Abstract
Biodiesel tends to oxidation during the time of storage due to chemical structure, makes deterioration of fuel quality. Hence, the presence in feed stock required to gain standard quality for biodiesel commercialization. Natural antioxidant, mainly oryzanol found in rice bran feed stock, have been worked in biodiesel oxidation synergistic without any additional of synthetic antioxidant. In this work, the potential natural antioxidant has been evaluated by the oxidation stability. The biodiesel exhibited oxidation stability gained the induction period at 3 h by Rancimat method. It was found that the concentration of oryzanol above 300 ppm keep the biodiesel from oxidation. Even though very small amount 3 ppm oryzanol was obtained but contribute as cost implication due to antioxidants are costly chemicals. Otherwise adding synthetic antioxidant making high cost on biodiesel storage and utilization.
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