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Updated: Aug 8, 2026

Tea Aroma Analysis Based on Solvent-Assisted Flavor Evaporation Enrichment
Published on: May 26, 2023
Industrial-scale processing of Enshi Yulu tea: Steam fixation as the critical step driving flavor formation
Mingjin Li1, Yaowen Wan1, Ruoxin Xu1
1National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops; College of Horticulture and Forestry of Huazhong Agricultural University, Wuhan 430064, China.
Abstract:
The dynamic evolution of flavor metabolites of Enshi Yulu tea (ESYL) during its industrial-scale processing remain unclear. In this study, steam fixation was identified as the critical step driving the transformation of flavor characteristics and quality components. Tea polyphenols, soluble sugars, gallic acid, and several free amino acids were determined as key components affecting the taste characteristics of ESYL. Among the 101 differential metabolites identified, most lipids, alkaloids and their derivatives, coumarins and their derivatives, carbohydrates, theaflavins, and tannins decreased significantly after steam fixation (P < 0.05), while most flavonoids and amino acid derivatives increased. Furthermore, 57 differential metabolites were significantly correlated with taste attributes (P < 0.05). These changes in quality components were mainly attributed to thermal hydrolysis, Strecker degradation, oxidation, etc., collectively contributing to the formation of the mellow and sweet aftertaste and nori-like flavor in ESYL. These results provide new insights into the flavor formation of ESYL.
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