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Bacterial polyesters containing branched poly(beta-hydroxyalkanoate) units.

K Fritzsche1, R W Lenz, R C Fuller

  • 1Department of Polymer Science and Engineering, University of Massachusetts, Amherst 01003.

International Journal of Biological Macromolecules
|April 1, 1990
PubMed
Summary
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Pseudomonas oleovorans produced novel polyesters from specific methyloctanoate mixtures. These polymers, characterized by pendant methyl branches, exhibited distinct isomeric compositions and molecular weights.

Area of Science:

  • Microbial Polymer Synthesis
  • Biochemistry and Polymer Chemistry

Background:

  • Pseudomonas oleovorans is known for producing polyhydroxyalkanoates (PHAs).
  • Substrate specificity influences PHA composition and properties.
  • Understanding microbial polyester synthesis pathways is crucial for bio-based materials.

Purpose of the Study:

  • To investigate the ability of Pseudomonas oleovorans to synthesize polyesters from various methyloctanoate substrates.
  • To characterize the structure and properties of the resulting polymers, focusing on methyl branching and stereochemistry.
  • To determine the influence of different substrate mixtures on polymer characteristics.

Main Methods:

  • Cultivation of Pseudomonas oleovorans on defined media containing n-octanoate and various methyloctanoates (5-, 6-, and 7-methyloctanoate).

Related Experiment Videos

  • Isolation and purification of synthesized polyesters.
  • Structural characterization using 13C-nuclear magnetic resonance (NMR) spectroscopy to identify monomer units, branching, and diastereomeric composition.
  • Determination of molecular weight and polydispersity using gel permeation chromatography (GPC).

    • Main Results:

    • Polyesters were successfully synthesized from 7-methyloctanoate and its mixtures with n-octanoate, as well as copolymers from 5- and 6-methyloctanoate with n-octanoate.
    • Polymers contained methyl branches in the pendant group, derived from the methyloctanoate substrates.
    • 13C-NMR analysis revealed the presence of two diastereomers in methyl-branched repeating units, with 5-methyloctanoate units showing a higher content of one isomer.
    • Weight average molecular weights ranged from 220,000 to 410,000 g/mol, with polydispersity indices (Mw/Mn) between 1.7 and 1.9.

    Conclusions:

    • Pseudomonas oleovorans can incorporate methyl-branched fatty acids into polyesters, with 7-methyloctanoate being a suitable substrate.
    • The position of the methyl branch influences the diastereomeric composition of the resulting polyester units.
    • The synthesized copolyesters possess moderate molecular weights suitable for potential material applications.