Analysis of Selenium Forms in Selenium-enriched Rice

Studied the combined forms,contribution and corresponding content of selenium in Selenium-enriched rice by using atomic fluorescence spectrometer.In the study,the linear calibrating curve for selenium was within the range of 4 μg/L-20 μg/L,whose correlative coefficient was 0.999 3,the RSD for total selenium was 0.966 %(n=6),the recovery rate of standard spiking for selenium was 103.12 %.The total selenium content was 206.708 μg/kg,which reached rich selenium standard of 60 μg/kg-300 μg/kg,and organic selenium was the main form storing in the rice,which content was 168.875 μg/kg,accounted for 81.70 % of total selenium,the selenium in protein was the main organic selenium form,whose content was 90.170 μg/kg,accounted for 53.40 %,secondly polysaccharide combined selenium accounted for 9.28 %,RNA combined selenium accounted for 1.86 %,and the other forms of organic selenium accounted for 35.46 %.