7 c showed that the relative contents of trans-cinnamic acid, ferulic acid and protocatechuic acid in fermented grains showed a trend of fluctuation and increase, while the relative contents of cinnamic acid and caffeic acid showed a trend of sharp decline.
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Phenolic metabolites changes during baijiu fermentation through non-targeted metabonomic.
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The sentences
7 d show that the relative content of all tannins showed a decreasing trend.