The biosynthesis and characterization of poly(β-hydroxyalkanoates) produced by Pseudomonas oleovorans

The biosynthesis of poly( beta -hydroxyalkanoates) (PHA's) by P. oleovorans was carried out by using the sodium salt of n-alkanoic acids as carbon sources. The PHA's produced contained at least two major (>5 mol %) monomer units. That is, depending on the carbon source used, the PHA...

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Bibliographic Details
Published in:Macromolecules 1989-05, Vol.22 (3), p.1106-1115
Main Authors: Gross, Richard A, DeMello, Christopher, Lenz, Robert W, Brandl, Helmut, Fuller, R. Clinton
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Miscellaneous
Physicochemistry of polymers
Synthetic biopolymers
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Summary:The biosynthesis of poly( beta -hydroxyalkanoates) (PHA's) by P. oleovorans was carried out by using the sodium salt of n-alkanoic acids as carbon sources. The PHA's produced contained at least two major (>5 mol %) monomer units. That is, depending on the carbon source used, the PHA's can have n-alkyl pendant groups with chain lengths from methyl to nonyl. Studies by differential scanning calorimetry and X-ray diffraction showed that the PHA's containing predominantly longer side chains (n-pentyl or greater) were crystalline polymers (T sub(m) from 45 to 61 degree C, delta H sub(m) up to 8.3 cal/g), whereas those which contained mostly n-propyl or n-butyl side chains showed little tendency to crystallize. The X-ray diffraction patterns of the longer side chain PHA's suggest that they crystallize with participation of both the main and side chains in a layered packing order.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma00193a018