Journal
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
Volume 22, Issue 2, Pages 329-338Publisher
SPRINGER
DOI: 10.1007/s13361-010-0024-5
Keywords
Imaging mass spectrometry; Lipid profiling; In situ analysis; MALDI-TOF; Human postmortem brain; Lipid extraction; Lipid separation
Funding
- Spanish Ministry of Education and Science [SAF2007-60211]
- Basque Government [IT-325-07, IT-336-10, IT-440-10, SAI07/46]
- Biscay County Council [DIPE07/05]
- Carlos III Health Institute [FIS PI070628]
- UPV/EHU [GIU07/50]
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Molecular mass images of tissues will be biased if differences in the physicochemical properties of the microenvironment affect the intensity of the spectra. To address this issue, we have performed-by means of MALDI-TOF mass spectrometry-imaging on slices and lipidomic analysis in extracts of frontal cortex, both from the same postmortem tissue samples of human brain. An external calibration was used to achieve a mass accuracy of 10 ppm (1 sigma) in the spectra of the extracts, although the final assignment was based on a comparison with previously reported species. The spectra recorded directly from tissue slices (imaging) show excellent s/n ratios, almost comparable to those obtained from the extracts. In addition, they retain the information about the anatomical distribution of the molecular species present in autopsied frozen tissue. Further comparison between the spectra from lipid extracts devoid of proteins and those recorded directly from the tissue unambiguously show that the differences in lipid composition between gray and white matter observed in the mass images are not an artifact due to microenvironmental influences of each anatomical area on the signal intensity, but real variations in the lipid composition.
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