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Introduction of a 20 kHz Nd:YVO4 laser into a hybrid quadrupole time-of-flight mass spectrometer for MALDI-MS imaging

By P. J. Trim, M. C. Djidja, S. J. Atkinson, K. Oakes, L. M. Cole, D. M. G. Anderson, P. J. Hart, S. Francese and M. R. Clench

Abstract

A commercial hybrid quadrupole time-of-flight mass spectrometer has been modified for high-speed matrix-assisted laser desorption ionisation (MALDI) imaging using a short-pulse optical technology Nd:YVO4 laser. The laser operating in frequency-tripled mode (lambda=355 nm) is capable of delivering 1.5-ns pulses of energy at up to 8 mu J at 510 kHz and 3 mu J at 20 kHz. Experiments to improve beam homogeneity and reduce laser speckle by mechanical vibration of the fibre-optic laser delivery system are reported along with data from trial and tissue imaging experiments using the modified instrument. The laser appeared to yield best results for MALDI-MS imaging experiments when operating at repetition rates 5-10 kHz. Combining this with raster imaging allowed images of rat brain sections to be recorded in 37 min. Similarly, images of the distribution of peptides in "on-tissue" digest experiments from tumour tissues were recorded in 1 h and 30 min rather than the 8h acquisition time previously used. A brief investigation of targeted protein analysis/imaging by multiple reaction monitoring experiments "on-tissue" is reported. A total of 26 transitions were recorded over a 3-s cycle time and images of abundant proteins were successfully recorded

Publisher: Springer Verlag
Year: 2010
DOI identifier: 10.1007/s00216-010-3874-6
OAI identifier: oai:shura.shu.ac.uk:2991
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