Protection of biodiesel and oil from degradation by natural antioxidants of Egyptian Jatropha
- 107 Downloads
Residue of methanolic extract of Egyptian Jatropha curcas contains bioactive substances such as phenolic compounds, which succeeded to be used as natural antioxidants for the protection of oils and their corresponding biodiesel against oxidative deterioration. In the present work, the residue of Jatropha roots were extracted with methanol and resulting residues, were investigated regarding their content of total phenolic compounds by folin-Cioalteau assay. Further, the antioxidant activities of the extracts were characterized by the 2,2-diphenyl-1-picrylhydrazyl radical method and proved remarkable results. Oxidation stability of Jatropha oil, used fried oil and olive oil and their corresponding biodiesel obtained by conventional transesterification were tested using thermal oxidation. Natural antioxidants such as (α-trocopherol), synthetic antioxidants as butylated hydroxytoluene and natural Jatropha root extract were used in the present study in comparison to investigate their addition effect on the oxidative stability of oils and their corresponding biodiesel. In the rapied thermal treatment test, results showed that addition of butylated hydroxytoluene 0.25 % was able to stabilize Jatropha oil 6 h, but poorly stabiliz biodiesel. Addition of 0.25 % α-trocopherol to Jatropha oil showed less oxidation stability after 2 h thermal treatment. Crude root extract addition at 0.25% to Jatropha oil showed good stability up to 4 h thermal treatment while addition of root extract at 0.25 % to biodiesel showed better stability up to 6 h thermal treatment. Besides addition of 220 ppm crude root extract to biodiesel was enough sufficient to occure oxidative stabilization. Also Jatropha root residue addition at 400 ppm was effective antioxidant for fresh Jatropha oil.
KeywordsPhenolic compounds Thermal stability Transesterification Vegetable oil
Unable to display preview. Download preview PDF.
- Dunn, R. O., (2001). Alternative jet fuels from vegetable oils. T. ASAE, 44 (6), 1751–1757 (7 pages). Google Scholar
- Gertz, C.; Kochhar, S. P., (2001). A new method to determine oxidative stability of vegetable fats and oils at simulated frying temperature. OCL-Ol Corps Gras Li., 8 (1), 82–88 (7 pages). Google Scholar
- Hui, Y. H., (1996). Bailey’s industrial oil and fat products 5th. Ed., 4, 411.Google Scholar
- Kumara, R.; Sharma, M.; Sinharay, S.; Sarin, R., (2004). Effect of alkyl chain on biodiesel characteristics, SAF Publication No 2004-28-027.Google Scholar
- Mc Cormick, R. L.; Terry, B.; Natarajan, M., (2006). Impact of biodiesel blends on fuel system components durability, SAE Techn. Doc. No. 2006-01-3279.Google Scholar
- Salimon, J.; Abdullah, R., (2008). Physiocochemical properties of Malaysian Jatropha curcas seed oil. Sains Maysiana, 37 (4), 379–382 (4 pages). Google Scholar
- Shahidi, E., (1997). Natural antioxidants: An overview, In: Natural Antioxidants, Chemistry, Health Effects and Applications, Ed. F. Shahidi, AOCS Press Champaign, Illinois, USA, 1–10.Google Scholar
- Van Gepen, J. H.; Hammond, E. G.; Yu, L., Monyem, A. (1997). Determining the influence of contaminants on biodiesel properties, SAE Techn. Doc. No. 971685.Google Scholar
- Waynick, J. A., (2005). Characterization of biodiesel oxidation and oxidation products: CRC Project No. AVFL - 2b. National Renewable Energy Laboratory, NREL/TP -540- 39096.Google Scholar
- Westbrook, S. R., (2005). An evaluation and comparison of test methods to measure the oxidative stability of net biodiesel. Subcontract report. National Renewable Energy Laboratory, NREL/SR-540-38983.Google Scholar