食品科学

• 生物工程 • 上一篇    下一篇

酱香型大曲中分离到的阿姆斯特丹散囊菌产酶产香特性

王晓丹1,2,徐 佳2,周鸿翔2,班世栋2,邱树毅1,2,*   

  1. 1.贵州大学 贵州省发酵工程与生物制药重点实验室,贵州 贵阳 550025;
    2.贵州大学酿酒与食品工程学院,贵州 贵阳 550025
  • 出版日期:2016-06-15 发布日期:2016-06-27

Characterization of Eurotium cristatus Isolated from Maotai-Flavored Daqu, a Traditional Chinese Maotai-Flavored Liquor Fermentation Starter, for Its Abilities to Produce Enzymes and Aromas

WANG Xiaodan1,2, XU Jia2, ZHOU Hongxiang2, BAN Shidong2, QIU Shuyi1,2,*   

  1. 1. Guizhou Provincial Key Laboratory of Fermentation Engineering and Biological Pharmacy, Guizhou University,
    Guiyang 550025, China; 2. School of Liquor-making and Food Engineering, Guizhou University, Guiyang 550025, China
  • Online:2016-06-15 Published:2016-06-27

摘要:

为了探究酱香型大曲中霉菌的种类及其功能,采用稀释平板涂布法从遵义地区的6 个企业的酱香型大曲中分离筛选霉菌菌株,结合形态观察和真菌rDNA-ITS基因序列同源性比对进行分析。在其中5 个企业的大曲样品中均能筛选分离得到一株散囊菌,归类并命名为阿姆斯特丹散囊菌(Eurotium cristatus)。以茅台大曲筛选的阿姆斯特丹散囊菌(FBKL3.0120)为研究对象,该菌株产糖化型淀粉酶活力最高,达到(3 100.16±109.43) U/g,酸性蛋白酶活力为(225.69±2.69) U/g、果胶酶活力为(435.88±68.49) U/g、脂肪酶与纤维素酶活力分别为(13.56±1.73) U/g和(4.14±0.16) U/g。采用固相微萃取-气质联用技术对固态发酵的挥发性香味物质进行结果分析,该菌固态发酵具有很强花香和果蔬香,挥发性香味物质以高级醇、酮和呋喃类为主,其中L-芳樟醇、1-辛烯-3-醇、3-辛酮、2-戊基呋喃的相对含量较高,分别为挥发性物质的16.37%、41.23%、6.95%、6.75%。分离得到的这株阿姆斯特丹散囊菌(FBKL3.0120)是一株产多种酶并同时产多种香气成分的霉菌,是酱香大曲微生物组成中的重要霉菌之一。

关键词: 酱香大曲, 阿姆斯特丹散囊菌, 酶活力, 香气成分

Abstract:

In order to explore mold species and functions in Maotai-flavored Daqu, a fermentation starter culture of Chinese
Maotai-flavored liquor, we used the dilution and plate spread method to isolate and screen molds in Maotai-flavored Daqu
from 6 manufacturers in Zunyi region of Guizhou province. Then, we combined morphological observation and fungal
rDNA-ITS sequence homology analysis to identify the isolated molds. Samples from 5 liquor producers were detected to
each contain an Eurotium strain, which was classified and identified as Eurotium cristatus. Among five isolates, the strain
named as FBKL3.0120 was measured to have the highest saccharifying amylase activity (up to (3 100.16±109.43) U/g).
The acid protease, pectase, lipase and cellulase activities of the strain were (225.69±2.69), (435.88±68.49), (13.56±1.73),
and (4.14±0.16) U/g, respectively. Solid-phase microextraction combined with gas chromatography-mass spectrometry
(GC-MS) was used to analyze the volatile flavor compounds produced in solid-state fermentation by strain FBKL3.0120.
The fermentation process produced strong floral, fruity and vegetable aromas. The volatile aroma components mainly
included higher alcohols, ketones and furans with L-linalool, 1-octen-3-ol, 3-octanone, and 2-amylfuran being dominant,
accounting for 16.37%, 41.23%, 6.95%, and 6.75%, respectively. Eurotium cristatus FBKL3.0120 could produce many
enzymes and aromas, and it was one of the important molds in the microbial composition of Maotai-flavor Daqu.

Key words: Maotai-flavored Daqu, Eurotium cristatus, enzyme activities, aroma components

中图分类号: