M. G. DUMITRU1, M. NAGI4, M. E. BUCULEI3, G. D. PICIOREA2, I. D. HITICAS5 and T. STANCIU5
1 University of Craiova, Faculty of Exact Sciences, Department of Chemistry, 200585, Craiova, Romania
2,4 Polytechnical University of Timishoara, Faculty of Mechanics, 300222 Timishoara, Romania
3 University of Craiova, Faculty of Mechanics, 200585 Craiova Romania
DUMITRU, M. G., M. NAGI, M. E. BUCULEI, G. D. PICIOREA, I. D. HITICAS and T. STANCIU, 2013. Use of skin and seed extract from the Lycopersicon esculentum for increasing biodiesel oxidation stability. Bulg. J. Agric. Sci., 19: 1445-1451
This study aims to use carotenoids substances extracted from the skin and seeds of Lycopersicon esculentum at protection of biodiesel from fish oil against oxidative degradation. Oxidation stability is an important parameter widely known as material control and evaluation of different types of oil and the effectiveness of antioxidants. There were formed two sets of samples of biodiesel. A sample without additives and other with additives with 0.1% mixture of 0.1% and 0.1% extract extract seed and skin of Lycopersicon esculentum. Samples were incubated for 4 weeks at 50°C. Weekly, the samples of biodiesel have been determined following parameters: Oxidation Stability, Peroxide value and acidity. Additives samples showed values higher than those without additives oxidation stability range 187-515 min. Toward the samples without additives for 90-450 min. Biodiesel samples without additives show an increase in Peroxide value during storage between 1.5-62.2 mEqO2/kg to the additives of 1.0-39.4 m EqO2/kg. Variation in acidity during storage is between 0.4-1.4 mg KOH/g for samples without additives and 0.36-1.0 mg KOH/g for samples additives.