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Geographical variations in the carbon isotope composition of the diet and hair in contemporary man
Author(s) -
Nakamura K.,
Schoeller D. A.,
Winkler F. J.,
Schmidt H.L.
Publication year - 1982
Publication title -
biomedical mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0306-042X
DOI - 10.1002/bms.1200090906
Subject(s) - composition (language) , δ13c , isotopes of carbon , carbon fibers , isotope , isotope analysis , chemistry , stable isotope ratio , environmental chemistry , biology , ecology , total organic carbon , mathematics , philosophy , linguistics , physics , quantum mechanics , composite number , algorithm
Geographic variations in the carbon isotope composition of the human diet and human hair were investigated. The carbon isotopic composition of common foodstufls purchased in Chicago, USA, Tokyo, Japan and Munich, FRG, were determined by combustion and differential isotope ratio mass spectrometry. The dietary protein carbon for the United States (−18.1‰) was calculated to be enriched in 13 C relative to the Japanese (−21.2‰) and the German (−23.6‰) diets. To a large degree, the differences reflected the consumption of corn‐fed animal products in the United States and Japan, as well as seafood in Japan. The carbon isotopic composition of hair (−16.4, −18.0 and −20.4%) for the three respective populations correlated with the calculated values of the dietary protein, but were 2–3% enriched in 13 C. Changes in the isotopic composition of beard hair were shown to record the changes in dietary composition in travelers visiting the respective regions.