食品科学

• 生物工程 • 上一篇    下一篇

耐高温酵母菌的筛选及其乙醇发酵特性

刘超帝,缪礼鸿*,陈 瑾,刘蒲临   

  1. 武汉轻工大学生物与制药工程学院,湖北 武汉 430023
  • 出版日期:2016-10-15 发布日期:2016-12-01

Isolation and Alcohol Fermentation Characteristics of Thermotolerant Yeasts

LIU Chaodi, MIAO Lihong*, CHEN Jin, LIU Pulin   

  1. School of Biology and Pharmaceutical Engineering, Wuhan Polytechnic University, Wuhan 430023, China
  • Online:2016-10-15 Published:2016-12-01

摘要:

采用平板分离法,从29 份新鲜采集的土样中分离获得64 株耐高温酵母菌株,并对其在高温条件下的乙醇发酵性能进行了分析比较。26S rDNA D1/D2区域序列测定和生理特征分析结果表明,这些酵母菌株在亲缘关系上可归类于6 个属7 个种,分别为热带假丝酵母(Candida tropicalis)(占总分离株的39.1%)、马克斯克鲁维酵母(Kluyveromyces marxianus)(占23.4%)、东方伊萨酵母(Issatchenkia orientalis)(占29.7%)、季也蒙毕赤酵母(M. guilliermondii)(占1.6%)、Kazachstania bovina(占1.6%)、Candida palmioleophila(占1.6%)和酿酒酵母(Saccharomyces cerevisiae)(占3.1%)。其中,马克斯克鲁维酵母的耐高温能力和乙醇发酵能力最强;40 ℃条件下发酵72 h后,发酵液中乙醇体积分数最高可达6.56%,显著高于相同条件下其他耐高温酵母的乙醇产量。上述结果表明,马克斯克鲁维酵母在高温乙醇发酵过程中具有明显优势,可作为利用生物质发酵生产乙醇的优良候选菌株。

关键词: 耐高温酵母菌, 生物多样性, 26S rDNA, 乙醇发酵

Abstract:

In this study, 69 thermotolerant yeast strains were isolated from 29 different soil samples, and the fermentation
performance of these strains at high temperature was also detected. Based on 26S rDNA D1/D2 domain sequence analysis
and physiological characterization, these strains were phylogenetically related to 7 species in 6 genera, including Candida
tropicalis (39.1% of the total yeast strains), K. marxianus (23.4%), I. orientalis (29.7%), M. guilliermondii (1.6%), K. bovina
(1.6%), C. palmioleophila (1.6%) and S. cerevisiae (3.1%). C. tropicalis were the most widely distributed species. The best
thermotolerant and ethanol fermentation ability were detected in K. marxianus. The ethanol production reached up to 6.56%
(V/V) in 72 h at 40 ℃. These results demonstrated that K. marxianus has obvious advantages in ethanol fermentation at high
temperature, which makes it a good potential candidate for commercial biomass ethanol production.

Key words: thermotolerant yeast, biodiversity, 26S rDNA, alcohol fermentation

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