Carbon and nitrogen stable isotope ratios of diet of the Japanese and diet-hair offset values

The stable isotope ratios of carbon and nitrogen (δ 13 C and δ 15 N) were measured in composite samples of Japanese food and hair. Three hundred eighty-nine foodstuffs were collected in Tokyo and Gunma Prefecture, Japan, in 2020. The foodstuffs were classified into 15 food categories, prepared as us...

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Bibliographic Details
Published in:	Isotopes in environmental and health studies Vol. 57; no. 6; pp. 563 - 575
Main Authors:	Yoshinaga, Jun, Komatsuda, Sayuri, Fujita, Raiki, Amin, Md Hasan Al, Oguri, Tomoko
Format:	Journal Article
Language:	English
Published:	England Taylor & Francis 01-12-2021 Taylor & Francis Ltd
Subjects:	Carbon Carbon Isotopes - analysis Carbon-13 Diet Food Food composition foodstuffs Hair Isotope ratios Japan market basket Mass spectrometry Mass spectroscopy Nitrogen Nitrogen Isotopes - analysis nitrogen-15 Nutrition research Stable isotopes Japan market basket hair nitrogen-15 Japan Carbon-13 foodstuffs diet
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Summary:	The stable isotope ratios of carbon and nitrogen (δ 13 C and δ 15 N) were measured in composite samples of Japanese food and hair. Three hundred eighty-nine foodstuffs were collected in Tokyo and Gunma Prefecture, Japan, in 2020. The foodstuffs were classified into 15 food categories, prepared as usually consumed, and mixed to make 15 composite samples representing each of the food categories. Similarly prepared samples for foodstuffs collected in 2011 and 2015 were also examined. Composite hair samples were collected from a barber shop in Tokyo and a beauty salon in Gunma in 2019. The δ 13 C and δ 15 N values of the food and hair composites were measured by elemental analyzer/isotope ratio mass spectrometry after defatting. The δ 13 C and δ 15 N values of the food composite varied from composite to composite and according to year of collection. The whole-diet δ 13 C values were −21.1, −22.0, and −21.5 ‰ for the 2011, 2015, and 2020 samples, respectively; the δ 15 N values were 5.0, 4.4, and 4.4 ‰, respectively. Diet-hair offset values of δ 13 C and δ 15 N were calculated to be 1.9 and 4.3 ‰ for δ 13 C and δ 15 N, respectively. These offset values will be important for dietary analysis and nutritional research using hair isotope ratios.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1025-6016 1477-2639
DOI:	10.1080/10256016.2021.1990276