Esterification reactions catalyzed by lipases immobilized in organogels: effect of temperature and substrate diffusion.
Rhizomucor miehei lipase was immobilized in hydroxy(propylmethyl) cellulose or agar gels containing lecithin or AOT microemulsions. The effect of the diffusion of substrates and products to this catalyst was studied, as well as the effect of temperature on the initial rate of ester synthesis. The composition of the gel affects the reaction rate due to mass transport phenomena. The apparent activation energies were higher for the systems based on agar, independently of the microemulsion used, and lower for the systems based on AOT microemulsions, independently of the polymer used.
Zoumpanioti
M
M
Institute of Biological Research and Biotechnology, National Hellenic Research Foundation, Athens, Greece.
Parmaklis
P
P
de María
P Domínguez
PD
Stamatis
H
H
Sinisterra
J V
JV
Xenakis
A
A
D000433:1-Propanol / Q000378:metabolism; D002384:Catalysis; D004058:Diffusion; D004655:Emulsions; D004789:Enzyme Activation; D004800:Enzymes, Immobilized / Q000378:metabolism*; D004951:Esterification; D005782:Gels; D019850:Heptanol / Q000378:metabolism; D065347:Hypromellose Derivatives; D007700:Kinetics; D007850:Lauric Acids / Q000378:metabolism; D054709:Lecithins / Q000378:metabolism; D008049:Lipase / Q000378:metabolism*; D008747:Methylcellulose / Q000031:analogs & derivatives / Q000378:metabolism; D020103:Rhizomucor / Q000201:enzymology*; D013379:Substrate Specificity; D013696:Temperature
D004655:Emulsions; D004800:Enzymes, Immobilized; D005782:Gels; D007850:Lauric Acids; D054709:Lecithins; C030358:lauric acid; D065347:Hypromellose Derivatives; D019850:Heptanol; D008747:Methylcellulose; D000433:1-Propanol; D008049:Lipase