Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 407, Issue 8, Pages 2141-2147Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-014-8294-6
Keywords
Mass spectrometry; Imaging; NALDI; Nanostructure; Silicon nanowires; Lateral resolution
Funding
- Czech Science Foundation [P206/12/1150]
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Nanostructure-assisted laser desorption/ionization (NALDI) has been recognized as a powerful matrix-free mass spectrometry tool ideal for imaging of small molecules. In this report, the NALDI approach was compared with matrix-assisted laser desorption/ionization (MALDI) mass spectrometry in terms of sensitivity, reproducibility, and lateral resolution, which can be achieved in mass spectrometry imaging (MSI) experiments using a Nd:YAG laser. Scanning electron microscopy was used for surface topology analysis and evaluation of a putative surface-enhanced sensitivity effect, which was observed upon reduction of the laser focus. NALDI was identified as a more reproducible technique lacking MSI artifacts arising from distant tissue removal known from MALDI oversampling.
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