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Antioxidant and Anti-inflammatory Activities of Selected Medicinal Plants Containing Phenolic and Flavonoid Compounds

Authors Zhang, Lin; Ravipati, Anjaneya S.; Koyyalamudi, Sundar Rao; Jeong, Sang Chul; Reddy, Narsimha; Smith, Paul T.; Bartlett, John; Shanmugam, Kirubakaran; Muench, Gerald; Wu, Ming Jie

Journal JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY , DEC 14 2011,23:59

DOI 10.1021/jf203146e PubMed 22023309

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-alpha in LPS and IFN-gamma 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 GAB 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-alpha with low IC50 values. These findings suggest that some of the medicinal herbs studied in this paper are good sources of antioxidants.

Species covered 苦参 Sophora flavescens 黄芩 Scutellaria baicalensis 广寄生 Taxillus chinensis 药用大黄 Rheum officinale 十大功劳 Mahonia fortunei 槐 Sophora japonica