Curr Res Food Sci. 2025 Mar 17;10:101037. doi: 10.1016/j.crfs.2025.101037. eCollection 2025.
ABSTRACT
Fixation methodology serves as the critical determinant in shaping green tea’s multi-dimensional quality attributes; however, the impact of different fixation methods and the corresponding combinations on the overall metabolites and quality of in green tea remains unclear. In this study, non-volatile metabolites (NVMs) and volatile metabolites (VMs) analyses and objective quantitative techniques were used to determine the effects of electromagnetic roller-hot air coupling fixation (ROHF), electromagnetic roller-steam coupling fixation (ROSF), electromagnetic roller-hot air-steam coupling fixation (RHSF), electromagnetic single roller fixation (ROLF), and carding fixation (CDF) on the quality of green tea. Forty-four NVMs, 99 VMs, and 15 flavor objective quantitative indexes were identified, with 12 differential NVMs and 9 differential VMs statistically screened. The green tea processed via ROLF was lustrous and emerald green with a bright and clear liquor; ROSF resulted in low caffeine and flavonoid glycosides contents and an umami (UMS) taste; and RHSF was associated with high trans-β-ionone, hexanal and 1-octen-3-ol levels, with a floral and fresh aroma. These findings provide a precise control scheme for the customized processing of green tea, and promote the upgrading of traditional fixation process to intelligent standardization.
PMID:40207208 | PMC:PMC11981776 | DOI:10.1016/j.crfs.2025.101037
