Microbial metabolism during the thermophilic phase promotes the generation of aroma substances in <i>nongxiangxing Daqu</i>.

4 c, most of the VOCs, such as tetramethylpyrazine, 2-ethyl-3,5,6-trimethylpyrazine, 2,3-tetramethylpyrazine, 2-ethyl-3,5,6-trimethylpyrazine, 2,3-dimethyl-5-ethylpyrazine, ethyl nicotinoate, 3-phenylfuran, undecane, hexamethylcyclotrisiloxane, tridecane, dodecane, pyrrole-2-carboxaldehyde, cyclohexasiloxane, dodecamethyl, 2-acetyl pyrrole, and decamethylcyclopentasiloxane, showed an increasing trend, suggesting that high-temperature environments effectively stimulate the microbial community to convert substrates into flavor substances.

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