scholarly journals Detection of Waxy Maize Starch Adulteration in Waxy Rice Cake by Use of Stable Carbon Isotope Ratio Analysis.

1991 ◽  
Vol 38 (9) ◽  
pp. 864-870 ◽  
Author(s):  
Takeshi YASUI
Keyword(s):  
Stable Carbon Isotope ◽  
Carbon Isotope Ratio ◽  
Ratio Analysis ◽  
Maize Starch ◽  
Stable Carbon ◽  
Stable Carbon Isotope Ratio ◽  
Rice Cake ◽  
Waxy Maize ◽  
Waxy Rice ◽  
Isotope Ratio Analysis

Verification of Authenticity of Apple Juice

1982 ◽  
Vol 65 (4) ◽  
pp. 846-849
Author(s):  
Allan R Brause ◽  
Joseph M Raterman
Keyword(s):  
Isotope Ratio ◽  
Apple Juice ◽  
Stable Carbon Isotope ◽  
Carbon Isotope Ratio ◽  
High Fructose Corn Syrup ◽  
Ratio Analysis ◽  
Stable Carbon ◽  
Stable Carbon Isotope Ratio ◽  
High Fructose ◽  
Isotope Ratio Analysis

Abstract A series of instrumental analyses is described for verification of apple juice authenticity. Liquid chromatography is used to determine sugars and individual phenolics, atomic absorption spectroscopy is used to determine potassium, standard AOAC methods are used to test for polyphenolics arid formol indexes, and stable carbon isotope ratio analysis (SCIRA) is used to detect high fructose corn syrup. These tests will identify fraudulent but not poorly processed apple juice.

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.

Sign in / Sign up

Export Citation Format

Share Document