Antioxidant Phenolic Compounds from Pu-erh Tea
| Autor: | Cheng Fang Wang, Sheng Min Shen, Zi Mu Liu, Gang Li Wang, Zhi-Wei Deng, Hai Ming Zhang, Shu-Shan Du, Zhi Long Liu, Peng Liu, Yong Yan Wang |
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| Rok vydání: | 2012 |
| Předmět: |
Pu-erh tea
DPPH˙ ABTS˙+ chemical constituent antioxidant activity Antioxidant DPPH medicine.medical_treatment Pharmaceutical Science DPPH˙ + Antioxidants Article Analytical Chemistry lcsh:QD241-441 chemistry.chemical_compound lcsh:Organic chemistry Phenols Picrates Drug Discovery medicine Benzothiazoles Gallic acid Physical and Theoretical Chemistry Scavenging Flavonoids ABTS Chromatography Tea Biphenyl Compounds Organic Chemistry Free Radical Scavengers Dpph scavenging chemistry Chemistry (miscellaneous) Molecular Medicine Sulfonic Acids Quercetin Kaempferol Oxidation-Reduction Drugs Chinese Herbal Nuclear chemistry |
| Zdroj: | Molecules Molecules; Volume 17; Issue 12; Pages: 14037-14045 Molecules, Vol 17, Iss 12, Pp 14037-14045 (2012) |
| ISSN: | 1420-3049 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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