00000ctm a22000003a 4500 UP-8027390931313988137 Buklod 20170420155121.0 m |o d | ta 170420s xx d r |||| u| (iLib)UPVIS-00045930761 Gift VML/ess 4.20.17 eng LG 993.5 2014 C5 C38 Catalan, Christian A. Antioxidant and antibacterial activities of Alipata (Excoecaria agallocha) leaves. Christian A. Catalan. 2014. ix, 66 leaves pictures, illustrations, computer print-out. Thesis (Undergraduate, Bachelor of Science in Chemistry) College of Arts and Sciences, University of the Philippines Visayas, Miagao, Iloilo. The different solvent extracts (methanol, hexane, dichloromethane, ethyl acetate)of Excoecaria agallocha (Euphorbiaceae) were studied for their antioxidant and antibacterial activities. Using DPPH free radical scavenging assay, all extracts showed strong antioxidant activity. The ethyl acetate extract yielded the highest activity of 90.96 +- 0.17 percent was significantly higher than the other extracts even though it was significantly lower than the standard ascorbic acid. Its IC50 was determined and reported to be 150.89 mg/L. Mean zones of inhibition using paper disc diffusion assay was used to assess the antibacterial activity of Excoecaria agallocha against Escherichia coli and Staphylococcus aureus. Only the antibiotic tetracycline and ethyl lacetate extract showed activity. Since the ethyl lacetate extract obtained positive results from the antioxidant and antibacterial assays, the presence of phytochemicals in the extract were evaluated. Alkaloids, flavonoids, phenols, saponins, steroids, tannins, terpenes, and quinones were present in the ethyl lacetate extract. With these results, the leaves of Excoecaria agallocha especially the ethyl acetate fraction is considered a potential source of antibacterial and antioxidant natural products. Alipata leaves. Excoecaria agallocha. Janagap, Steve J Adviser. UPVIS UPV-ML LG 993.5 2014 C5 C38 Thesis