Abstract
Ammonolysis of soybean oil into fatty amides is efficiently catalyzed by lipase (Lipozyme). In this study, enzymatic synthesis of fatty amides by ammonolysis of soybean oil and thiourea in an organic solvent was investigated. The highest conversion percentage (94 %) was obtained when the process was carried out for 24 h using thiothiourea to soybean oil ratio of 5.0: 1.0 at 40 ºC. The fatty amides were characterized using Fourier transform infrared (FTIR) spectroscopy, proton nuclear magnetic resonance (1H NMR) technique and elemental analysis. The use of immobilized lipase as the catalyst for the preparation reaction provides an easy isolation of the enzyme from the products and other components in the reaction mixture. This method employed offers several advantages such as renewable of the raw material, simple reaction procedure, environmentally friendly process and high yield of the product.
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