Figure 3
Distribution of metabolites in the whole fermentation of SAV. (a) Distribution of nonvolatile metabolites analyzed by GC–MS. Different colors represent different metabolites. All metabolites are divided into groups of sugar derivatives, alcohols, amino acids, and others, except for the relative higher abundances of glucose, fructose, and mannose. (b) Distribution of ethanol (%, v/v) analyzed by HPLC in different fermentation stages. (c) Distribution of seven dominant organic acids analyzed by HPLC in different fermentation stages. AF1d–AF12d represent specimens from 1 day to 12 days of alcohol fermentation, and AAF0d–AAF7d represent specimens from 0 day to 7 days of acetic acid fermentation.
