作者:Manuel Happe、Martial Kouadio、Christopher Treanor、Jan-Phillip Sawall、Antoine Fornage、Marc Sugnaux、Fabian Fischer
DOI:10.1016/j.molcatb.2014.08.004
日期:2014.11
Size selectivity of Candida antarctica lipase B (CAL-B) was examined in the acylation of pentaerythritol with oleic acid. Biolubricant mixtures consisting of mono-, di-, tri-, and tetraoleates were expected in variable excess. Enzymatic tetraoleate formation was suppressed under solvent conditions; however, this size selectivity was lost without solvent and tetra-acylated pentaerythritol accumulated in up to 93%. The lipase caused size selectivity persisted over a broad temperature range from 35 to 95 degrees C. A Fischer-Speier esterification showed that substrate bulkiness was only a minor contributor to observed size selectivity. All in all, switch on/off size selectivity using CAL-B allowed to vary pentaerythritol biolubricant compositions in an unprecedented manner. (C) 2014 Elsevier B.V. All rights reserved.