Abstract
Biodiesel is an alternative fuel derived from vegetable oils. Biodiesel has the disadvantage of being easily oxidized due to unsaturated bonds. Previous studies have shown that pyrogallol and pure methyl linoleate’s reaction with 2.2 diphenyl-1-picrylhydrazyl (DPPH) to form pyrogallol derivative has been proven to improve the solubility and performance of pyrogallol as an antioxidant in biodiesel. However, the use of pure methyl linoleate is not economical if applied at the industrial scale. In this research, pyrogallol derivative performance using impure methyl linoleate obtained from transesterification of sunflower oil and corn oil, which forms sunflower biodiesel and corn biodiesel, was compared. Based on GCMS, the methyl linoleate content of sunflower biodiesel was 54.13%, and corn biodiesel was 47.27%. FTIR showed a shift in the C-O group’s peak from the base of the biodiesel spectra, which shows the formation of a pyrogallol derivative. LCMS/MS showed m/z values indicating that the compound contained methyl linoleate and pyrogallol dimer. The addition of both compounds showed a low absorbance difference value in UV-Vis, thus have better solubility in biodiesel than pure pyrogallol. The addition of both compounds showed a negative slope of iodine number and a longer induction period than palm oil biodiesel.
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