Qualitative and quantitative analyses of bansyl derivatives of dopamine and some of its metabolites in urine samples by electron impact and field desorption mass spectrometry

1976 ◽  
Vol 48 (11) ◽  
pp. 1572-1575 ◽  
Author(s):  
W. D. Lehmann ◽  
H. D. Beckey ◽  
H. R. Schulten
Keyword(s):  
Mass Spectrometry ◽  
Electron Impact ◽  
Urine Samples ◽  
Field Desorption ◽  
Desorption Mass Spectrometry ◽  
Qualitative And Quantitative ◽  
Field Desorption Mass Spectrometry ◽  
Quantitative Analyses ◽  
Derivatives Of

Cesium Determination in Physiological Fluids and Tissues by Field Desorption Mass Spectrometry≠

1978 ◽  
Vol 33 (3-4) ◽  
pp. 178-183 ◽  
Author(s):  
H.-R. Schulten ◽  
R. Ziskoven ◽  
W. D. Lehmann
Keyword(s):  
Mass Spectrometry ◽  
Heart Cells ◽  
Field Desorption ◽  
Animal Tissues ◽  
Ultratrace Analysis ◽  
Desorption Mass Spectrometry ◽  
Qualitative And Quantitative ◽  
Cesium Ions ◽  
Field Desorption Mass Spectrometry ◽  
High Concentrations

Abstract Quantitative ultratrace analysis (10 nmol to 10 /cmol/1) of cesium in biological samples such as human body fluids and animal tissues is performed without any prior purification or concentration steps. The normal level of cesium ions in heart cells was determined. After poisoning these cells with high concentrations of the alkali cation much higher levels were found inside the cells then had been suggested previously. It is demonstrated that field desorption mass spectrometry is a unique tool for the qualitative and quantitative investigations of metal cations in biological material.

Untersuchung yon Dipeptiden durch Elektronenstoß-und Felddesorptions-Massenspektrometrie / Investigation of Dipeptides by Electron Impact and Field Desorption Mass Spectrometry

1978 ◽  
Vol 33 (7) ◽  
pp. 805-808 ◽  
Author(s):  
I. Lüderwald ◽  
M. Przybylski ◽  
H. Ringsdorf ◽  
D. Silberhorn
Keyword(s):  
Mass Spectrometry ◽  
Electron Impact ◽  
Impact Ionization ◽  
Field Desorption ◽  
Molecular Weight Characteristic ◽  
Desorption Mass Spectrometry ◽  
Combined Application ◽  
Diketopiperazine Formation ◽  
Field Desorption Mass Spectrometry ◽  
Characteristic Fragmentation

AbstractThe combined application of field desorption and electron impact ionization techniques in the mass spectrometry of free dipeptides can be used to obtaine informations about primary structure and molecular weight. Characteristic fragmentation pathways of dipeptides are discribed and the mechanism of diketopiperazine formation is discussed.

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