Enzymatic Synthesis of Structured Lipids Using Lipase-Catalyzed Interesterification in Solvent-Free System

Abstract

Structured lipids have gained considerable attention in food, pharmaceutical, and nutraceutical industries due to their tailored nutritional and functional properties. This study investigates the enzymatic synthesis of structured lipids through lipase-catalyzed interesterification in a solvent-free system with emphasis on reaction efficiency, product specificity, and process sustainability. The research focuses on evaluating the influence of reaction temperature, enzyme loading, substrate molar ratio, reaction time, and agitation conditions on lipid modification and structured lipid yield. Experimental analyses demonstrated that lipase catalysts effectively promoted selective fatty acid redistribution between triglyceride molecules, resulting in the formation of structured lipids with improved physicochemical and nutritional characteristics. The solvent-free reaction environment enhanced process safety, reduced environmental impact, and simplified downstream purification compared with conventional chemical interesterification methods. Results indicated that optimized operating conditions significantly improved conversion efficiency and minimized undesirable side reactions such as hydrolysis and oxidation. Kinetic evaluation revealed that enzyme activity and substrate accessibility strongly influence the interesterification process and overall product distribution. The synthesized structured lipids exhibited desirable fatty acid composition and functional properties suitable for specialized dietary and biomedical applications. Furthermore, the enzymatic process demonstrated high selectivity, mild operating conditions, and potential for enzyme reuse, contributing to economically viable and environmentally sustainable production. Comparative assessment with traditional catalytic methods confirmed the advantages of lipase-mediated synthesis in achieving higher product quality and process control.