Format

Send to

Choose Destination
Anal Chem. 2007 Nov 1;79(21):8098-106. Epub 2007 Sep 27.

Laser ablation electrospray ionization for atmospheric pressure, in vivo, and imaging mass spectrometry.

Author information

1
W. M. Keck Institute for Proteomics Technology and Applications, Department of Chemistry, George Washington University, Washington, DC 20052, USA.

Abstract

Mass spectrometric analysis of biomolecules under ambient conditions promises to enable the in vivo investigation of diverse biochemical changes in organisms with high specificity. Here we report on a novel combination of infrared laser ablation with electrospray ionization (LAESI) as an ambient ion source for mass spectrometry. As a result of the interactions between the ablation plume and the spray, LAESI accomplishes electrospray-like ionization. Without any sample preparation or pretreatment, this technique was capable of detecting a variety of molecular classes and size ranges (up to 66 kDa) with a detection limit of 8 and 25 fmol for verapamil and reserpine, respectively, and quantitation capabilities with a four-decade dynamic range. We demonstrated the utility of LAESI in a broad variety of applications ranging from plant biology to clinical analysis. Proteins, lipids, and metabolites were identified, and antihistamine excretion was followed via the direct analysis of bodily fluids (urine, blood, and serum). We also performed in vivo spatial profiling (on leaf, stem, and root) of metabolites in a French marigold (Tagetes patula) seedling.

PMID:
17900146
DOI:
10.1021/ac071181r
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for American Chemical Society
Loading ...
Support Center