Hydrolysis of butteroil by immobilized lipase using a hollow-fiber reactor: Part II. Uniresponse kinetic studies

Autor: Malcata Fx, Charles G. Hill, Clyde H. Amundson
Rok vydání: 1992
Předmět:
Zdroj: Biotechnology and Bioengineering. 39:984-1001
ISSN: 1097-0290
0006-3592
Popis: A lipase from Aspergillus niger immobilized by adsorption on microporous, polypropylene hollow fibers was used to effect the hydrolysis of the glycerides of melted butterfat at 40 degrees C and pH 7.0. Mcllvane buffer was pumped through the lumen and melted butterfat was pumped cocurrently through the shell side of a shell-and-tube reactor. Nonlinear regression methods were employed to determine the kinetic parameters of three nested rate expressions derived from a Ping Pong Bi Bi enzymatic mechanism coupled with three nested rate expressions for the thermal deactivation of the enzyme. For the reaction conditions used in this research, a four-parameter rate expression (which includes a two-parameter deactivation rate expression and a two-parameter hydrolysis rate expression) is sufficient to model the overall release of free fatty acids from the triglycerides of butterfat as a function of space time and time elapsed after immobilization. At a space time of 3.7 h immediately after immobilization of lipase, 50% of the fatty acid residues esterified in the sn-1,3 positions of the triglycerides can be released in the hollow-fiber reactor.
Databáze: OpenAIRE
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