富硒米中某些化学形态硒含量的测定

Determination of Selenium Contents for Some Chemical Forms in Rice Rich-Selenium

【目的】测定富硒米中某些化学形态硒的含量 ,为将富硒米用于肿瘤预防提供科学根据。【方法】 2 ,3 二氨基萘荧光分析法测定富硒米中总硒、无机硒、有机硒含量 ;CNBr 2 ,3 二氨基萘荧光分析法测定硒蛋氨酸中的硒含量。【结果】夏、秋季收获的富硒米中总硒含量分别为 (2 71± 0 97) μg/g ,(9 87± 1 18) μg/g ,均大大地高于普通米 ,P <0 0 0 1;有机硒含量分别为 2 6 8μg/g ,9 77μg/g ,均占总硒含量的 99%以上 ;富硒米中的有机硒主要成分为硒蛋氨酸 ,含量分别为 (1 45± 0 6 7)μg/g ,(4 96± 0 98) μg/g ,它们占总硒含量的 5 3 5 % ,5 0 5 %。【结论】富硒米中的硒绝大部分是天然有机硒 ,有机硒的主要成分是硒蛋氨酸。

Objective Selenium (Se) contents of some chemical forms as total Se,inorganic Se,organic Se and selenomethionine (SeMet) in rice enriched-Se were determined, in order to provide scientific basis for applying rice enriched-Se to cancer prevention. Methods Fluorometric determination with 2,3-diaminonaphthalene (2,3-DAN) for total Se, inorganic Se and organic Se, and with CNBr-2,3-DAN for SeMet. Results Total Se contents of rice enriched-Se reaping in summer and autumn were (2.71±0.97) μg/g, (9.87±1.18 ) μg/g, respectively, both higher than that of ordinary rice (P<0.001); the organic Se occupying over 99% of total Se were 2.68, 9.77 μg/g, respectively. Main component of the organic Se was SeMet, and its Se content (Se-SeMet) was (1.45±0.67) μg/g for rice enriched-Se reaping in summer, (4.96±0.98) μg/g in autumn,and their contents/total Se contents were 53.5, 50.5 %, respectively. Conclusions Most part of Se in rice enriched-Se was natural organic Se and main component of the organic Se was SeMet.