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Related Experiment Video

Updated: Jul 8, 2026

Isolation and Compositional Analysis of Plant Cuticle Lipid Polyester Monomers

Isolation and Compositional Analysis of Plant Cuticle Lipid Polyester Monomers

Published on: November 22, 2015

Cutinase Adsorption to Polyester Surfaces Modulates Dissolved Oligomer Speciation during Enzymatic Depolymerization.

Marc J Foster^1,2, Parker J McClain¹, Annabella S Wardle¹

¹Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

Biomacromolecules

|July 7, 2026

Summary

This summary is machine-generated.

Enzyme adsorption to plastic surfaces influences the types of dissolved oligomers released during polyester breakdown. Lower enzyme concentrations result in larger dissolved plastic fragments, impacting plastic degradation pathways.

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Area of Science:

Biotechnology
Polymer Science
Environmental Science

Background:

Surface-active enzymes like cutinases initiate polyester plastic depolymerization via adsorption.
The impact of enzyme adsorption on the chemical composition of dissolved degradation products is not well understood.

Purpose of the Study:

To investigate how the adsorption of cutinase from *Humicola insolens* (HiC) to polyester surfaces affects dissolved oligomer speciation during poly(butylene succinate) (PBS) and poly(butylene sebacate-co-terephthalate) (PBSeT) depolymerization.

Main Methods:

Utilized inverse and conventional Michaelis-Menten kinetics to quantify enzyme attack site densities (Γ_attack) and catalytic turnover rates (k_cat).
Employed liquid chromatography coupled with mass spectrometry (LC-MS) to analyze the composition of dissolved oligomers.

Main Results:

HiC showed similar attack site densities for PBS and PBSeT, but a significantly higher catalytic turnover rate for PBS (40.8 ± 8.4 s^-1) compared to PBSeT (0.13 ± 0.02 s^-1).
Accumulation of larger oligomers was observed when enzyme-to-plastic ratios were below the determined attack site densities.

Conclusions:

Relative levels of free enzyme significantly influence the composition of dissolved products during enzymatic plastic depolymerization.
Understanding enzyme adsorption dynamics is crucial for optimizing enzymatic strategies for plastic degradation.