Vol. 32 ›› Issue (13): 225-228.doi: 10.7506/spkx1002-6630-201113049

• 生物工程 • 上一篇    下一篇

西藏灵菇中产胞外多糖嗜热链球菌的分离筛选及其发酵性能测定

李达1,张雪1,张莉1,赵玉娟1,牛春华1,丛培2,杨贞耐1,*   

  1. 1.吉林省农业科学院农产品加工研究中心 2.吉林省天景食品有限公司
  • 出版日期:2011-07-15 发布日期:2011-07-02
  • 基金资助:
    国家现代农业产业技术体系建设专项(nycytx-0502);国家自然科学基金项目(30600575); 吉林省科技厅重点项目(20080228)

Isolation, Screening and Fermentation Performance of Exopolysaccharide-producing Streptococcus thermophilus from Tibetan Kefir

LI Da1,ZHANG Xue1,ZHANG Li1,ZHAO Yu-juan1,NIU Chun-hua1,CONG Pei2,YANG Zhen-nai1,*   

  1. (1. Center for Agro-food Technology, Jilin Academy of Agricultural Sciences, Changchun 130033, China; 2. Jilin Sky-Scenery Food Co. Ltd., Changchun 130123, China)
  • Online:2011-07-15 Published:2011-07-02

摘要: 从西藏灵菇中分离筛选、鉴定高产胞外多糖的乳酸菌菌株,并对其发酵性能和流变学参数进行测试。筛选的9株菌,菌种鉴定结果均为嗜热链球菌,其中菌株KC1、KC2、KC6、KC17产胞外多糖,菌株KC5、KC7、KC15、KC16、KC22不产胞外多糖。产胞外多糖菌株发酵乳发酵性能、黏度和黏附性指标均明显高于不产胞外多糖的嗜热链球菌,进一步证实了嗜热链球菌产生的胞外多糖可以赋予发酵乳良好的质地。

关键词: 西藏灵菇, 乳酸球菌, 胞外多糖

Abstract: In this study, 9 strains, KC1, KC2, KC5, KC6, KC7, KC15, KC16, KC17 and KC22 , were isolated and screened out from Tibetan kefir. All of the strains were identified as Streptococcus thermophilus. KC1, KC2, KC6 and KC17 were found to be capable of producing exopolysaccharides, while KC5, KC7, KC15, KC16 and KC22 had no such ability. The exopolysaccharide-producing strains presented better fermentation performance and fermented milks obtained with each of them had higher viscosity and adhesiveness when compared to the non-exopolysaccharide-producing strains, thus further demonstrating that exopolysaccharides from Streptococcus thermophilus can provide fermented milk with excellent texture.

Key words: Tibetan kefir, Streptococcus thermophilus, exopolysaccharide

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