Metabolomics and flavor diversity in Cabernet Sauvignon wines fermented by various origins of Hanseniaspora uvarum in the presence and absence of Saccharomyces cerevisiae

Hanseniaspora uvarum were isolated and characterized from various local environments to assess their production of fermentation-related enzymes, including β-glucosidase, esterase, pectinase and protease. Four H. uvarum strains with high enzyme activities were selected for further evaluation of their impact on Cabernet Sauvignon wines by analyzing enological parameters and untargeted metabolomics. Results showed that GS29 and GS38 strains improved aroma diversity and taste characteristics in co-fermentation, while GS36 strain only enhanced aromatic intensity and complexity. Metabolomics revealed that compared to S. cerevisiae, H. uvarum strains popularly reduced intermediate metabolites in glycolysis and TCA cycle, consumed more polypeptides, amino acids, and nucleotides, altered polyphenolic composition ratios, and decreased indole and derivatives. Our study highlights the application of three H. uvarum strains in co-fermentation to improve wine quality and provides insights into the metabolic regulation of each H. uvarum during co-fermentation like by adding intermediate metabolites or precursors.