Portal de Periódicos da CAPES

Artigo Produção Nacional Revisado por pares

BIBTEX RIS

Relative protection factor optimisation of natural antioxidants in biodiesel B100

2015; Elsevier BV; Volume: 80; Linguagem: Inglês

10.1016/j.indcrop.2015.11.034

1872-633X

Kelly Roberta Spacino, Elisângela Tavares da Silva, Karina Gomes Angilelli, Ivanira Moreira, Olívio Fernandes Galão, Dionísio Borsato,

Plant biochemistry and biosynthesis

Soybean oil is currently the most widely used raw material for biodiesel production, but its main fatty acids are unsaturated, which makes the addition of antioxidants necessary. This study used alcoholic extracts of natural antioxidants rosemary, oregano and basil to evaluate the protection factor in biodiesel. The analysis of total phenolics content of the extracts showed that the highest values were found for rosemary extract, followed by oregano and basil. Thermogravimetric analysis indicated that the most stable extract was basil, followed by rosemary and oregano. After drying, the extracts were added to the B100 biodiesel and the samples were subjected to accelerate oxidative stability testing at temperatures of 110, 115, 120 and 125 °C following the experimental simplex–centroid design for mixtures. Through the relationship between the values of induction periods, from the different tests and control, the values of the relative protection factor (RPF) were determined. The multiresponse optimisation of predictive equations showed that the greatest value of the RPF was 3.73 for the test containing 50% of rosemary and 50% of oregano and the lowest was 2.94 for biodiesel containing only basil extract as an antioxidant.