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Gas Chromatography/Electron Ionization Mass Spectrometric Analysis of Oligomeric Polyethylene Glycol

Authors: ONIGBINDE ADEBAYO

Publication Type: Journal article

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Abstract

Polyethylene Glycol Monoalkyl Ethers, CxH2x+1 (OC2H4)n OH, (PEGMAE), are polar compounds like Polyethylene Glycols (PEG) and they undergo microbial degradation which produces toxic substances that are potentially dangerous to the environment. Therefore, the purpose of this study is to carry out proper identification and characterization of these compounds. The Electron Ionization (EI) and Chemical Ionization (CI) spectra of various PEGMAE were obtained by Gas Chromatography/Mass Spectrometry (GC/MS) and were used to identify and characterize these compounds. The characteristic cleavages in the EI and CI reactions of PEGMAEs were also studied. The results obtained showed that the methane CI mass spectra of the PEGMAE contain MH+ ions and fragment ions similar to those found in their EI mass spectra. The relative abundances of the MH+ ions are low, variable and increase with increasing sample size across the chromatographic peaks; but do not increase with increasing x or n. The base peaks of the low mass oligomers (xï‚£3) are PEG related (e.g., m/z 45, 59) but those of higher mass oligomers (xï‚³4) include the ion at m/z 63 (HOC2H4OH) H+ or m/z 107 (HO (C2H4O)2 H) H+. There are no (MH-H2O)+ ions or protonated dimer ions (nï‚³2, xï‚³2) in the spectra of PEGMAE. The Relative Molar Sensitivities (RMS) or the Relative Sensitivity per Gram (RSG) increases linearly with molecular polarizabilty or molecular weight with a non-zero intercept.

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ONIGBINDE,A. . (0000). Gas Chromatography/Electron Ionization Mass Spectrometric Analysis of Oligomeric Polyethylene Glycol, 0 (), 0-0.

ONIGBINDE,A. . "Gas Chromatography/Electron Ionization Mass Spectrometric Analysis of Oligomeric Polyethylene Glycol" 0, no (), (0000): 0-0.

ONIGBINDE,A. and . (0000). Gas Chromatography/Electron Ionization Mass Spectrometric Analysis of Oligomeric Polyethylene Glycol, 0 (), pp0-0.

ONIGBINDEA, . Gas Chromatography/Electron Ionization Mass Spectrometric Analysis of Oligomeric Polyethylene Glycol. 0000, 0 ():0-0.

ONIGBINDE,ADEBAYO , . "Gas Chromatography/Electron Ionization Mass Spectrometric Analysis of Oligomeric Polyethylene Glycol", 0 . (0000) : 0-0.

O.ADEBAYO , "Gas Chromatography/Electron Ionization Mass Spectrometric Analysis of Oligomeric Polyethylene Glycol" vol.0, no., pp. 0-0, 0000.

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