Ortillo, Danilo O.Aglobo, Jastine S.2025-08-052015-05Aglobo, J. S. (2015). Antibacterial activity, antioxidant property and photochemical analysis of crude ethanolic extract from Dalanghita (Citrus nobilis) peels [Undergraduate thesis, University of the Philippines Visayas]. UPV Institutional Repository. https://hdl.handle.net/20.500.14583/241https://hdl.handle.net/20.500.14583/241The crude ethanolic extract of Dalanghita <i>(Citrus nobilis)</i> was studied for their antibacterial activity, antioxidant and phytochemical properties. The DPPH free radical scavenging assay of extracts with varying concentrations showed strong antioxidant activity with a maximum % inhibition of 92.30 at 80.70 ug/mL concentration. The IC50 was calculated to be 26.26 pg/mL against 12.48 ug/mL for Ascorbic acid, the positive control. The antibacterial activity of the extract was determined against <i>Escherichia coli</i> and <i>Staphylococcus aureus</i> by measuring the mean zones of inhibition using the paper disc diffusion assay at different concentration of crude ethanolic extract. The crude ethanol extract at 100% concentration yielded the highest inhibition for <i>E. coli</i> at 21.50±0.50 mm which is comparable to tetracycline, the positive control. The presence of phytochemicals in the extract were evaluated and the phytochemicals identified were: alkaloids, flavonoids, saponins, steroids, tannins, and terpenes.ix, 50 p.CrudeEthanolDalanghitaCitrus nobilisPhytochemicalsLG 993.5 2015 C5 A36ThesiscrudeethanolCitrusphytochemicalsSDG 3 - Good health and well-beingSDG 15 - Life on landSDG 12 - Responsible consumption and production