New insights into mechanisms of material ejection in MALDI mass spectrometry for a wide range of spot sizes.
New insights into mechanisms of material ejection in MALDI mass spectrometry for a wide range of spot sizes.
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DOI:
10.1038/s41598-018-25946-z
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发表时间:
2018-05-17
影响因子:
4.6
通讯作者:
Soltwisch J
中科院分区:
文献类型:
--
作者:
Niehaus M;Soltwisch J
Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) is widely used for the analysis of large biomolecules in numerous applications. The technique utilizes nanosecond-long laser pulses at various spot sizes to eject and ionize large molecules embedded in a highly absorptive chemical matrix. Despite the methods name, ‘molecular desorption’ from the matrix crystal surface is not the sole mechanism discussed for material ejection in MALDI, but additional ablation of larger clusters has been reported. Here we present results on the influence of laser fluence and spot size on the mechanisms of the initial material ejection in MALDI and subsequent plume development. We used a laser-based postionization (MALDI-2) as well as a complementary photoacoustic method to monitor the material ejection step. The photoacoustic data reveal a quasi-thermal sublimation process up to a transition fluence. Above this threshold fluence additional ablation processes are observed. Complementary investigations on plume dynamics by MALDI-2 showed an ejection of predominantly fast particles for desorption conditions while ablation produces considerably slower ejecta. Additionally the presented results revealed a peculiar influence of the spot size on analyte fragmentation as well as plume development and allows for new insights into the unexplained spot size effect reported for MALDI.
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影响因子:
1.8
作者:
Fournier, I;Brunot, A;Bolbach, G
通讯作者:
Bolbach, G
DOI:
10.1016/j.ymeth.2016.03.002
发表时间:
2016-07-15
期刊:
Methods (San Diego, Calif.)
影响因子:
--
作者:
Murray KK;Seneviratne CA;Ghorai S
通讯作者:
Ghorai S
DOI:
10.1007/s13361-013-0792-9
发表时间:
2014-03-01
影响因子:
3.2
作者:
Chu, Kuan Yu;Lee, Sheng;Ni, Chi-Kung
通讯作者:
Ni, Chi-Kung
影响因子:
2
作者:
DEMIREV, P;WESTMAN, A;SIEGBAHN, K
通讯作者:
SIEGBAHN, K
影响因子:
2.3
作者:
Knochenmuss, Richard;Zhigilei, Leonid V.
通讯作者:
Zhigilei, Leonid V.