摘要:采用高产酿酒酵母(
Saccharomyces cerevisiae)SCY6 发酵葡萄糖产乙醇,设计
单因素试验考察该酵母菌株适宜的生长条件,采用正交试验优化酵母发酵产乙醇的条件。结
果表明,该酵母菌株的最适生长温度和
pH 分别为 28
℃、5.0,培养基中葡萄糖质量分数为
15%时其生长状态较好。正交试验结果表明,最适合该酿酒酵母发酵产乙醇的条件为玉米浆
和(
NH4)2SO4 作为氮源,用量分别为 20 g/L 和 2 g/L,接种量为 4%,pH 5.0。在此条件下
进行发酵,发酵液中乙醇体积分数可达
7.77%,葡萄糖转化率达 83.82%。
关键词:酿酒酵母(
Saccharomyces cerevisiae);生长;发酵;乙醇
中图分类号:
TS261.1 文献标识码:A 文章编号:0439-8114(2012)21-4856-04
Optimization of Growth and Fermentation Conditions for High Ethanol-Producing
Saccharomyces cerevisiae Strain SCY6
GU Hua-xiang,SONG Chen,LI Xun
(
College of Chemical Engineering , Nanjing Forestry University/Jiangsu Key Lab of
Biomass-Based Green Fuels and Chemicals,
Nanjing 210037, China)
Abstract: The high ethanol-producing Saccharomyces cerevisiae strain SCY6 was used to
ferment glucose to ethanol. Single factor tests were conducted to optimize the cultivation
conditions ; while orthogonal design was adopted to optimize ethanol fermentation conditions.
The results showed that the optimum temperature and pH for yeast growth was 28
℃ and 5.0,
respectively. The yeast grew well when mass ratio of glucose in YPD medium was 15%. The result
of orthogonal test showed that the optimal ethanol fermentation conditions were , 2
g/L(NH4)2SO4 and 20 g/L corn syrup as N source; inoculation dose, 4% volume fraction;
and pH 5.0. The yield of ethanol reached 7.77%; and the conversion rate of glucose was 83.82%
under these conditions.
Key words: Saccharomyces cerevisiae; growth; fermentation; alcohol
随着科技的不断发展,人们对燃料型能源的需求日益加大。石油煤炭资源不仅污染环境,
而且是不可再生资源。乙醇作为石油的替代能源,具有污染小、可再生、易运输和易储藏的特
点,将农林废弃物转化为燃料乙醇是解决能源危机的一条理想途径
[1,2]。燃料乙醇的生产
分为化学合成和生物转化两种方式,其中生物转化法以其低污染和高效率的特点更具竞争
力。酿酒酵母(
Saccharomyces cerevisiae)是生物转化法发酵产乙醇最常用的菌种之一,目
前对酿酒酵母发酵工艺的改进已成为研究的热点
[2-4]。本研究对一株高产酿酒酵母的生长与
发酵条件进行优化,以期为实现乙醇的低成本、高效率生产,促进酵母在乙醇发酵工业中的