Influence on the aroma substances and functional ingredients of apple juice by lactic acid bacteria fermentation

This study aimed to analyze the influence of lactic acid bacteria fermentation on the aroma composition and functional composition of apple juice,selected Lactobacillus reuteri to ferment apple juice,used HS-SPME-GC-MS and HPLC to analyze the changes of volatile aroma composition,organic acids and phenols after fermentation.The results showed the best fermentation time was about 18 h;The type and content of volatile substances(mainly alcohols and esters)in fermented juice changed and affected the overall aroma;The content of organic acids such as succinic acid,tartaric acid,malic acid and pyruvic acid affected the taste and flavor;The content of polyphenols such as gallic acid and protocatechuic acid increased,which enhanced the antioxidant capacity and functionality of fermented juice.This result showed the positive effect of fermentation on juice and provided a reference for the subsequent research on the aroma and functional composition of apple juice.