Characterization of Polymers by Matrix-Assisted Laser Desorption Ionization-Time of Flight Mass Spectrometry. End Group Determination and Molecular Weight Estimates in Poly(ethylene glycols)

1995 ◽  
Vol 28 (13) ◽  
pp. 4562-4569 ◽  
Author(s):  
Giorgio Montaudo ◽  
Maurizio S. Montaudo ◽  
Concetto Puglisi ◽  
Filippo Samperi
Keyword(s):  
Laser Desorption ◽  
Laser Desorption Ionization ◽  
Ionization Time ◽  
Flight Mass Spectrometry ◽  
Ethylene Glycols ◽  
Poly Ethylene ◽  
End Group ◽  
Matrix Assisted Laser ◽  
Matrix Assisted Laser Desorption

scholarly journals Characterization of Partially Transesterified Poly(β-Hydroxyalkanoate)s by Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry

2001 ◽  
Vol 84 (4) ◽  
pp. 1109-1115 ◽  
Author(s):  
Kamal A Saeed ◽  
Folahan O Ayorinde ◽  
Broderick E Eribo ◽  
Michael Gordon ◽  
Ledelle Collier
Keyword(s):  
Mass Spectrometry ◽  
Laser Desorption ◽  
Laser Desorption Ionization ◽  
Ionization Time ◽  
Desorption Ionization ◽  
Flight Mass Spectrometry ◽  
End Group ◽  
Matrix Assisted Laser ◽  
Matrix Assisted Laser Desorption

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

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