Metabolomics Investigation Reveals That 8-C N-Ethyl-2-pyrrolidinone-Substituted Flavan-3-ols Are Potential Marker Compounds of Stored White Teas,Journal of Agricultural and Food Chemistry

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Metabolomics Investigation Reveals That 8-C N-Ethyl-2-pyrrolidinone-Substituted Flavan-3-ols Are Potential Marker Compounds of Stored White Teas
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2018-06-19 00:00:00 , DOI: 10.1021/acs.jafc.8b02038
Weidong Dai ₁ , Junfeng Tan ₁ , Meiling Lu ₂ , Yin Zhu ₁ , Pengliang Li ₁ , Qunhua Peng ₁ , Li Guo ₁ , Yue Zhang ₁ , Dongchao Xie ₁ , Zhengyan Hu ₃ , Zhi Lin ₁

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White teas of different stored ages have varied flavor, bioactivity, and commercial value. In this study, a liquid chromatography–mass spectrometry-based metabolomics investigation revealed that there are distinct differences among the compound patterns of Baihaoyinzhen (BHYZ) and Baimudan (BMD) white teas with various storage durations. The levels of flavan-3-ols, procyanidins, theasinensins, theaflavins, flavonol-O-glycosides, flavone-C-glycosides, and most of the amino acids were reduced after long-term (>4 years) storage. More importantly, 8-C N-ethyl-2-pyrrolidinone-substituted flavan-3-ols (EPSFs), including seven novel compounds discovered in white teas for the first time, were formed from theanine and flavan-3-ols during storage, and their contents were positively correlated with the storage duration. These findings were further confirmed by the linearly increasing formation of EPSFs in reaction solution and BMD white teas stored in an environment-controlled cabinet. In conclusion, EPSFs were detected in white teas for the first time and were discovered as marker compounds and potential indicators for long-term storage of white tea.

中文翻译：

代谢组学研究表明，用8-C N-乙基-2-吡咯烷酮取代的Flavan-3-ols是储存白茶的潜在标志物

不同贮藏年龄的白茶具有不同的风味，生物活性和商业价值。在这项研究中，基于液相色谱-质谱的代谢组学研究表明，在不同保存时间下，白haoyinzhen（BHYZ）和Baimudan（BMD）白茶的复合模式之间存在明显差异。黄烷-3-醇，原花青素，theasinensins，茶黄素的含量，flavonol- ö -glycosides，flavone- Ç -glycosides，而大部分的氨基酸被长期后减少（> 4年）存储。更重要的是，8-C N茶氨酸和黄烷-3-醇在储存过程中形成了-乙基-2-吡咯烷酮取代的黄烷-3-醇（EPSFs），包括首次在白茶中发现的七个新化合物，它们的含量与茶氨酸和黄烷-3-醇呈正相关。储存期限。通过在环境控制柜中存储的反应溶液和BMD白茶中EPSF的线性增加，进一步证实了这些发现。总之，首次在白茶中检测到EPSF，并将其作为标记化合物和长期储存白茶的潜在指标。

更新日期：2018-06-19

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