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The δ18O-value of the p-OH group of L-tyrosine permits the assignment of its origin to plant or animal sources

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons62603

Werner,  R. A.
Service Facility Stable Isotope/Gas Analytics, Dr. W. A. Brand, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Citation

Fronza, G., Fuganti, C., Schmidt, H.-L., & Werner, R. A. (2002). The δ18O-value of the p-OH group of L-tyrosine permits the assignment of its origin to plant or animal sources. European Food Research and Technology, 215(1), 55-58.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-CEE3-9
Abstract
dThe biosynthesis of L-tyrosine in plants by the shikimate pathway via arogenate implies that the oxygen atom in the p- position originates from D-erythrose with a delta(18)O-value near +30parts per thousand above leaf water, while its synthesis in animals by hydroxylation of external L- phenylalanine with O-2 as oxygen source and a kinetic isotope effect k(16)/k(18)congruent to1.018 demands a delta(18)O-value near +6parts per thousand. These expectations are fully confirmed by experimental data from the 180-pattern analysis of natural aromatic compounds. The result is considered as a basis for the assignment of L-tyrosine and L-tyrosine-derived material of plant or animal origin, respectively, and for the determination of the relative amounts of plant and animal material in food and animal feed.