The trans-free fatty acid margarine base oil was prepared by the transesterification of palm stearin and soybean oil with Lipozyme TL IM as catalyst, and the triacylglyceride composition,solid fat content and crystallization rate of the transesterification product were analyzed.The results indicated that the triacylglyceride composition of the transesterification product changed significantly, the solid fat content decreased and the crystallization rate increased markedly. The transesterification product contained most β′ crystal by X-ray diffraction analysis and had a wide plastic range by differential scanning calorimetry analysis,which was suitable for preparing margarine. |