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ORIGINAL RESEARCH article
Front. Sustain. Food Syst.
Sec. Sustainable Food Processing
Volume 8 - 2024 |
doi: 10.3389/fsufs.2024.1436542
This article is part of the Research Topic Metabolomics to Uncover the Dynamic Changes and Formation Mechanism of Flavor in Fermented Food During Processing View all articles
Unraveling the dynamic changes of volatile compounds during the rolling process of Congou black tea via GC-E-Nose and GC-MS
Provisionally accepted- 1 Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, China
- 2 Tea Research Institute, Hangzhou Academy of Agriculture, Hangzhou, China
Rolling plays an important role in shaping the characteristic quality of black tea. However, the dynamic alterations in volatile compounds during the rolling process remain unclear, which hampers the quality control of black tea. In this study, the dynamic changes of volatile compounds in Congou black tea throughout the rolling process were explored by a combination of GC-E-Nose and GC-MS analysis. A total of 82 volatile compounds including eight categories were identified in Congou black tea during the rolling process. The most abundant volatiles were aldehydes, alcohols, and esters. The results of PCA and PLS-DA revealed significant alterations in the volatile profiles, particularly at the 15-min rolling stage. Through the integration of variable importance in the projection > 1 and p < 0.05, 21 volatile compounds were pinpointed as pivotal volatiles responsible for distinguishing diverse rolling processes. According to their pathways, glycoside-derived volatiles (GDVs) (such as linalool and geraniol) and fatty acid-derived volatiles (FADVs) (such as (Z)-2-hexen-1-ol and hexanal) highlighted the pivotal role in the formation of the aroma of black tea during rolling process. GDVs, characterized by floral, honeyed, and fruity aromas, reached the lowest point at 35-min rolling and subsequently rebounded. FADVs exhibited an ascending trajectory during the initial 15-min rolling, followed by a downward trend. These findings provide invaluable insights into the aroma evolution during the rolling stage, offering strategies for enhancing the aroma quality of Congou black tea.
Keywords: rolling, Black Tea, volatile compounds, GC-E-Nose, GC-MS
Received: 22 May 2024; Accepted: 26 Aug 2024.
Copyright: © 2024 Yang, Wang, Shi, Hu, Wang, Xie, Jiang and Yuan. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence:
Yanqin Yang, Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, China
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