Composition Profile
Verified · 2026-09-25- 01Free amino acidsNew-process Jiuqu Hongmei had lower free-amino-acid content than traditional Jiuqu Hongmei, and free amino acids were identified as one of the important chemical indicators distinguishing taste among grades.Dry-leaf sample
- 02Theaflavins / thearubigins / theabrowninsTheaflavins, thearubigins and theabrownins were all identified as important chemical indicators associated with taste differences among Jiuqu Hongmei grades.Dry-leaf sample
The black-tea pigment system is related to differences in liquor color and taste among grades.
- 03Jiuqu Hongmei volatile aroma profileA total of 39 volatile compounds were identified, including geraniol, linalool, phenethyl alcohol, benzyl alcohol, benzaldehyde, phenylacetaldehyde, β-ionone and methyl salicylate. Relative abundances of multiple volatiles changed across grades in newer-process tea.Dry-leaf sample
Geraniol, linalool, phenethyl alcohol and related compounds jointly contribute to fresh, floral and sweet aromatic expression.
Free amino acids, caffeine and theaflavin/thearubigin/theabrownin pigments are associated with processing and grade differences, while one study identified 39 volatile compounds, including geraniol, linalool and phenethyl alcohol among major aroma contributors.

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