Isolation and identification of Starmerella davenportii strain Do18 and its application in black tea beverage fermentation  

作　　者：Chuanhai Tu Wenxiu Hu Sijie Tang Ling Meng Zhihai Huang Xiao Xu Xiudong Xia Fidelis Azi Mingsheng Dong 

机构地区：[1]College of Food Science and Technology,Nanjing Agricultural University,Nanjing,Jiangsu Province 210095,China [2]Institute of Agro-Product Processing,Jiangsu Academy of Agricultural Sciences,Nanjing,Jiangsu Province 210014,China [3]Nanjing Institute for Food and Drug Control,Nanjing,Jiangsu Province 211198,China

出　　处：《Food Science and Human Wellness》2020年第4期355-362,共8页食品科学与人类健康（英文）

基　　金：This work was supported by the Jiangsu Agricultural Industry Technology System[No.JATS-2018-296];and the National Natural Science Foundation of China[Grant No.31501460].

摘　　要：The objective of this study was to isolate and identify a yeast strain from the kombucha beverage and evaluate its potential as a novel starter in beverage fermentation in vitro.Starmerella davenportii Do18 was characterized for its cholesterol reduction;growth at different conditions such as temperatures(25,30,37 and 42◦C),low pH(1.2,1.5,2.03.0,and 7.0),bile salts(0%,0.25%,0.5%,1%and 2%)high-sucrose stress(2%,10%,20%,40%and 60%);and in-vitro survival in gastric and intestinal environments.Results showed that the yeast strain has a cholesterol-lowering capacity of 45%±2%,grew at temperature of 37◦C and is resistant to pH 1.5,2%bile and 40%sucrose solution,could survive in simulated gastric and intestinal environments.The physicochemical characteristics of the fermented beverages were also evaluated,which indicated that the yeast has pH reduction capacity and can produce organic acids and volatile compound such as 2-phenylethanol.Furthermore,the fermented beverage also has high total phenolics and flavonoids content and showed great antioxidant and antimicrobial activities.Therefore,the findings of this research provide strong evidence that S.davenportii Do18 has good fermentation properties,can be a potential starter in food and beverage fermentation.

关 键 词：Starmerella davenportii Yeast fermentation Tea beverage AROMA 2-PHENYLETHANOL 

分 类 号：TS275.2[轻工技术与工程—农产品加工及贮藏工程]