人の食生態系における炭素・窒素同位体の分布 [in Japanese] Carbon and nitrogen isotope abundances in human feeding ecosystem [in Japanese]
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Carbon and nitrogen isotope ratios of human diets and hairs were studied for seven ethnic populations. The protein fraction of Japanese food purchased at Tokyo showed similar δ<sup>13</sup>C and δ<sup>15</sup>N with those of previously reported American foods. Based on representative isotope ratios of food classes, the carbon and nitrogen isotope ratios of human hairs were estimated for each populations. The estimation was illustrative of observed isotopic differences of hairs of examined populations except of Brazilian. A mixing model of plant and animal diets was developed to study the relation between the δ<sup>15</sup>N of hair and the animal protein dependence of each nation. The δ<sup>13</sup>C and δ<sup>15</sup>N of Japanese hairs, from foreign residents or from Edo era (ca.130 years BP), showed quite different values as compared with those of recent native Japanese. These suggest that the carbon and nitrogen isotope ratios of human tissues were characterized mainly by food preferences and the isotope ratios of foods, but not by ethnic factors.
Chikyukagaku 20(2), 79-88, 1987
The Geochemical Society of Japan