Improvement of physicochemical characteristics, bioactivity, flavor and metabolic profiles of mango juice fermented by Limosilactobacillus reuteri

The aim of this study was to explore the alterations in physicochemical characteristics, bioactivity, flavor and metabolic profiles of mango juice fermented by Limosilactobacillus reuteri FJG2526 (L. reuteri FJG2526). The results exhibited that L. reuteri FJG2526 had strong adaptability in mango juice, and reduced the total sugar, polyphenolics and flavonoids content of mango juice. L. reuteri FJG2526 fermentation ameliorated the flavor profiles of mango juice, particularly promoted the production of acids, alcohols, and esters. Moreover, 107 metabolites in the mango juice were drastically altered after 48 h L. reuteri FJG2526 fermentation by metabolomic analysis, including 73 remarkably upregulated metabolites and 34 remarkably downregulated metabolites, primarily involving amino acid metabolism. In addition, L. reuteri FJG2526 fermentation also enhanced the ability to scavenge DPPH and OH free radicals of mango juice, and inhibited lipase and α-glucosidase activities. This study offers new insights into the mango juice fermentation and will contribute to the application of L. reuteri in functional juices.