Biodiesel research has been carried out via transesterification.However,biodiesel products(methyl esters)have not encountered new insights,because feedstocks have been explored and studied.Various optimum conditions on transesterification reaction could produce different methyl ester type with different compound.So,this review describes various oil feedstock that were to find new insights about methyl ester type.The review took the results of study that has been published with experience for 10 years.The results of the study reviewed on the transesterification method,characterization of methyl esters,and its components.The component reviewed and correlated to the literature,structure,and GC-MS analysis.The review can provide challenges for methyl ester research in future research.
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