Antioxidant and anti-inflammatory activities of selected medicinal plants containing phenolic and flavonoid compounds

Zhang, Lin, Ravipati, Anjaneya S., Koyyalamudi, Sundar Rao, Jeong, Sang Chul, Reddy, Narsimha, Smith, Paul T., Bartlett, John, Shanmugam, Kirubakaran, Münch, Gerald, and Wu, Ming Jie (2011) Antioxidant and anti-inflammatory activities of selected medicinal plants containing phenolic and flavonoid compounds. Journal of Agricultural and Food Chemistry, 59 (23). pp. 12361-12367.

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Abstract

The antioxidant, anti-inflammatory, and cytotoxic activities of water and ethanol extracts of 14 Chinese medicinal plants were investigated and also their total phenolics and flavonoid contents measured. The antioxidant activity was evaluated in a biological assay using Saccharomyces cerevisiae, whereas the radical scavenging activity was measured using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) method. Total phenolics and flavonoid contents were estimated by Folin–Ciocalteu and aluminum chloride methods, respectively. The anti-inflammatory activities of the plant extracts were determined by measuring the inhibition of production of nitric oxide (NO) and TNF-α in LPS and IFN-γ activated RAW 264.7 macrophages. Their cytotoxic activities against macrophages were determined by Alamar Blue assay. Four plants, namely, Scutellaria baicalensis, Taxillus chinensis, Rheum officinale, and Sophora japonica, showed significant antioxidant activity in both yeast model and also free radical scavenging methods. The ethanol extract of S. japonica showed highest levels of phenolics and flavonoids (91.33 GAE mg/g and 151.86 QE mg/g, respectively). A positive linear correlation between antioxidant activity and the total phenolics and flavonoid contents indicates that these compounds are likely to be the main antioxidants contributing to the observed activities. Five plant extracts (S. baicalensis, T. chinensis, S. japonica, Mahonia fortunei, and Sophora flavescens) exhibited significant anti-inflammatory activity by in vitro inhibition of the production of NO and TNF-α with low IC50 values. These findings suggest that some of the medicinal herbs studied in this paper are good sources of antioxidants.

Item ID: 21847
Item Type: Article (Refereed Research - C1)
Keywords: medicinal plants; antioxidant activity; anti-inflammatory; phenolics; flavonoids
ISSN: 1520-5118
Date Deposited: 21 May 2012 05:54
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1109 Neurosciences > 110903 Central Nervous System @ 100%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920112 Neurodegenerative Disorders Related to Ageing @ 100%
Citation Count from Web of Science Web of Science 2
Downloads: Total: 3
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