Characterization of 2-methylglyceric acid oligomers in secondary organic aerosol formed from the photooxidation of isoprene using trimethylsilylation and gas chromatography/ion trap mass spectrometry.
Rafal Szmigielski, Jason D Surratt, Reinhilde Vermeylen, Katarzyna Szmigielska, Jesse H Kroll, Nga L Ng, Shane M Murphy, Armin Sorooshian, John H Seinfeld, Magda Claeys
文献索引:J. Mass Spectrom. 42(1) , 101-16, (2007)
全文:HTML全文
摘要
In the present work, we have characterized in detail the chemical structures of secondary organic aerosol (SOA) components that were generated in a smog chamber and result from the photooxidation of isoprene under high-NO(x) conditions typical for a polluted atmosphere. Isoprene high-NO(x) SOA contains 2-methylglyceric acid (2-MG) and oligoester derivatives thereof. Trimethylsilylation, in combination with capillary gas chromatography (GC)/ion trap mass spectrometry (MS) and detailed interpretation of the MS data, allowed structural characterization the polar oxygenated compounds present in isoprene SOA up to 2-MG trimers. GC separation was achieved between 2-MG linear and branched dimers or trimers, as well as between the 2-MG linear dimer and isomeric mono-acetate derivatives thereof. The electron ionization (EI) spectra of the trimethylsilyl derivatives contain a wealth of structural information, including information about the molecular weight (MW), oligoester linkages, terminal carboxylic and hydroxymethyl groups, and esterification sites. Only part of this information can be achieved with a soft ionization technique such as electrospray (ESI) in combination with collision-induced dissociation (CID). The methane chemical ionization (CI) data were used to obtain supporting MW information. Interesting EI spectral differences were observed between the trimethylsilyl derivatives of 2-MG linear and branched dimers or trimers and between 2-MG linear dimer mono-acetate isomers.Copyright 2006 John Wiley & Sons, Ltd.
相关化合物
相关文献:
1999-02-26
[J. Mol. Biol. 286(3) , 829-50, (1999)]
1984-01-01
[Br. J. Pharmacol. 81(1) , 175-81, (1984)]
1991-03-01
[Mol. Gen. Genet. 225(3) , 379-86, (1991)]
1985-11-01
[J. Neurosci. 5(11) , 2839-50, (1985)]
1998-03-01
[J. Neurochem. 70(3) , 993-1000, (1998)]