Publication details

MALDI MS Imaging at Acquisition Rates Exceeding 100 Pixels per Second

Authors

BEDNAŘÍK Antonín MACHÁLKOVÁ Markéta MOSKOVETS Eugene COUFALÍKOVÁ Kateřina KRÁSENSKÝ Pavel HOUŠKA Pavel KROUPA Jiří NAVRÁTILOVÁ Jarmila ŠMARDA Jan PREISLER Jan

Type Article in Periodical
Magazine / Source Journal of the American Society for Mass Spectrometry
MU Faculty or unit

Faculty of Science

Citation
Web Full Text
Doi http://dx.doi.org/10.1007/s13361-018-2078-8
Keywords Mass spectrometry imaging; Laser beam scanning; MALDI; TOF; MSI; High throughput; Grid ion source; 3D cell aggregates; Spheroids; Colorectal adenocarcinoma
Description 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-m round spot. This permitted the acquisition of high-resolution MS images with a well-defined pixel size at acquisition rates exceeding 100pixel/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 100x100pixels with 10-m lateral resolution was recorded in approximately 70s.
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