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Polyphenolics Profile, Antioxidant and Radical Scavenging Activity of Leaves and Stem of Raphanus sativus L.

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Abstract

Aerial parts (leaves and stem) of Raphanus sativus, which are usually discarded were found to possess potent antioxidant and radical scavenging activity, as measured by standard antioxidant assays. Methanolic and acetone extracts of R. sativus leaves had total polyphenolic content of 86.16 and 78.77 mg/g dry extract, which were comparable to the traditional rich sources such as green tea and black tea. HPLC identification of polyphenolics indicated the presence of catechin, protocatechuic acid, syringic acid, vanillic acid, ferulic acid, sinapic acid, o-coumaric acid, myricetin, and quercetin in leaves and stem. Among the different extraction solvents, methanolic extract of leaves and stem showed potent reductive capacity, significantly inhibited linoleic acid peroxidation and displayed metal chelating activity. Further, they scavenged free radicals effectively with IC50 (half maximal inhibitory concentration) of 31 and 42 µg/ml for DPPH radical, 23 and 52 µg/ml for superoxide radical, 67 and 197 µg/ml for hydrogen peroxide, and 56 and 62 µg/ml for nitric oxide, respectively. Leaves showed most potent antioxidant and radical scavenging activity as compared to stem, which may be accounted for the high polyphenolic content. Leaves and stem of R. sativus, often under-utilized part of this vegetable, thus possessed considerable amount of polyphenolics. Hence, it should be regarded as a potential source of natural antioxidants and could be effectively employed as an ingredient in health or in functional food.

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Acknowledgement

This study was supported by a funding under the Technology Education Quality Improvement Program (TEQIP) by World Bank to Centre for Biotechnology, Institute of Science and Technology, Jawaharlal Nehru Technological University, Hyderabad, India. The first author acknowledges the financial support from CSIR in the form of a Senior Research Fellowship.

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  1. Centre for Biotechnology, Institute of Science and Technology, Jawaharlal Nehru Technological University, Kukatpally, Hyderabad – 500 085, Andhra Pradesh, India

    Syed Sultan Beevi, Mangamoori Lakshmi Narasu & Bandi Boje Gowda

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  1. Syed Sultan Beevi
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  2. Mangamoori Lakshmi Narasu
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  3. Bandi Boje Gowda
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Correspondence to Mangamoori Lakshmi Narasu.

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Beevi, S.S., Narasu, M.L. & Gowda, B.B. Polyphenolics Profile, Antioxidant and Radical Scavenging Activity of Leaves and Stem of Raphanus sativus L.. Plant Foods Hum Nutr 65, 8–17 (2010). https://doi.org/10.1007/s11130-009-0148-6

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