Abstract
This study aimed to optimize the synthesis of a cosmetic ester (decyl oleate) catalyzed by immobilized lipase from Thermomyces lanuginosus (TLL) on amino-functionalized rice husk silica (Amino–SiO2), i.e. a homemade biocatalyst prepared via ionic adsorption. Functionalized support has been characterized by ATR–FTIR, TGA–DTA, and TEM analyses. The effect of important parameters on ester synthesis has been evaluated through a full factorial design in Central Composite Rotatable Design (CCRD) mode. Under optimal experimental conditions, maximum ester conversion percentage of 87% was observed after 105 and 180min of reaction time in iso-octane and solvent-free systems, respectively. However, similar reaction rates of around 10mM/min were obtained for both reaction systems. Ester synthesis in a solvent-free system is a kinetically controlled process, which has been confirmed by calculating its Damköhler number (Da=7.63×10−5). Reusability tests showed that the biocatalyst retained all of its original activity after eight successive reaction cycles in a solvent-free system. These results show that this homemade biocatalyst can be successfully used in cosmetic ester synthesis through a clean technology process due to its high catalytic activity and reusability.
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