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重组4-甲基苯酚消减乳酸菌的构建及其在白酒酿造体系中的功能
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国家重点研发计划(2018YFC1604103)


Construction of p-cresol reduction recombinant lactic acid bacterium to decrease p-cresol in Chinese liquor fermentation
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    摘要:

    【背景】4-甲基苯酚是众多发酵食品中的异嗅味物质,阈值较低,如白酒中百万分之一的4-甲基苯酚即可对白酒风味造成不利影响。【目的】构建能消减4-甲基苯酚的乳酸菌菌株,探索其在白酒酿造中的应用潜力。【方法】将来源于谷氨酸棒杆菌的4-甲基苯基磷酸酯合成酶编码基因creI与creH在短乳杆菌中表达,探究过表达菌株对白酒酿造体系中4-甲基苯酚的消减能力。【结果】creIH过表达菌株在液体培养基中可有效消减4-甲基苯酚,消减能力达2 130 μg/L;在模拟白酒固态酿造体系中,creIH过表达菌株消减4-甲基苯酚的能力达530 μg/kg,消减率为37.9%。【结论】首次构建了4-甲基苯酚的消减乳酸菌菌株,为白酒酿造体系中4-甲基苯酚的消减提供了新的策略。

    Abstract:

    [Background] p-cresol is an off-odor in a variety of fermented foods. With low threshold, ppm’s p-cresol can adversely affect the flavor of Chinese liquor. [Objective] Recombinant lactic acid bacterium with p-cresol reduction capability was constructed and tested in Chinese liquor fermentation. [Methods] The genes (creI and creH) coding 4-methylbenzyl phosphate synthase were cloned from Corynebacterium glutamicum and ectopically expressed in Lactobacillus brevis. The reduction capability of creIH overexpression strain was determined in Chinese liquor fermentation. [Results] The creIH overexpression strain eliminated p-cresol up to 2 130 μg/L in liquid medium and 530 μg/kg in simulated solid-state fermented grains. The reduction rate in simulated solid-state fermentation reached 37.9%. [Conclusion] This is the first report that lactic acid bacterium with p-cresol reducing capability was constructed. It provides a novel strategy to eliminate p-cresol in Chinese liquor fermentation.

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宫璐婵,任聪,高江婧,徐岩. 重组4-甲基苯酚消减乳酸菌的构建及其在白酒酿造体系中的功能[J]. 微生物学通报, 2020, 47(3): 749-758

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  • 在线发布日期: 2020-03-04
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