TRIM, P. J., DJIDJA, M. C., ATKINSON, S. J., OAKES, K., COLE, L. M., ANDERSON, D. M. G., HART, P. J., FRANCESE, S. and CLENCH, M. R. (2010). Introduction of a 20 kHz Nd:YVO4 laser into a hybrid quadrupole time-of-flight mass spectrometer for MALDI-MS imaging. Analytical and Bioanalytical Chemistry, 397 (8), 3409-3419.Full text not available from this repository.
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.
|Research Institute, Centre or Group:||Biomedical Research Centre|
|Depositing User:||Sarah Ward|
|Date Deposited:||21 Jan 2011 14:40|
|Last Modified:||21 Jan 2011 14:40|
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