The use of the Oil Extracted from Medicago sativa and Vitis vinifera Seed to Improve the Oxidative Stability of the Biofuel of Biodiesel Type

1 University of Craiova, Faculty of Chemistry, Calea Bucuresti 107i, Craiova 200585, Romania
2 Payment Agency for Rural Development and Fishing, Amaradia 4, Craiova 200585, Romania


DUMITRU, M. G. and D. R. GRECU, 2010. The use of the oil extracted from Medicago sativa and Vitis vinifera seed to improve the oxidative stability of the biofuel of biodiesel type. Bulg. J. Agric. Sci., 16: 227-234

The maintaining of the fuel quality, for biodiesel, in its universal using as alternative fuel depends on the way of achieving its resistance enlargement in oxidation during the storage period.
Through its content in substances with antioxidant properties (a- tocopherol, b-tocopherol, g-tocopherol, vitamin E) the additive obtained from the oil extracted from Medicago sativa and Vitis vinifera seed ensures a good protection of biodiesel during the storage period.
The biodiesel and additivated biodiesel samples were placed in dark bottles and stored at medium room temperature of 23.8 °C for 12 months.
The value of the peroxid Index determined monthly through Hara-Totani method was included between 3.2 and 61.2 mEO2/kg biodiesel for the biodiesel samples respectively 3.1 and 43.6 mEO2/kg biodiesel for the additivated biodiesel.
The induction period determined through Rancimat method was included between 8 and 1.5h for the biodiesel samples respectively 9 and 3 h for the additivated biodiesel.

Key words: biodiesel, oxidation, antioxidants, Vitis vinifera, Medicago sativa

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