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Characterization of partially transesterified poly(β-hydroxyalkanoate)s using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry

✍ Scribed by K. A. Saeed; F. O. Ayorinde; B. E. Eribo; M. Gordon; L. Collier

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
91 KB
Volume
13
Category
Article
ISSN
0951-4198

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✦ Synopsis

Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS) was used for the characterization of a partially transesterified poly(b-hydroxyalkanoate), PHA, polymer produced by the bacterial strain Alcaligenes eutrophus using saponified vegetable oils as the sole carbon sources. The transesterification was carried out separately under acidic and basic conditions to obtain PHA oligomers weighing less than 10 kDa. The intact oligomers were detected in their cationized [M Na] and [M K] forms by MALDI-TOFMS. A composition analysis, using the MALDI-TOF spectra, indicate that the oligomers obtained via acid catalysis were terminated with a methyl 3-hydroxybutyrate end group, and those obtained by base catalysis had a methyl crotonate (olefinic) termination. In addition to HB (hydroxy butyrate), the oligomers were found to contain a small percentage of HV (hydroxy valerate). This was independently confirmed using gas chromatography/mass spectrometry (GC/MS). In comparison, the analysis of a commercial PHA polymer, transesterified under identical conditions, only showed the presence of HB, i.e. a pure PHB homopolymer.

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