Determination of Origin of Ephedrine Used as Precursor for Illicit Methamphetamine by Carbon and Nitrogen Stable Isotope Ratio Analysis

2004 ◽  
Vol 76 (14) ◽  
pp. 4233-4236 ◽  
Author(s):  
Naoki Kurashima ◽  
Yukiko Makino ◽  
Setsuko Sekita ◽  
Yasuteru Urano ◽  
Tetsuo Nagano
Keyword(s):  
Stable Isotope ◽  
Isotope Ratio ◽  
Stable Isotope Ratio ◽  
Ratio Analysis ◽  
Nitrogen Stable Isotope ◽  
Carbon And Nitrogen ◽  
Isotope Ratio Analysis ◽  
Stable Isotope Ratio Analysis

scholarly journals Determination of the Geographic Origin of Eel Products by Stable Isotope Ratio Analysis

2014 ◽  
Vol 61 (2) ◽  
pp. 54-61 ◽  
Author(s):  
Maya Isshiki ◽  
Satoru Nakamura ◽  
Yasuharu Takashima ◽  
Shouichi Terada ◽  
Yaeko Suzuki
Keyword(s):  
Stable Isotope ◽  
Isotope Ratio ◽  
Geographic Origin ◽  
Stable Isotope Ratio ◽  
Ratio Analysis ◽  
Isotope Ratio Analysis ◽  
Stable Isotope Ratio Analysis

Stable Isotope Ratio Determination of the Origin of Vanillin in Vanilla Extracts and Its Relationship to Vanillin/Potassium Ratios

1981 ◽  
Vol 64 (5) ◽  
pp. 1149-1153
Author(s):  
Glenn E Martin ◽  
Felipe C Alfonso ◽  
Donald M Figert ◽  
James M Burggraff
Keyword(s):  
Stable Isotope ◽  
Isotope Ratio ◽  
Stable Isotope Ratio ◽  
Potassium Content ◽  
Ratio Analysis ◽  
Isotope Ratio Analysis ◽  
Stable Isotope Ratio Analysis ◽  
Ratio Determination

Abstract A method is described for isolating vanillin from vanilla extract, followed by stable isotope ratio analysis to determine the amount of natural vanillin contained in adulterated vanilla extracts. After the potassium content is determined, the percent Madagascar and/or Java vanilla beans incorporated into the extract may then be approximated from the vanillin/ potassium ratio.

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