In recent years, functional and nutritional oils and fats have commercial interet.Polyunsaturated fatty acids, like eicosapentaenoic acid(EPA) and docosahexenoic acid(DHA) have been reported ...Thesis (Ph. D. in Agriculture)--University of Tsukuba, (A), no. 2285, 2000.3.24Titlepage,Contents,Abbreviations -- Chapter 1. General Introduction -- Chapter 2. Lipase Modification for Interesterification in n-Hexane -- Chapter 3. Reaction Kinetics of Interesterification Using Modified Lipase -- Chapter 4. Development of a Novel Hollow-Fibre Membrane Reactor for Interesterification of Triglycerides and Fatty Acids Using Modified Lipase -- Chapter 5. Interesterification Reaction between Medium and Long Chain Fatty Acid Triglycerides Using Modified Lipase -- Chapter 6. Summary -- References -- Acknowledgement