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Profiling of dynamic changes in the microbial community during the soy sauce fermentation process

  • Applied microbial and cell physiology
  • Published:
Applied Microbiology and Biotechnology Aims and scope Submit manuscript

Abstract

Soy sauce is a traditional condiment manufactured by natural inoculation and mixed culture fermentation. As is well known, it is the microbial community that plays an important role in the formation of its flavors. However, to date, its dynamic changes during the long period of fermentation process are still unclear, intensively constraining the improvement and control of the soy sauce quality. In this work, we revealed the dynamic changes of the microbial community by combining a cultured dependent method and a cultured independent method of polymerase chain reaction (PCR)-denaturing gradient gel electrophoresis. Results indicated that the two methods verified and complemented each other in profiling microbial community, and that significant dynamics of the microbial community existed during the fermentation process, especially the strong inhibition of the growth of most of the microbes when entering into the mash stage from the koji stage. In the analysis of bacterial community, Staphylococcus and Bacillus were found to be the dominant bacteria and detected in the whole fermentation process. Kurthia and Klebsiella began to appear in the koji stage and then fade away in the early stage of the mash fermentation. In the analysis of fungal community, Aspergillus sojae and Zygosaccharomyces rouxii were found to be the dominant fungi in the koji and mash fermentation, respectively. It was clearly shown that when A. sojae decreased and disappeared in the middle stage of the mash fermentation, Z. rouxii appeared and increased at the meantime. Aspergillus parasiticus, Trichosporon ovoides and Trichosporon asahii also appeared in the koji and the early period of the mash fermentation and disappeared thereafter. Similar to Z. rouxii, Millerozyma farinosa and Peronospora farinosa were also found spontaneously which appeared in the mid-late period of the mash fermentation. The principal component analysis suggested that the microbial community underwent significant changes in the early period of the fermentation and, thereafter, tended to the stabilization in the mid-late periods. This study gave us important clues to understand the fermentation process and can serve as a foundation for improving the quality of soy sauce in the future.

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Acknowledgments

This work was supported by the program for Changjiang Scholars and Innovative Research Team in University (IRT1166), National High-Tech Research and Development Plan (‘863’ Plan) (No. 2011AA100905-4). We thank Zhiqiang Nie of the College of Bioengineering, Tianjin University of Science and Technology for providing help in using the technique.

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Authors and Affiliations

  1. College of Biotechnology, Tianjin University of Science and Technology, Tianjin, 300457, China

    Quanzeng Wei, Hongbin Wang, Zhixin Chen, Zhijia Lv, Yufeng Xie & Fuping Lu

  2. Lab of Industrial fermentation Microbiology, Ministry of Education, Tianjin, 300457, China

    Quanzeng Wei, Hongbin Wang, Zhixin Chen, Zhijia Lv, Yufeng Xie & Fuping Lu

  3. Tianjin Key Laboratory of Industrial Microbiology, Tianjin, 300457, China

    Hongbin Wang & Fuping Lu

  4. National Engineering Laboratory for Industrial Enzymes, Tianjin, 300457, China

    Hongbin Wang & Fuping Lu

  5. College of Bioengineering, Tianjin University of Science and Technology, No. 29, Ave 13, TEDA, Tianjin, 300457, China

    Fuping Lu

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  1. Quanzeng Wei
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  2. Hongbin Wang
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  3. Zhixin Chen
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  4. Zhijia Lv
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  5. Yufeng Xie
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  6. Fuping Lu
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Correspondence to Fuping Lu.

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Quanzeng Wei and Hongbin Wang contributed equally as the first author.

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Wei, Q., Wang, H., Chen, Z. et al. Profiling of dynamic changes in the microbial community during the soy sauce fermentation process. Appl Microbiol Biotechnol 97, 9111–9119 (2013). https://doi.org/10.1007/s00253-013-5146-9

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  • DOI: https://doi.org/10.1007/s00253-013-5146-9

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