Avaliação da atividade antioxidante de extratos vegetais em biodiesel de soja

Abstract

The Biodiesel is a fuel seen as an alternative to diesel coming from petroleum because it does not contain sulfur in its composition and generate low levels of pollution. However, one of the limitations found nowadays for the increase of Biodiesel using in engines is related with the oxidative stability during storage. The goal in this assignment was to analyze the effect of the use of Rosemary (Rosmarinus officinalis L.), mustard (Brassica juncea) and thyme (Thymus vulgaris). Two plant extraction methodologies were used, which initially consisted of a Soxhlet extraction with hexane, using rosemary and most treatments, and another with plant extraction using alcohol, allergy and care as treatment. A preliminary test was performed with mustard extracts and foundations at different doses, with the objective of selecting a product for evaluation over 147 days of storage, in which the rosemary extract at a dose of 10000 ppm was chosen. Then, a dose of 10,000 ppm of rosemary and thyme extracts was evaluated, with the drug appearing in two days, 24 hours and 15 days. Rosemary extract was not effective in increasing the induction period during the storage process, in all the stabilizing effect state. The thyme extract released immediate antioxidant effect, however, indicated the reduction of its potential over time, as well as the intersection of treatments. Rosemary extract, obtained with ethanol, indicated potential over time.