The transesterification/esterification experiments were carried out using anhydrous methanol and sulfuric acid from Sigma-Aldrich at the highest purity available. Standard used for identification and quantification of fatty acid methyl esters (FAMEs) was supplied by Supelco
(37 component FAMEs mix, ref: 47885-U). For the free fatty acid(FFA) analysis, 0.5 M potassium hydroxide volumetric solution was purchased from Fluka.All other solvents and reagents were high performance liquid chromatography grade and analytical reagent grade provided by Sigma-Aldrich