Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2014.650.658Opuntia Forms]]>YeddesNizar CherifJamila Kalthoum AyadiMalika Trabelsi 52014175The antioxidant activity and the chemical composition of methanol extracts from peel and pulp belonging to two species of Tunisian prickly pears Opuntia ficus indica (spiny and thornless forms) and Opuntia stricta has been studied. The antioxidant capacity was measured by DPPH radical scavenging activity. The Total Phenolic Compound (TPC) and the total flavonoid content were determined by the Folin-Ciocalteu method and colorimetric method, respectively. The phenolic compounds were identified and quantified by High Performance Liquid Chromatography (HPLC) coupled with an electrospray ionization mass spectrometry (ESI-MS). 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