Guo Xiangyang, Schwab Wilfried, Ho Chi-Tang, Song Chuankui, Wan Xiaochun
College of Tea and Food Science, Xinyang Normal University, Xinyang 464000, China.
National Key Laboratory for Tea Plant Germplasm Innovation and Resource Utilization, Anhui Agricultural University, 130 Changjiang West Road, Hefei, 230036, Anhui, China.
Food Chem X. 2025 Apr 30;27:102507. doi: 10.1016/j.fochx.2025.102507. eCollection 2025 Apr.
Tea processing is vital for aroma formation of large-leaf yellow tea (LYT), yet the volatile compounds during its processing remain poorly understood. Volatile profiles of LYT throughout the processing were characterized by gas chromatography-mass spectrometry and electronic nose (-nose). Distinct differences in volatile compositions were observed among stages, with 178 volatiles identified, dominated by alcohols during processes. Notably, heterocyclic compounds became prominent after full fire processing, during which 30 -containing compounds were newly generated, making a significant shift in the volatile profile. Furthermore, tea samples can be distinguished based on the identified volatiles or the responses of -nose, implying that E-nose is suitable for the detection of volatiles in tea production. Additionally, the aroma-active compounds of LYT were widely different from those of other types of yellow teas, attributed to the unique critical processes involved. These results provide valuable theoretical guidance for the processing and quality control of LYT.
茶叶加工对于大叶黄茶(LYT)香气的形成至关重要,但其加工过程中的挥发性化合物仍鲜为人知。采用气相色谱-质谱联用仪和电子鼻对大叶黄茶加工全过程中的挥发性成分进行了表征。各阶段挥发性成分存在明显差异,共鉴定出178种挥发性物质,加工过程中以醇类为主。值得注意的是,足火加工后杂环化合物变得突出,在此过程中新增了30种含该类化合物,使挥发性成分发生了显著变化。此外,根据鉴定出的挥发性物质或电子鼻的响应可以区分茶叶样品,这意味着电子鼻适用于茶叶生产中挥发性物质的检测。此外,大叶黄茶的香气活性成分与其他类型黄茶的香气活性成分有很大差异,这归因于其所涉及的独特关键工艺。这些结果为大叶黄茶的加工和质量控制提供了有价值的理论指导。
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