Ionization efficiency of α-helical peptides in laser desorption/ionization mass spectrometry

2009 ◽  
Vol 44 (7) ◽  
pp. 1119-1123 ◽  
Author(s):  
Yasushi Shigeri ◽  
Satoshi Fujii ◽  
Ryo Obana ◽  
Yoshihisa Hagihara ◽  
Mamiko Jitosho ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Laser Desorption ◽  
Ionization Efficiency ◽  
Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Laser Desorption Ionization ◽  
Helical Peptides ◽  
Desorption Ionization

scholarly journals Desorption/Ionization Efficiency of Peptides Containing Disulfide Bonds in Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry

2012 ◽  
Vol 28 (3) ◽  
pp. 295 ◽  
Author(s):  
Yasushi SHIGERI ◽  
Satoshi INAZUMI ◽  
Yoshihisa HAGIHARA ◽  
Akikazu YASUDA ◽  
Hideya KAWASAKI ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Disulfide Bonds ◽  
Laser Desorption ◽  
Ionization Efficiency ◽  
Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Laser Desorption Ionization ◽  
Desorption Ionization ◽  
Matrix Assisted Laser ◽  
Matrix Assisted Laser Desorption

Desorption/Ionization Efficiency of Common Amino Acids in Surface-Assisted Laser Desorption/Ionization Mass Spectrometry (SALDI-MS) with Nanostructured Platinum

2012 ◽  
Vol 117 (1) ◽  
pp. 238-245 ◽  
Author(s):  
Syuhei Nitta ◽  
Hideya Kawasaki ◽  
Takashi Suganuma ◽  
Yasushi Shigeri ◽  
Ryuichi Arakawa
Keyword(s):  
Mass Spectrometry ◽  
Amino Acids ◽  
Laser Desorption ◽  
Ionization Efficiency ◽  
Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Laser Desorption Ionization ◽  
Desorption Ionization ◽  
Saldi Ms

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.

Sign in / Sign up

Export Citation Format

Share Document