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Acidity drives volatile metabolites in the spontaneous fermentation of sesame flavor-type baijiu

食品科学 发酵 风味 微生物种群生物学 化学 作文(语言) 挥发性有机化合物 生物 细菌 有机化学 语言学 遗传学 哲学
作者
Xueao Ji,Xiao‐Wei Yu,Longyun Zhang,Qun Wu,Fujiang Chen,Fengxue Guo,Yan Xu
出处
期刊:International Journal of Food Microbiology [Elsevier BV]
卷期号:389: 110101-110101 被引量:8
标识
DOI:10.1016/j.ijfoodmicro.2023.110101
摘要

Environmental factors play an important role in contributing to intricate compositional dynamics and volatile metabolites in food fermentation. However, our understanding of which and how environmental factors affect volatile metabolites during sesame flavor-type baijiu fermentation is poor. Here, we examined the effects of environmental factors on the bacterial and fungal community to determine how changes in representative factors impact the microbial structure, diversity, and volatile metabolites in three fermentations. Results showed that bacterial community (ANOSIM: R = 0.79, P = 0.001), fungal community (ANOSIM: R = 0.65, P = 0.001), and volatile metabolites (ANOSIM: R = 0.84, P = 0.001) were significantly different in three fermentations. Acidity, ethanol, and moisture negatively impacted bacterial composition and diversity (P < 0.05). The fungal diversity and structure were positively and significantly affected by acidity (path coefficient, b = 0.54 for diversity, b = 0.35 for structure, P < 0.05). The fungal community rather than the bacterial community was the strongest driver of volatile metabolites. Fungal structure and diversity were equally important for the composition and content of volatile metabolites (structure: b = 0.50, diversity: b = 0.56, P < 0.05). 66 % of variations in volatile metabolites could be explained. Altogether these results indicated that acidity strongly drove volatile metabolites by modulating fungal structure and diversity. This work provides insights into managing volatile metabolites by regulating initial acidity in sesame flavor-type baijiu fermentation.
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