A targeted and untargeted metabolomics analysis of 'Oriental Beauty' oolong tea during processing
Lin Zeng, Shan Jin, Yanqing Fu, Lian-shuang Chen, Jun‐Feng Yin, Yong‐Quan Xu
Abstract
Oriental Beauty, a deeply fermented variety of oolong tea, is famous for its fruity aroma and sweet taste. A targeted and untargeted metabolomics was used to comprehensively analyze the dynamic changes of taste and aroma metabolites during processing stage. During the enzyme reaction stage, the catechin components were oxidized and degraded into theaflavins and oolongtheanins. The total abundance of aroma increased from 259.24 to 564.52 μg/L, and mainly monoterpenoids formed. During the nonenzymatic reaction stage, the total abundance of aroma decreased from 564.52 to 274.74 μg/L, and linalool was thermally converted to hotrienol. In this study, metabolomics changes were conducive to better control of tea quality.