Search

Your search keyword '"Han, Xiaoyu"' showing total 1,473 results
Start Over Author "Han, Xiaoyu"
1,473 results on '"Han, Xiaoyu"'

9. Chemical Diversity of Fuzhuan Brick Teas from Hunan and Shaanxi

Author

ZHANG Ning, YU Shilan, YAN Haoyi, ZHANG Yunjun, HAN Xiaoyu, REN Hongyu, CHEN Yuqing, LING Tiejun, AN Maoqiang

Subjects
hunan, shaanxi, fuzhuan brick tea, molecular network, metabolomics, fungal metabolites, Food processing and manufacture, TP368-456
Abstract

This study aimed to explore the diversity of metabolites and compare the metabolite profiles of Fuzhuan brick teas from Hunan and Shaanxi, to find out the difference in chemical components between fresh tea leaves and Fuzhuan brick tea and to identify the metabolites from fungi in Fuzhuan brick tea. Metabolomic studies on fresh tea leaf samples, Hunan and Shaanxi Fuzhuan brick teas and fungi from them were performed using liquid chromatography-tandem mass spectrometry (LC-MS/MS) and molecular networks of characteristic metabolites. The results showed no significant difference between Hunan and Shaanxi samples in the diversity or profile of metabolites. However, the diversity of metabolites significantly increased as fresh tea leaves were processed into Fuzhuan brick tea, with a decrease in the contents of flavan-3-ols, alkaloids, most amino acids and their derivatives being observed, as well as an increase in the contents of lysophosphatidylcholines (LPCs) and fatty acids, which was accompanied by the appearance of a rich variety of fungal metabolites. Among them, the typical ones included isopentenyl cyclic dipeptides, isopentenyl benzaldehydes, whose existence enriched the diversity of metabolites in Fuzhuan brick tea.

Published
2024
Full Text
View/download PDF

10. Metabolomics of Non-volatiles in Typical Chinese Brick Dark Tea

Author

YU Shilan, ZHANG Ning, YAN Haoyi, ZHANG Yunjun, HAN Xiaoyu, REN Hongyu, LING Tiejun, AN Maoqiang

Subjects
typical chinese brick dark tea, metabolomics, non-volatile metabolites, stalk percentage, fungi, molecular networking, Food processing and manufacture, TP368-456
Abstract

To investigate the metabolite profiles of typical Chinese brick dark tea and the relationship between the metabolite types of brick dark tea and fungi isolated from it, this study used non-targeted metabolomics based on liquid chromatography-mass spectrometry (LC-MS) and feature-based molecular networking (FBMN) for metabolomic analysis of typical brick dark tea in China (Hubei Qingzhuan brick tea, Sichuan Kangzhuan brick tea, dark brick tea, Huazhuan brick tea and Fuzhuan brick tea from Hunan, and Fuzhuan brick tea from Shaanxi), fresh tea leaves and various fungal strains isolated from dark tea. The results indicated that the non-volatile metabolite profiles of brick dark tea tended to be classified into two groups according to production regions: one group included brick dark tea from Hunan and Shaanxi, and the other group included brick dark tea from Sichuan and Hubei. The major factor determining the metabolite profile was the stalk percentage of brick tea, and the stalk percentage of brick dark tea from Sichuan and Hubei was significantly higher than that of the other group. The major reason for the difference in metabolite profile between the two groups was the higher contents of flavan-3-ols as well as most amino acids and their derivatives in brick dark tea from Hunan and Shaanxi. The molecular network analysis of the metabolites of brick dark tea and fungi showed that linear and cyclic dipeptides derived from fungi were widely distributed in brick dark tea, especially Kangzhuan brick tea. Isopentenyl diketopiperazine compounds of diverse structural types were found to be abundant in Fuzhuan brick tea, which were derived from Eurotium cristatum. Therefore, fungi contribute to the rich variety of metabolites in brick dark tea. This research can provide a theoretical reference for a comprehensive understanding and knowledge of the chemical basis of quality in typical brick dark tea in China.

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results