Enzyme and Microbial Technology, Vol.82, 51-57, 2016
Selective production of 1-monocaprin by porcine liver carboxylesterase-catalyzed esterification: Its enzyme kinetics and catalytic performance
Porcine liver carboxylesterase (PLE) belongs to carboxylesterase family (EC 184.108.40.206) as a serine-type esterase. The PLE-catalyzed esterification of capric acid with glycerol in reverse micelles was investigated on the catalytic performance and enzyme kinetics. The most suitable structure of reverse micelles was comprised of isooctane (reaction medium) and bis(2-ethylhexyl) sodium sulfosuccinate (AOT, anionic surfactant) with 0.1 of R-value ([water]/[surfactant]) and 3.0 of G/F-value ([glycerol]/[fatty acid]) for the PLE-catalyzed esterification. In the aspect of regio-selectivity, the PLE mainly produced 1-monocaprin without any other products (di- and/or tricaprins of subsequent reactions). Furthermore, the degree of esterification at equilibrium state (after 4 h from the initiation) was 62.7% under the optimum conditions at pH 7.0 and 60 degrees C. Based on Hanes-Woolf plot, the apparent K-m and V-max values were calculated to be 16.44 mM and 38.91 mu M/min/mg protein, respectively. (C) 2015 Elsevier Inc. All rights reserved.