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Desired soy sauce characteristics and autolysis of Aspergillus oryzae induced by low temperature conditions during initial moromi fermentation

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Abstract

This is the first report on the effect of low temperature stress applied during initial moromi fermentation on the quality and taste of soy sauce. Koji was prepared to yield initial moromi under three comparative fermentation conditions over 9 days: (1) 4 °C and 0% brine (i.e., water) (LTSF); (2) 4 °C and 16% w/w brine (LTSH); (3) 25 °C and 16% w/w brine (the control, CRTH). Greater extent of autolysis in samples was found under low temperature stress conditions (i.e., at 4 °C, a temperature much lower than the normal temperature range like 25 °C for natural microbial growth and performance). Compared to CRTH, LTSF had a two-fold increase of glutaminase activity in dregs and 65.17% increase in supernatant, and after 60 days of moromi fermentation, a 5.73% and 3.47% increase, respectively, in the contents of glutamic acid (Glu) and aspartic acid (Asp). LTSF had the highest total free amino acid content due to both the low temperature stress and absence of salt. The intensity ranking of umaminess and kokumi sensation (LTSF > LTSH > CRTH) revealed by sensory analysis followed the changing trends of their umami and sweet amino acid contents with a trend reversal in the bitter amino acid content. Low temperature (4 °C) without brine for initial moromi fermentation seemed beneficial, leading to a soy sauce product with desired taste and amino acid contents.

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Acknowledgements

The authors are grateful for the financial support from National key Technologies R&D Program for 13rd Five-year Plan (2016YFD0400803), the Fundamental Research Funds for the Central Universities (2017ZD093), the Science and technology plan project of Guangdong Province (2017A010105002) and National Natural Science Foundation of China (31201416 and 31571821).

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Authors and Affiliations

  1. School of Food Science and Engineering, South China University of Technology, Guangzhou, 510640, China

    Wensi Zhou, Dongxiao Sun-Waterhouse, Jian Xiong, Chun Cui & Wei Wang

  2. Guangdong Weiwei Biotechnology Co., LTD, Guangzhou, 510640, China

    Keming Dong

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  1. Wensi Zhou
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  2. Dongxiao Sun-Waterhouse
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Correspondence to Chun Cui.

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Zhou, W., Sun-Waterhouse, D., Xiong, J. et al. Desired soy sauce characteristics and autolysis of Aspergillus oryzae induced by low temperature conditions during initial moromi fermentation. J Food Sci Technol 56, 2888–2898 (2019). https://doi.org/10.1007/s13197-019-03742-5

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