Modeling enzymatic kinetic pathways for ring-opening lactone polymerization.

Abstract:

:A unified kinetic pathway for the enzyme-catalyzed polymerization and degradation of poly(ε-caprolactone) was developed. This model tracks the complete distribution of individual chain lengths, both enzyme-bound and in solution, and successfully predicts monomer conversion and the molecular mass distribution as a function of reaction time. As compared to reported experimental data for polymerization reactions, modeled kinetics generate similar trends, with ring-opening rates and water concentration as key factors to controlling molecular mass distributions. Water is critically important by dictating the number of linear chains in solution, shifting the molecular mass distribution at which propagation and degradation equilibrate. For the enzymatic degradation of poly(ε-caprolactone), the final reaction product is also consistent with the equilibrium dictated by the propagation and degradation rates. When the modeling framework described here is used, further experiments can be designed to isolate key reaction steps and provide methods for improving the efficiency of enzyme polymerization.

journal_name

Biomacromolecules

journal_title

Biomacromolecules

authors

Johnson PM,Kundu S,Beers KL

doi

10.1021/bm2009312

subject

Has Abstract

pub_date

2011-09-12 00:00:00

pages

3337-43

issue

9

eissn

1525-7797

issn

1526-4602

journal_volume

12

pub_type

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