FU Yifang,HUANG Xin,WANG Yan,et al.Chemical components of tea trichomes of Yunnan black tea[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2026,65(01):111-115.
FU Yifang,HUANG Xin,WANG Yan,et al.Chemical components of tea trichomes of Yunnan black tea[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2026,65(01):111-115. DOI: 10.13471/j.cnki.acta.snus.ZR20250124.
Chemical components of tea trichomes of Yunnan black tea
This paper investigates the chemical constituents of Yunnan black tea trichomes from Fengqing county. Using various chromatographic techniques including silica gel, Sephadex LH-20, C
18
reverse-phase, D101 macroporous adsorption resin column chromatography, and semi-preparative HPLC, ten compounds were isolated from the ethyl acetate fraction of a 95% ethanol extract of Yunnan black tea trichomes. Their structures were identified via spectroscopic methods (NMR, MS, and ECD) as: Caffeine (
1
), gallic acid (
2
), kaempferol (
3
), epicatechin (
4
), (+)-catechin (
5
), isoquercitrin (
6
), (-)-epicatechin-3-gallate (
7
), pyrrolidinone H (
8
), tiliroside (
9
), kaempferol-3-
O
-[2,6-di-
O
-(
E
)-
p
-coumaroyl]-
β
-D-glucopyranoside (
10
), respectively. Preliminary content analysis indicated a relatively high caffeine content (0.64% of dry weight), while tea polyphenols accounted for 0.03% of dry weight, suggesting Yunnan black tea trichomes warrants further development.
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