10.22376/ijpbs.2019.10.1.p1-12 Volume 3 Issue 4 2012(October - December) Five Indian medicinal plants namely lessThan i greaterThan Acorus calamus lessThan /i greaterThan L lessThan i greaterThan , lessThan /i greaterThan lessThan i greaterThan Pelargonium graveolens lessThan /i greaterThan L lessThan i greaterThan , lessThan /i greaterThan lessThan i greaterThan Cymbopogon martini lessThan /i greaterThan L, lessThan i greaterThan Cyambopogon nardus lessThan /i greaterThan L and lessThan i greaterThan Cymbopogon citratus lessThan /i greaterThan L. were studied for their enzymatic and non enzymatic free radical scavenging properties. Enzymatic ROS scavengers: superoxide dismutase (SOD) and catalase were observed maximum respectively in lessThan i greaterThan A. calamus lessThan /i greaterThan (3.59±0.22 µ mol/min/mg/protein) and lessThan i greaterThan P. graveolens lessThan /i greaterThan (1195.69±0.012 µ mol/min/mg/protein). However, lessThan i greaterThan C. citratus lessThan /i greaterThan which exhibited lowest SOD activity (0.172±0.022), displayed highest activity of ascorbate peroxidase (2.566±0.254 µ mol/min/mg/protein). The ascorbic acid was found to be highest in lessThan i greaterThan C. martini lessThan /i greaterThan (592.09±0.0961 mg/100g) whereas carotenoids were observed maximum in lessThan i greaterThan A. calamus lessThan /i greaterThan (174.8±3.930mg/100g) plant leaves. The total phenolic content (Folin-Ciocalteu assay) was shown to be highest in lessThan i greaterThan P. graveolens lessThan /i greaterThan leaves (22.27±0.284mg GAE ml lessThan sup greaterThan -1 lessThan /sup greaterThan ) followed by lessThan i greaterThan C. citrates lessThan /i greaterThan , lessThan i greaterThan C. martini lessThan /i greaterThan , lessThan i greaterThan C. nardus lessThan /i greaterThan and lessThan i greaterThan A. calamus lessThan /i greaterThan . The findings indicated promising free radical scavenging activity of the above plants and needs further exploration for their effective use in medicines. VIJAY KUMAR, UMESH KUMAR, MEENAKSHI MISHRA AND VEERU PRAKASH Ascorbic acid, Carotenoids, Reactive Oxygen species, Superoxide dismutase, Total phenol. 511-520