Isotopic signature carbon tracing method to discern...

Details Isotopic signature carbon tracing method to discern... Isotopic signature carbon tracing method to discern...

2009-05-29

2011-12-13

Gakh, Yelena G (Department: 1777)

Chemistry: analytical and immunological testing

Nuclear magnetic resonance, electron spin resonance or other...

C436S086000, C436S087000

Reexamination Certificate

active

08076156

ABSTRACT:
A glucosamine sample is analyzed using an isotope ratio mass spectrometer to determine whether the glucosamine sample is corn-based, e.g., vegetable-based, as opposed to shellfish-based. The isotope ratio mass spectrometer yields an isotopic value for δ13C that is compared to a reference isotope value for corn, typically about −12.0%. If there is substantial agreement between the two ratios, then it is known with reasonable certainty that the glucosamine origin is corn and is thus vegetable-based. If there is substantial disagreement between the two ratios, it is known that the glucosamine is not corn-based and is likely shellfish-based. In this fashion, end consumers who cannot consume shellfish-based glucosamine, for reasons of religion or allergy, can purchase glucosamine with greater confidence.

REFERENCES:
Tripp et al. “Single-Compound Isotopic Analysis of Organic Materials in Archaeology”, LC•GC Europe, 2004, v. 17, No. 6, pp. 358-364.
Webb et al. “Diet Quality Influences the δ13C and δ15N of locusts and their biochemical components”, The Journal of Experimental Biology, 1998, v. 201, pp. 2903-2911.
McConnaughey et al. “Carbon isotopes in mollusk shell carbonates”, Geo-Mar Lett, 2008, 28, pp. 287-299.
Haines “Relation between the stable carbon isotope composition of fiddler crabs, plants, and soils in a salt marsh”, http://www.aslo.org/lo/toc/vol—21/issue—6/0880.pdf, 1976, v. 21, issue 6, pp. 880-884.

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