Identification of Key Microorganisms and Metabolic Pathways Associated with the Formation of Off-Flavour Compounds in the Pit Mud of Strong-Flavour Baijiu.

Xiaofeng Zhang, Linjia Sun, Liu Yang, Xuesi Li, Zhenhua Cao, Chunmei Pan

Abstract read

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Article in Foods (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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Authors and funding

6 authors.

Xiaofeng ZhangCollege of Life Sciences, Henan University of Animal Husbandry and Economy, Zhengzhou 450046, China.

Linjia SunCollege of Life Sciences, Henan University of Animal Husbandry and Economy, Zhengzhou 450046, China.

Liu YangCollege of Life Sciences, Henan University of Animal Husbandry and Economy, Zhengzhou 450046, China.

Xuesi LiCollege of Biological Engineering, Henan University of Technology, Zhengzhou 450001, China.

Zhenhua CaoHenan Songhe Wine Industry Co., Ltd., Zhoukou 477262, China.

Chunmei PanCollege of Life Sciences, Henan University of Animal Husbandry and Economy, Zhengzhou 450046, China.

Funding

Henan Province 231111112000

6 · The paper itself

Abstract

Off-flavours represent one of the most prevalent and severe causes of deteriorating pit mud quality in Strong-Flavour Baijiu production. However, the key compounds responsible for these off-flavours and their formation mechanisms remain poorly understood, thereby limiting quality control in the production process of Strong-Flavour Baijiu pit mud. To investigate the origin of off-flavours in pit mud, this study employed gas chromatography-mass spectrometry coupled with metagenomic methods to compare samples from normal and off-flavoured pit mud. The results show that the main cause of off-flavours in pit mud is the abnormal accumulation of acids such as heptanoic acid and hexanoic acid due to imbalanced nutrient ratios, along with insufficient synthesis of key esters including ethyl hexanoate, ethyl butyrate, and ethyl lactate; microorganisms such as

Indexed as

metabolic pathwaysmicrobial communityoff-flavour compoundspit mud

Identifiers

PMID42587989

DOI10.3390/foods15152731

PMCPMC13465444

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