Antioxidant Phenolic Compounds from Pu-erh Tea

Molecules

Hai Ming Zhang¹  Cheng Fang Wang¹  Sheng Min Shen¹  Gang Li Wang¹  Peng Liu¹  Zi Mu Liu¹  Yong Yan Wang¹  Shu Shan Du¹  Zhi Long Liu¹ 

[1] ¹State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China

关键词: Pu-erh tea;    DPPH˙;    ABTS˙⁺;    chemical constituent;    antioxidant activity;   

DOI  :  10.3390/molecules171214037

来源: mdpi

【 摘 要 】

Eight compounds were isolated from the water extract of Pu-erh tea and their structures were elucidated by NMR and MS as gallic acid (1), (+)-catechin (2), (−)-epicatechin (3), (−)-epicatechin-3-O-gallate (4), (−)-epigallocatechin-3-O-gallate (5), (−)-epiafzelechin- 3-O-gallate (6), kaempferol (7), and quercetin (8). Their in vitro antioxidant activities were assessed by the DPPH and ABTS scavenging methods with microplate assays. The relative order of DPPH scavenging capacity for these compounds was compound 8 > compound 7 > compound 1 > compound 6 > compound 4 ≈ compound 5 > compound 2 > VC (reference) > compound 3, and that of ABTS scavenging capacity was compound 1 > compound 2 > compound 7 ≈ compound 8 > compound 6 > compound 5 > compound 4 > VC (reference) > compound 3. The results showed that these phenolic compounds contributed to the antioxidant activity of Pu-erh tea.

【 授权许可】

CC BY   
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