en پژوهشي Research Article The present work is carried out to study the antioxidant potential of ethanolic extract of Alstonia scholaris Linn. ( Apocynaceae ) using various in vitro tests including 1,1-diphenyl-2-picryl-hydrazil (DPPH . ) free radical scavenging, metal ion chelating, hydrogen peroxide scavenging, superoxide anion radical scavenging, and ferric thiocyanate reducing ability. &nbsp; Ethanolic extract of Alstonia scholaris had significant ( p <0.01) (DPPH . ) free radical scavenging (63%), metal ion chelating (74.88%), hydrogen peroxide scavenging (72.28%), superoxide anion radical scavenging (67.66%) and significant ( p <0.05) ferric thiocyanate reducing activities. &nbsp; These various antioxidant activities were compared to standard antioxidants such as butylated hydroxyanisole &nbsp; (BHA), butylated hydroxy toluene (BHT), l- ascorbic acid and a -tocopherol. &nbsp; These results indicate that ethanolic extract of Alstonia scholaris Linn. possess antioxidant property. The results observed were comparable to antioxidant properties of BHA, BHT, l- ascorbic acid and a -tocopherol. 191 0 http://ijpt.iums.ac.ir/browse.php?a_code=A-10-100-141&slc_lang=en&sid=1 Arulmozhi Sinnathambi 1003194753284600454 1003194753284600454 No Papiya Mitra Mazumder 1003194753284600455 1003194753284600455 No Purnima Ashok 1003194753284600456 1003194753284600456 No L. Sathiya Narayanan 1003194753284600457 1003194753284600457 No