Modeling, simulation, and kinetic analysis of a heterogeneous reaction system for the enzymatic conversion of poorly soluble substrate

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We developed a kinetic model that describes a heterogeneous reaction system consisting of a solid substrate suspension for the production of D-amino acid using D-hydantoinase. As a biocatalyst, mass-produced free and whole cell enzymes were used. The heterogeneous reaction system involves dissolution of a solid substrate, enzymatic conversion of the dissolved D-form substrate, spontaneous racemization of an L-form substrate to D-form, and deactivation of the enzyme. In the case of using whole cell enzymes, transfer of the dissolved substrate and product through the cell membrane was considered. The kinetic parameters were determined from experiments, literature data, and by using Marquardt's method of nonlinear regression analysis. The model was simulated using the kinetic parameters and compared with experimental data, and a good agreement was observed between the experimental results and the simulation ones. Factors affecting the kinetics of the heterogeneous reaction system were analyzed on the basis of the kinetic model, and the efficiency of the reaction systems using free and whole cell enzymes was also compared. (C) 1999 John Wiley & Sons, Inc.
Publisher
WILEY-BLACKWELL
Issue Date
1999-08
Language
English
Article Type
Article
Keywords

D-AMINO ACIDS; THERMOSTABLE D-HYDANTOINASE; P-HYDROXYPHENYLGLYCINE PRODUCTION; RECOMBINANT ESCHERICHIA-COLI; MICROBIAL TRANSFORMATION

Citation

BIOTECHNOLOGY AND BIOENGINEERING, v.64, no.3, pp.272 - 283

ISSN
0006-3592
URI
http://hdl.handle.net/10203/13574
Appears in Collection
BS-Journal Papers(저널논문)
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