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High-yield fermentative preparation of tetramethylpyrazine by Bacillus sp. using an endogenous precursor approach

  • Original Paper
  • Published:
Journal of Industrial Microbiology & Biotechnology

Abstract

A spore-forming Bacillus sp. was isolated from a high-temperature Daqu, a starter culture of Chinese Maotai-flavor liquor, using an endogenous precursor screening strategy. The Bacillus sp. was capable of producing a high level of 2,3,5,6-tetramethylpyrazine (TTMP) via a precursor of 3-hydroxy-2-butanone (HB). The strain was characterized as Bacillus subtilis based on morphological, physiological, and biochemical properties as well as on partial 16S rRNA gene sequences. Different carbon and nitrogen sources as well as fermentation conditions were investigated. Optimization tests showed that oxygen supply and fermentation temperature were the most important parameters determining the production process. The production of >4.08 g/l TTMP was achieved together with a high level of endogenous precursor HB accumulation (>20 g/l) in both flask and fermentor cultures when the optimized medium and cultivation conditions were applied. Our data demonstrates the effectiveness of the endogenous precursor strategy for screening microorganisms that produce flavor compounds with structure-related precursors. The high yield of TTMP and the inexpensiveness of the agro-industrial product used as the substrate (soybean meal) indicate the potential of this process for industrial application.

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Acknowledgments

Financial support from the Ministry of Science and Technology, P. R. China under National Key Technology R&D Program (2007 BAK36B02 and 2008 BAI63B06), the Ministry of Education, P. R. China under the Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT) (No. IRT0532), the Program of Introducing Talents of Discipline to Universities (111 Project) (111-2-6), the Natural Science Foundation of China (NSFC) (No. 30470046, 20872050), and the State Key Laboratory of Food Science and Technology, Jiangnan University (No. SKLF-MB-200801) is gratefully acknowledged.

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Correspondence to Yan Xu.

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Zhu, BF., Xu, Y. & Fan, WL. High-yield fermentative preparation of tetramethylpyrazine by Bacillus sp. using an endogenous precursor approach. J Ind Microbiol Biotechnol 37, 179–186 (2010). https://doi.org/10.1007/s10295-009-0661-5

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  • DOI: https://doi.org/10.1007/s10295-009-0661-5

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