Hot electron transfer promotes ion production in plasmonic metal nanostructure assisted laser desorption ionization mass spectrometry

2018 ◽  
Vol 54 (77) ◽  
pp. 10905-10908 ◽  
Author(s):  
Yafeng Li ◽  
Xiaohua Cao ◽  
Lingpeng Zhan ◽  
Jingjuan Xue ◽  
Jiyun Wang ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Electron Transfer ◽  
Laser Desorption ◽  
Ionization Mass ◽  
Laser Desorption Ionization ◽  
Hot Electron ◽  
Desorption Ionization ◽  
Ion Production ◽  
Metal Nanostructure ◽  
Hot Electron Transfer

Experimental evidences are shown that hot electron transfer in LSPR plays a key role in ionizing molecules during laser desorption ionization process.

Enhancing surface-assisted laser desorption ionization mass spectrometry performance by integrating plasmonic hot-electron transfer effect through surface modification

2019 ◽  
Vol 55 (41) ◽  
pp. 5769-5772 ◽  
Author(s):  
Yafeng Li ◽  
Peiqi Luo ◽  
Xiaohua Cao ◽  
Huihui Liu ◽  
Jianing Wang ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Electron Transfer ◽  
Laser Desorption ◽  
Transfer Effect ◽  
Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Laser Desorption Ionization ◽  
Hot Electron ◽  
Desorption Ionization ◽  
Hot Electron Transfer

Surface-assisted laser desorption ionization mass spectrometry (SALDI MS) performances were enhanced by modifying surfaces to include a plasmonic hot-electron transfer effect.

Letter: The Use of 2-[(2E)-3-(4-Tert-Butylphenyl)-2-Methylprop-2-Enylidene]Malononitrile as a Matrix for Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry

2000 ◽  
Vol 6 (1) ◽  
pp. 49-52 ◽  
Author(s):  
Lars Ulmer ◽  
Jochen Mattay ◽  
H. Gregorio Torres-Garcia ◽  
Heinrich Luftmann
Keyword(s):  
Mass Spectrometry ◽  
Laser Desorption ◽  
Ionization Mass ◽  
Radical Anions ◽  
Laser Desorption Ionization ◽  
Desorption Ionization ◽  
Evaporation Energy ◽  
Ion Production ◽  
Matrix Assisted Laser ◽  
Matrix Assisted Laser Desorption

2-[(2 E)-3-(4- tert-butylphenyl)-2-methylprop-2-enylidene]malononitrile (DCTB, dicyano. tert-butyl …) has proven to be an excellent nonprotic matrix for very labile compounds, especially for substituted fullerenes. This is mainly due to its extremely low onset of ion production. This matrix works mainly as an electron transfer agent, i.e. the ions produced are radical anions or cations, respectively. It works equally well to transfer evaporation energy to charged oligomers and with proton labile compounds (not shown here).

scholarly journals Diagnosis of Agglomeration and Crystallinity of Active Pharmaceutical Ingredients in Over the Counter Headache Medication by Electrospray Laser Desorption Ionization Mass Spectrometry Imaging

Molecules ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 610
Author(s):  
Mariann Inga Van Meter ◽  
Salah M. Khan ◽  
Brynne V. Taulbee-Cotton ◽  
Nathan H. Dimmitt ◽  
Nathan D. Hubbard ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectrometry Imaging ◽  
Laser Desorption ◽  
Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Active Pharmaceutical Ingredients ◽  
Laser Desorption Ionization ◽  
Over The Counter ◽  
Pharmaceutical Ingredients ◽  
Desorption Ionization

Agglomeration of active pharmaceutical ingredients (API) in tablets can lead to decreased bioavailability in some enabling formulations. In a previous study, we determined that crystalline APIs can be detected as agglomeration in tablets formulated with amorphous acetaminophen tablets. Multiple method advancements are presented to better resolve agglomeration caused by crystallinity in standard tablets. In this study, we also evaluate three “budget” over-the-counter headache medications (subsequently labeled as brands A, B, and C) for agglomeration of the three APIs in the formulation: Acetaminophen, aspirin, and caffeine. Electrospray laser desorption ionization mass spectrometry imaging (ELDI-MSI) was used to diagnose agglomeration in the tablets by creating molecular images and observing the spatial distributions of the APIs. Brand A had virtually no agglomeration or clustering of the active ingredients. Brand B had extensive clustering of aspirin and caffeine, but acetaminophen was observed in near equal abundance across the tablet. Brand C also had extensive clustering of aspirin and caffeine, and minor clustering of acetaminophen. These results show that agglomeration with active ingredients in over-the-counter tablets can be simultaneously detected using ELDI-MS imaging.

Analysis of microbial lipids deposited on Mars Global Simulant (MGS-1) by geomatrix-assisted laser desorption/ionization-mass spectrometry

2021 ◽  
pp. 1-7
Author(s):  
Alef dos Santos ◽  
Edson Rodrigues-Filho ◽  
Manoel Gustavo Petrucelli Homem
Keyword(s):  
Mass Spectrometry ◽  
Laser Desorption ◽  
Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Laser Desorption Ionization ◽  
Organic Substances ◽  
Microbial Lipids ◽  
Desorption Ionization ◽  
Martian Soil ◽  
Planetary Missions

Abstract Lipids are among the organic substances that can work as biosignatures, indicating life in an environment. We present an experimental investigation concerning analysis of lipids from a microbial source deposited on the Mars Global Simulant (MGS-1) regolith by geomatrix-assisted laser desorption/ionization-mass spectrometry (GALDI-MS). Our results indicate that lipids from intact microbial cells of a black yeast strain can be detected in these mimetic samples of Martian soil. These lipid molecules are predominantly associated with the occurrence of adducts in the GALDI-MS spectra. The results can be helpful in the planning of future planetary missions.

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