scholarly journals When Other Separation Techniques Fail: Compound-Specific Carbon Isotope Ratio Analysis of Sulfonamide Containing Pharmaceuticals by High-Temperature-Liquid Chromatography-Isotope Ratio Mass Spectrometry

2012 ◽  
Vol 84 (18) ◽  
pp. 7656-7663 ◽  
Author(s):  
Dorothea M. Kujawinski ◽  
Lijun Zhang ◽  
Torsten C. Schmidt ◽  
Maik A. Jochmann
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
High Temperature ◽  
Isotope Ratio ◽  
Carbon Isotope Ratio ◽  
Isotope Ratio Mass Spectrometry ◽  
Ratio Analysis ◽  
Isotope Ratio Analysis ◽  
Temperature Liquid ◽  
Compound Specific Carbon Isotope

Carbon Isotope Ratio Analysis of Steroids by High-Temperature Liquid Chromatography-Isotope Ratio Mass Spectrometry

2014 ◽  
Vol 86 (5) ◽  
pp. 2297-2302 ◽  
Author(s):  
Lijun Zhang ◽  
Mario Thevis ◽  
Thomas Piper ◽  
Maik A. Jochmann ◽  
J. Benjamin Wolbert ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
High Temperature ◽  
Carbon Isotope ◽  
Isotope Ratio ◽  
Carbon Isotope Ratio ◽  
Isotope Ratio Mass Spectrometry ◽  
Ratio Analysis ◽  
Isotope Ratio Analysis ◽  
Temperature Liquid

Isotope ratio analysis of carbon and nitrogen by elemental analyser continuous flow isotope ratio mass spectrometry (EA-CF-IRMS) without the use of a reference gas

2015 ◽  
Vol 30 (1) ◽  
pp. 310-314 ◽  
Author(s):  
L. J. Bay ◽  
S. H. Chan ◽  
T. Walczyk
Keyword(s):  
Mass Spectrometry ◽  
Continuous Flow ◽  
Isotope Ratio ◽  
Isotope Fractionation ◽  
Isotope Ratio Mass Spectrometry ◽  
Nitrogen Isotope ◽  
Ratio Analysis ◽  
New Approach ◽  
Carbon And Nitrogen ◽  
Isotope Ratio Analysis

A new approach to normalize carbon and nitrogen isotope ratios measured by EA-CF-IRMS without using a reference gas for correction of instrumental drifts and instrumental isotope fractionation.

Carbon isotope ratio measurements of glyphosate and AMPA by liquid chromatography coupled to isotope ratio mass spectrometry

2013 ◽  
Vol 405 (9) ◽  
pp. 2869-2878 ◽  
Author(s):  
Dorothea M. Kujawinski ◽  
J. Benjamin Wolbert ◽  
Lijun Zhang ◽  
Maik A. Jochmann ◽  
David Widory ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Carbon Isotope ◽  
Isotope Ratio ◽  
Carbon Isotope Ratio ◽  
Isotope Ratio Mass Spectrometry ◽  
Isotope Ratio Measurements

scholarly journals Deuterium Nuclear Magnetic Resonance Spectroscopy and Stable Carbon Isotope Ratio Analysis/Mass Spectrometry of Certain Monofloral Honeys

2000 ◽  
Vol 83 (6) ◽  
pp. 1401-1409 ◽  
Author(s):  
Sylvie Giraudon ◽  
Marc Danzart ◽  
Marc H Merle
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Isotope Ratio ◽  
Stable Carbon Isotope ◽  
Carbon Isotope Ratio ◽  
Resonance Spectroscopy ◽  
Ratio Analysis ◽  
Stable Carbon ◽  
Stable Carbon Isotope Ratio ◽  
Isotope Ratio Analysis

Abstract Quantitative deuterium nuclear magnetic resonance spectroscopy (NMR) has been used in conjunction with stable carbon isotope ratio analysis/mass spectrometry to refine the detection of sugars that have been added to monofloral honeys. The 13C content of sugars indicates the type of photosynthetic metabolism of the plant that synthesized them; the deuterium content is more characteristic of secondary metabolism and of environmental factors. Consequently, determination of the 13C content of honeys and of proteins extracted from the honeys can be used to detect the addition of C4 plant sugars (cane or corn), but it does not reveal the addition of C3 plant sugars such as beet sugar. Deuterium NMR gives useful information for some monofloral honeys. NMR measurement is performed on ethanol obtained from fermentation of the honey and extracted by distillation. The isotopic composition of the ethanol indicates the nature of the sugars from which it was derived. Various types of monofloral honeys were studied, and the results obtained with commercially available honeys demonstrate the usefulness of isotopic analysis and the need to compile a database of authentic honeys to validate or affirm certain results.

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