Nguyen Van Dat * , Toshihiro Hirotsu and Shinichi Goto

* Correspondence: Nguyen Van Dat (email:

Main Article Content


One of the major technical issues facing biodiesel is its susceptibility to oxidation which is due to its content of unsaturated fatty acid chains, especially those with bis–allylic methylene moieties. In addition to the presence of air, various other factors influence the oxidation process of biodiesel including presence of light, elevated temperature, as well as extraneous materials such as metals which may be even present in the container material. The overall goal of this work is to evaluate the oxidation stability of Jatropha biodiesel/diesel blends. To achieve this goal, an acid–catalyzed pretreatment followed by a standard transesterification procedure with methanol and potassium methoxide catalyst was untaken to produce Jatropha methyl ester (JME) from Jatropha curcas L. oil (JO) with high acid value of 16.25 mg KOH/g. Analysis of the physicochemical properties has shown JME demonstrated potential as a good candidate for feedstock in biodiesel production because the studied physicochemical properties of JME adequately satisfied the relevant standards for biodiesel quality, with the exception of the kinematic viscosity at 40oC. Also, gas chromatography–mass spectrometry (GC–MS) analytical result showed that fatty acid composition of JO was quite similar to that of conventional oils. Especially, the evaluation of oxidation stability of Jatropha biodiesel/diesel blends was accomplished with respect to the change in the quality after oxidation by bubbling oxygen at elevated temperature as well as oxidation of blend fuels in contact with copper plate. The results demonstrated a strong correlation between biodiesel concentration and blend stability; i.e., the increase in biodiesel concentration results in the lower stability in both cases of the copper strip corrosion test and the accelerated oxidation.
Keywords: Biodiesel, blend, FAME, JME, JO, transesterification

Article Details


Akintayo, E.T., 2004. Characteristics and composition of Parkia biglobbossa and Jatropha curcas oils and cakes. Bioresource Technology, 92(3):307–310.

ASTM D2274, 2005. Standard test method for oxidation stability of distillate fuel oil (Accelerated method). West Conshohocken, PA: ASTM International.

Banerji, R., Chowdhury, A.R., Misra, G., Sudarsanam, G., Verma, S.C., and Srivastava, G.S., 1985. Jatropha seed oils for energy. Biomass, 8(4):277–282.

Benjumea, P., Agudelo, J., and Agudelo, A., 2008. Basic properties of palm oil biodiesel–diesel blends. Fuel 87(10–11):2069–75.

Gadir, W.A., Onsa, T.O., Ali, W.E.M., El Badwi, S.M.A., and Adam, S.E.I., 2003. Comparative toxicity of Croton macrostachys, Jatropha curcas and Piper abyssinica seeds in Nubian goats. Small Ruminant Research 48(1):61–67.

Gandhi, V.M, Cherian, K.M., and Mulky, MJ., 1995. Toxicological studies on Ratanjyot oil. Food and Chemical Toxicology 33(1):39–42.

Gubitz, G.M., Mittelbach, M., and Trabi, M., 1999. Exploitation of the tropical oil seed plant Jatropha curcas L. Bioresource Technology 67:73–82.

Haas, W. and Mittelbach, M., 2000. Detoxification experiments with the seed oil from Jatropha curcas L. Industrial Crops and Products 12:111–118.

Hirota, M., Suttajit, M., Suguri, H., et al., 1988. A new tumor promoter from the seed oil of Jatropha curcas L., an intramolecular diester of 12–deoxy–16–hydroxyphorbol. Cancer Research 48:5800–5804.

Jha, S.K., Fernando, S., and To, S.D.F., 2008. Flame temperature analysis of biodiesel blends and components. Fuel 87:1982–8.

Kandpal, J.B., and Madan, M., 1995. Jatropha curcus: a renewable source of energy for meeting future energy needs. Renewable Energy 6 (2):159–160.

Knothe, G., 2006. Analyzing biodiesel: standards and other methods. J Am Oil Chem Soc 83:823–33.

Knothe, G., and Dunn, R.O., 2003. Dependence of oil stability index of fatty compounds on their structure and concentration and presence of metals. J Am Oil Chem Soc 80:1021–6.

Kumar, M.S., Ramesh, A., and Nagalingam, B., 2003. An experimental comparison of methods to use methanol and Jatropha oil in a compression ignition engine. Biomass and Bioenergy 25:309—318.

Makkar, H.P.S., Aderibigbe, A.O., and Becker, K., 1998. Comparative evaluation of non–toxic and toxic varieties of Jatropha curcas for chemical composition, digestibility, protein degradability and toxic factors. Food Chemistry 62:207–215.

Pramanik, K., 2003. Properties and use of Jatropha curcas oil and diesel fuel blends in compression ignition engine. Renewable Energy 28:239–248.

Sarin, A., Arora, R., Singh, N.P., Sharma, M., and Malhotra, R.K., 2009. Influence of metal contaminants on oxidation stability of Jatropha biodiesel. Energy 34(9):1271–5.

Shah, S., Sharma, A., and Gupta, M.N., 2004. Extraction of oil from Jatropha curcas L. seed kernels by enzyme assisted three phase partitioning. Industrial Crops and Products 20(3):275–279.

Shutt, S.H, Lee, K.T, Kamaruddin, A.H., and Yusup, S., 2010. Reactive Extraction of Jatropha curcas L. Seed for Production of Biodiesel: Process optimization Study. Environ. Sci. Technol. 44(11):4361–4367.

Most read articles by the same author(s)