“…Subsequently, alcohol and acetous fermentation, and vinegar aging occur almost simultaneously in wooden barrels, which is a spontaneous fermentation process driven by diverse microbes from materials and environments. Conversely, in the modern process of fruit vinegar, the alcoholization, acetification, and aging processes are successively carried out through, respectively, inoculating Saccharomyces cerevisiae and acetic acid bacteria (AAB) in different containers ( Figure 2 ) (Giudici et al, 2015 ; Luzón-Quintana et al, 2021 ). During the production processes of the fruit vinegar, VVOCs are derived from the related raw materials, microorganisms, and chemical reactions, such as esterification reaction between acids and alcohols, Maillard reaction, and so on (Marín et al, 2002 ; Corsini et al, 2019 ).…”