Effect of oxygen concentration on volatile compounds and their ...
Keemun black tea (KBT) is one of the three world-famous black teas (Xiao, Cao, Zhu, Chen & Niu, 2022). After withering, rolling, fermentation, and drying processes, this tea exhibits aroma characteristics of flowers, honey, and fruit (Kang et al., 2019). Among these processes, fermentation is the key step in forming the flavor quality of KBT.
Effects of polyphenols extracted from Keemun black tea on …
2024年7月19日 · Our results showed that tea polyphenols from KBT significantly induced the expression of CYP 3A11 and PXR in general, inhibited the expression of Cyp1a2 and Cyp2e1 in general, and significantly inhibited the mRNA expression of …
Improving flavor of summer Keemun black tea by solid-state …
2023年5月1日 · The present study aimed to improve the flavor of summer Keemun black tea (KBT) using C. militaris solid-state fermentation. Combined with sensory evaluation, the volatile and non-volatile components of solid-state fermentation of …
An emerging strategy for evaluating the grades of Keemun black tea …
2018年4月25日 · Quantitative analysis and untargeted liquid chromatography mass spectrum (LC–MS) based metabolomics of different grades of Keemun black tea (KBT) were conducted. Quantitative analysis did not show tight correlation between tea grades and contents of polyphenols, but untargeted metabolomics analysis revealed that high-grades KBT were ...
Characterization and Quantitative Comparison of Key Aroma
2022年2月22日 · Keemun black tea (KBT) is a famous black tea produced in Keemun and surrounding regions in China. Its characteristic, complex aroma—known as the Keemun aroma—distinguishes it from other black teas. According to our evaluations, fresh KBTs (FKBT) have a strong sweet aroma with floral notes.
一种基于组合液相色谱-基于Orbitrap质谱的非靶向代谢组学评 …
进行了定量分析和基于非目标液相色谱质谱（LC-MS）的不同等级的Keemun红茶（KBT）的代谢组学。 定量分析未显示茶品级与多酚含量之间的紧密相关性，但非目标代谢组学分析表明，高品位KBT与低品位KBT有所区别。 S线图和变量重要性（VIP）分析得出28种标记化合物，这些化合物负责区分不同等级的KBT。 KBT对α-淀粉酶和α-葡萄糖苷酶的抑制作用与茶叶等级呈正相关，计算出各标记物与抑制率的相关系数。 13种化合物与抗血糖活性呈正相关，而theasinensin A，通 …
Key odorants of - ScienceDirect
2024年8月1日 · Chinese Keemun black tea (KBT) is one of the most renowned black teas worldwide due to its alluring floral/fruity/honey-like odor. However, the key odorants of the so-called Keemun aroma have not been systematically characterized.
Aroma effects of key volatile compounds in Keemun black tea at ...
2022年3月30日 · The present study aimed to explore the relationship between the grade and the characteristic aroma in Keemun black tea (KBT). Headspace solid-phase microextraction (HS-SPME), gas chromatography-mass spectrometry (GC-MS), sensory evaluation, and chemometrics were employed to determine the changes in …
Liang Zhang's lab - ResearchGate
The aim of this study was to investigate the astringent compounds in Keemun congou black tea (KBT) using a combination of mass spectrometry, turbidity analysis, and sensory evaluation.
Targeted and nontargeted metabolomics analysis for determining …
2021年10月15日 · As the famous Chinese black tea, keemun black tea (KBT) is produced by the tea leaves of Camellia sinensis var. sinensis cv. Zhuye. High-grade and low-grade KBTs showed different sensory characteristics and biological activities.