Accurate mass measurement by matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry. II. Measurement of negative radical ions using porphyrin and fullerene standard reference materials

2010 ◽  
Vol 24 (20) ◽  
pp. 3052-3056 ◽  
Author(s):  
Zhecheng Shao ◽  
Mark F. Wyatt ◽  
Bridget K. Stein ◽  
A. Gareth Brenton
Keyword(s):  
Mass Spectrometry ◽  
Reference Materials ◽  
Mass Measurement ◽  
Time Of Flight ◽  
Laser Desorption ◽  
Standard Reference Materials ◽  
Radical Ions ◽  
Flight Mass Spectrometry ◽  
Matrix Assisted Laser ◽  
Matrix Assisted Laser Desorption

scholarly journals Characterization of Cryptosporidium parvum by Matrix-Assisted Laser Desorption Ionization–Time of Flight Mass Spectrometry

2000 ◽  
Vol 66 (11) ◽  
pp. 4720-4724 ◽  
Author(s):  
Matthew L. Magnuson ◽  
James H. Owens ◽  
Catherine A. Kelty
Keyword(s):  
Mass Spectrometry ◽  
Cryptosporidium Parvum ◽  
Time Of Flight ◽  
Laser Desorption ◽  
Laser Desorption Ionization ◽  
Ionization Time ◽  
Desorption Ionization ◽  
Flight Mass Spectrometry ◽  
Matrix Assisted Laser ◽  
Matrix Assisted Laser Desorption

ABSTRACT Matrix-assisted laser desorption ionization–time of flight mass spectrometry (MALDI-TOF MS) was used to investigate whole and freeze-thawed Cryptosporidium parvum oocysts. Whole oocysts revealed some mass spectral features. Reproducible patterns of spectral markers and increased sensitivity were obtained after the oocysts were lysed with a freeze-thaw procedure. Spectral-marker patterns forC. parvum were distinguishable from those obtained forCryptosporidium muris. One spectral marker appears specific for the genus, while others appear specific at the species level. Three different C. parvum lots were investigated, and similar spectral markers were observed in each. Disinfection of the oocysts reduced and/or eliminated the patterns of spectral markers.

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