MALDI MS Imaging at Acquisition Rates Exceeding 100 Pixels per Second
- Masaryk University, Department of Chemistry, Faculty of Science (Czech Republic)
- MassTech Inc. (United States)
- Brno University of Technology, Faculty of Mechanical Engineering (Czech Republic)
- Masaryk University, Department of Experimental Biology, Faculty of Science (Czech Republic)
The practicality of matrix-assisted laser desorption/ionization (MALDI) time-of-flight (TOF) mass spectrometry (MS) applied to molecular imaging of biological tissues is limited by the analysis speed. Typically, a relatively low speed of stop-and-go micromotion of XY stages is considered as a factor substantially reducing the rate with which fresh sample material can be supplied to the laser spot. The sample scan rate in our laboratory-built high-throughput imaging TOF mass spectrometer was significantly improved through the use of a galvanometer-based optical scanner performing fast laser spot repositioning on a target plate. The optical system incorporated into the ion source of our MALDI TOF mass spectrometer allowed focusing the laser beam via a modified grid into a 10-μm round spot. This permitted the acquisition of high-resolution MS images with a well-defined pixel size at acquisition rates exceeding 100 pixel/s. The influence of selected parameters on the total MS imaging time is discussed. The new scanning technique was employed to display the distribution of an antitumor agent in 3D colorectal adenocarcinoma cell aggregates; a single MS image comprising 100 × 100 pixels with 10-μm lateral resolution was recorded in approximately 70 s. .
- OSTI ID:
- 22922862
- Journal Information:
- Journal of the American Society for Mass Spectrometry, Journal Name: Journal of the American Society for Mass Spectrometry Journal Issue: 2 Vol. 30; ISSN 1044-0305; ISSN JAMSEF
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
62 RADIOLOGY AND NUCLEAR MEDICINE
ANIMAL TISSUES
CARCINOMAS
DISTRIBUTION
GALVANOMETERS
IMAGE PROCESSING
IMAGE SCANNERS
ION SOURCES
IONIZATION
LASER RADIATION
MASS SPECTROMETERS
MASS SPECTROSCOPY
OPTICAL EQUIPMENT
OPTICAL SYSTEMS
RESOLUTION
TIME-OF-FLIGHT METHOD