Tea and herbal infusions: Their antioxidant activity and phenolic profile
By A. Atoui, A. Mansouri, George Boskou, P. Kefalas. 2005
830 citations recorded by the source corpus.
Abstract Tea and herbal infusions have been studied for their polyphenolic content, antioxidant activity and phenolic profile. The total phenolics recovered by ethyl acetate from the water extract, were determined by the Folin–Ciocalteu procedure and ranged from 88.1 ± 0.42 (Greek mountain tea) to 1216 ± 32.0 mg (Chinese green tea) GAE (Gallic acid equivalents)/cup. The antioxidant activity was evaluated by two methods, DPPH and chemiluminescence assays, using Trolox and quercetin as standards. The EC 50 of herbal extracts ranged from 0.151 ± 0.002 mg extract/mg DPPH (0.38 quercetin equivalents and 0.57 Trolox equivalents), for Chinese green tea, to 0.77 ± 0.012 mg extract/mg DPPH (0.08 quercetin equivalents and 0.13 Trolox equivalents), for Greek mountain tea. Chemiluminescence assay results showed that the IC 50 ranged from 0.17 ± 3.4 × 10 −3 μg extract/ml of the final solution in the measuring cell (1.89 quercetin and 5.89 Trolox equivalents) for Chinese green tea, to 1.10 ± 1.86 × 10 −2 g extract/ml of the final solution in the measuring cell (0.29 quercetin and 0.90 Trolox equivalents) for Greek mountain tea. The phenolic profile in the herbal infusions was investigated by LC-DAD-MS in the positive electrospray ionization (ESI + ) mode. About 60 different flavonoids, phenolic acids and their derivatives have been identified.
Subfields: Analytical Chemistry, Biochemistry, Pathology and Forensic Medicine
View Paper: https://www.semanticscholar.org/paper/97467729a43d56f21aeb2a8189fbf45a359c2528
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In Biochemistry
Citations in the corpus
- Antioxidant Activities, Total Phenolics and Flavonoids Content in Two Varieties of Malaysia Young Ginger (Zingiber officinale Roscoe) (2010, background): “This concept is supported by increasing evidence indicating that oxidative damage plays a role in the development of chronic, age-related degenerative diseases, and that dietary antioxidants oppose this, thus lowering the risk of disease [4].”
- Flavonoids and phenolic acids: Role and biochemical activity in plants and human (2011, background): “Most pharmaceuticals are based on plant component structures; as such, secondary metabolites enhance human immunity (Atoui et al., 2005).”