Determination of antioxidant effects of some plant species wild growing in Turkey

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Abstract
In this study, the antioxidant activity of 50% aqueous methanol extracts of Crataegus tanacetifolia (Lam.) Pers, Crataegus bornmuelleri Zaberi, Crataegus orientalis Pall. ex M.Bieb. var. orientalis, Crataegus szovitsii Pojark, Crataegus curvisepala Lindm., Crataegus monogyna Jacq. subsp. monogyna, Crataegus monogyna Jacq.subsp. azarella (Gris.) Franco, Crataegus micophylla C.Koch, Rosa foetida Herrm., Rosa hemisphaerica J.Herrm., Rosa pulverulenta M.Bieb., Rosa canina L., Rubus discolor Weihe & Nees, Rubus canescens DC. var. canescens, Rubus sanctus Screber, Rubus caesius L., Sorbus umbellata (Desf.) Fritsch var. umbellata, Prunus avium L. (Moench.) and Prunus cerasus L. Mespilus germenica was evaluated by various antioxidant assays, including free radical scavenging, hydrogen peroxide scavenging and metal-chelating activities. The extracts of R. hemisphaerica J.Herrm., P. cerasus L. and R. canina L. showed more stronger free radical scavenging and hydrogen peroxide scavenging activities, and the extracts of R. foetida Herrm. (62.54%) and P. cerasus L. showed stronger metal-chelating activity. The results obtained in the present study indicated that the R. hemisphaerica J.Herrm., P. cerasus L. and R. canina are potential sources of natural antioxidant. These antioxidant properties depend on the concentration of the sample.