Soybean samples with different Se content were collected from four regions of China, i. e.,Enshi county, Hubei Province (seleniferous region), Beijing (normal), as well as Yanbian county, Jilin Province, and Tianshui county, Gansu Province respectively. Two separate chemical extraction procedures were used to isolate different components of soybean and selenium content in each of them was determined. The results showed that selenium associates mainly with proteins(50 % ～ 60 % ) and specially with water-solu...