The Effect of Surfactant Formulation and Salam Leaf Extract (Syzygium Polyanthum) on The Durability of Soybean Oil

Abstract

The antioxidants in salam leaf extract have polar properties that affect their effectiveness in oil, thus requiring a surfactant to enhance dispersion. This study aims to investigate the impact of surfactant addition on the dispersion of salam leaf extract antioxidants in soybean oil based on iodine value and free fatty acids. The research involved extracting salam leaves and determining the best formulation with a combination of salam leaf extract and sorbitan monooleate surfactant based on antioxidant activity. The best formulation was then blended into soybean oil, which was subsequently heated discontinuously for 12 hours. The results indicated that the treatment observed based on its antioxidant activity is 0.8% salam leaf extract and 1% Sorbitan monooleate surfactant with IC50 antioxidant activity of 105.4712 ppm and which belongs to the medium category. The analysis were then performed for this treatment in heating I to heating IV iodine number (102.95gI2/100g, 102.38gI2/100g, 102.14gI2/100g, and 101.23gI2/100g respectively) and the free fatty acid (0.0633%, 0.0652%, 0.1163%, and 0.1743%, respectively). The effectiveness of salam leaf extract based on iodine number, peroxide number, and free fatty acid parameters showed that the treatment with the addition of salam leaf extract combined with sorbitan monooleate surfactant gave better results than without the addition of sorbitan monooleate surfactant.