Sutrisno Sutrisno, Selva Wahyu Hidayah, Dedek Sukarianingsih, Ihsan Budi Rachman, Rini Retnosari
The research objectives are the antibacterial activity of peanut oil and its derivatives determination. The derivatives are potassium salt (K-salt or K-soap), free fatty acids (FFAs), and fatty acid methyl esters (FAMEs) against Staphylococcus aureus and Escherichia coli bacteria. Peanut oil is a liquid light yellow, having density of 0.9372 g.cm-3, viscosity of 230.88 cSt, boiling point of 188 °C, refractive index of 1.4689, soluble in n-hexane, chloroform, and ethanol, but insoluble in methanol and water. The fatty acid contents are palmitic, and stearic acids of 11.46, 16.14, 67.44, and 4.96% respectively. Synthesized K-salts are solid-state and white, have melting point of 208-217 °C, are soluble in water, ethanol, and methanol, but are insoluble in n-hexane and chloroform. There are two FFAs, namely liquid and soft solid. Liquid FFAs are yellowish-white, have density of 0.9560 g.cm-3, viscosity of 462.17 cSt, boiling point of 192 °C, and refractive index of 1.4683. Soft solid FFAs are yellowish-white, and have melting point of 30-35 °C. The FAMEs are liquid yellowish-white, have density of 0.9009 g.cm-3, viscosity of 23.50 cSt, boiling point of 170 °C, and refractive index of 1.4580. The FFAs (liquid and soft solid) and FAMEs are soluble in ethanol, methanol, chloroform, and n-hexane, yet insoluble in water. FFAs and K-salt are active as antibacterial with MIC < 0.2%. © 2021 Author(s).
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5, Malang, 65145, Indonesia
