Esterification of 4-methyloctanoic acid with polyethylene glycol at different a(w)

Authors
Heinsman, NWJT Teixeira, A Van der Weide, PLJ Franssen, MCR Van der Padt, A De Groot, A Van 'T Riet, K
Citation
Nwjt. Heinsman et al., Esterification of 4-methyloctanoic acid with polyethylene glycol at different a(w), BIOCATAL B, 19(3), 2001, pp. 181-189
Citations number
25
Categorie Soggetti
Biochemistry & Biophysics
Journal title
BIOCATALYSIS AND BIOTRANSFORMATION
ISSN journal
10242422 → ACNP
Volume
19
Issue
3
Year of publication
2001
Pages
181 - 189
Database
ISI
SICI code
1024-2422(2001)19:3<181:EO4AWP>2.0.ZU;2-I
Abstract
Novozym 435(R) (immobilized Candida antarctica lipase B) was used to esteri fy 4-methyloctanoic acid with polyethylene glycols (PEGs) of different mole cular weights (PEG-600, PEG-3000 and PEG-20000) at different water activiti es. A system composed of 4-methyloctanoic acid and PEG-600 was monophasic, except at a high water activity. Even at a water activity of 0.8, PEG was s till converted to its mono- or diester, which proves the unique character o f PEG. The PEG-esters accumulated in the apolar phase.