Carbon Stable Isotope Ratio Analysis

The carbon stable isotope ratio method relies upon differences in the 13C content in the carbon of most common fruit juices on the one hand, and of cane sugar and corn syrup on the other. The figure below shows the distribution of 13C/12C ratios (delta values) of a group of pure Florida orange juices. The arrows in Figure 1 indicate the average values of cane sugar and corn syrup 13C/12C ratios. The narrow range of the distribution allows for sensitive detection of cane sugar and corn syrup and many common fruit juices.

Amino Acids 
Anthocyanin Pigments 
Organic Acids 

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Figure 1