Journal
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
Volume 77, Issue 11, Pages 1127-1133Publisher
SPRINGER
DOI: 10.1007/s11746-000-0177-3
Keywords
acidolysis; coating lipid; cocoa butter; Lipozyme IM60; moisture inhibition; transesterification; tristearin
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Triacylglycerols with potential for coating application were prepared by acidolysis of tristearin with lauric and oleic acids using Lipozyme 1M60 lipase in n-hexane. The effects of reaction parameters such as time, temperature, substrate mole ratio, water content, enzyme load, and enzyme reuse were studied. Five-gram scale synthesis was carried out to obtain the melting profile of products by differential scanning calorimetry (DSC). An acceptable melting profile was obtained for the product obtained with a 1:4:1 (tristearin/lauric acid/oleic acid) mole ratio of reactants. The DSC melting peak for this product was 31.4 degreesC. Synthesis of 1200 g of this product was carried out at a 1:4:1 substrate ratio in a stirred tank batch reactor under optimal conditions. The reaction product, purified by short-path distillation, was coated onto crackers and studied for its moisture inhibition ability, under water vapor-saturated atmosphere, in a desiccator over different time intervals. The effectiveness of the synthesized lipid as a coating material was compared against uncoated crackers as a control and with cocoa butter-coated crackers. The synthesized lipid was better in preventing moisture absorption than cocoa butter.
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