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Karuppusamy S.,Center for Botanical Research | Ravichandran V.,Center for Botanical Research
Edinburgh Journal of Botany

A new species, Hedyotis rajasekaranii Karupp. & Ravichandran (Rubiaceae), is described from the Megamalai Hills of the Western Ghats in Tamil Nadu, southern India. © Trustees of the Royal Botanic Garden Edinburgh (2014). Source

Karuppusamy S.,Center for Botanical Research | Muthuraja G.,Center for Botanical Research
Zeitschrift fur Naturforschung - Section C Journal of Biosciences

The fruits of Heracleum aquilegifolium Wight (Apiaceae) were collected from Western Ghats of the Indian Peninsula. The essential oils were extracted by hydrodistillation. The chemical composition of the essential oils was analysed by gas chromatography and gas chromatography-mass spectrometry (GC-MS). β-Pinene (22.3%), 1,8-cineole (20.3%), and β-phellandrene (12.4%) were the main components of H. aquilegifolium fruit oils. The antioxidant properties of essential oils of H. aquilegifolium were examined by different procedures namely reducing power ability, 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity, nitric oxide radical scavenging activity, hydrogen peroxide scavenging activity, hydroxyl radical scavenging activity, superoxide anion scavenging activity, and metal chelating activity. The antioxidant activities were compared with those of synthetic antioxidants and standard drugs such as butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), ascorbic acid, α-tocopherol, curcumin, and quercetin. The study confi rmed the possible antioxidant potential of essential oils tested with various in vitro antioxidant methods. The presence of monoterpenes in combination with other components in the oils could be responsible for the activity. © 2010 Verlag der Zeitschrift für Naturforschung. Tübingen. Source

Karuppusamy S.,Center for Botanical Research | Muthuraja G.,Center for Botanical Research | Rajasekaran K.M.,Center for Botanical Research
Indian Journal of Natural Products and Resources

Six species of lesser known edible fruits from Western Ghats of India were analysed for their anthocyanin, ascorbic acid, total phenolics and flavonoid levels and their antioxidant activities using the DPPH (2,2-diphenyl-1-picrylhydrazyl) method. The data obtained shown the anthocyanin, ascorbic acid, total phenolics and flavonoid levels were significantly higher in the methanol extract of Mahonia leschenaultii (Wall. ex Wight & Arn.) Takeda fruits. Gaultheria fragrantissima Wall. And Rubus ellipticus Sm. fruits were also found to have significant amount of phytochemicals analyzed. M. leschenaultii fruits had highest antioxidant activity when compared to all other fruit extracts. There was a strong correlation between the content of phytochemicals and antioxidant activities in all fruit extracts in the following decreasing order: M. leschenaultii > G. fragrantissima > R. ellipticus > Grewia tiliaefolia Vahl > Ziziphus rugosa Lam.> Flueggea leucopyrus Willd. Source

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