title: Analysis and comparison of the bacterial community in fermented grains during the fermentation for two different styles of Chinese liquor.
abstract: Bacterial populations in fermented grains during fermentation may play important roles in Chinese liquor flavor. PCR-based denaturing gradient gel electrophoresis (DGGE) and 16S rRNA gene library analysis were performed to analyze the bacterial community structure of two styles of liquor. The results of DGGE profiles showed that bacterial diversity decreased with the fermentation process and Lactobacillus acetotolerans became the predominant species at the end of the fermentation. But the obvious differences of bacterial community appeared in the middle stage of two styles of liquor fermentation, in which the different upstream production techniques were used. Moreover, 16S rRNA gene libraries of two styles were constructed. A total of 125 and 107 clones, chosen from two libraries, were grouped into 46 and 49 operational taxonomic units (OTUs) by amplified ribosomal DNA restriction analysis. According to sequencing results of clones, the predominant bacteria in strong aroma style fermented grains were those from the class Bacilli, Bacteroidetes, and Clostridia, whereas the predominant bacteria in fermented grains of roasted sesame aroma style belonged to Bacilli, Flavobacteria, and Gammaproteobacteria. Molecular analysis of the bacterial diversity of the liquor fermentation will benefit the analysis of important microorganisms playing key roles in the formation of liquor flavor components.
authors.affiliation: State Key Laboratory of Food Science and Technology, Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, 1800 Lihu Avenue, 214122 Wuxi, Jiangsu, China.
authors.forename: Hai-Yan
authors.initials: HY
authors.lastname: Wang
authors.forename: Xiao-Jun
authors.initials: XJ
authors.lastname: Zhang
authors.forename: Li-Ping
authors.initials: LP
authors.lastname: Zhao
authors.forename: Yan
authors.initials: Y
authors.lastname: Xu
mesh_terms: D001419:Bacteria / Q000145:classification / Q000235:genetics / Q000254:growth & development* / Q000302:isolation & purification*; D044822:Biodiversity; D002681:China; D002523:Edible Grain / Q000382:microbiology*; D004591:Electrophoresis, Polyacrylamide Gel; D005285:Fermentation; D005516:Food Microbiology; D007778:Lactobacillus / Q000235:genetics / Q000302:isolation & purification; D008969:Molecular Sequence Data; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D012336:RNA, Ribosomal, 16S / Q000235:genetics
chemical_list: D012336:RNA, Ribosomal, 16S