Effects of Rare Earth on Accumulation of Selenium in Soybean Sprouts
摘要
The selenium-enriched soybean sprouts were prepared by adding selenium and rare earth La3+ into the cultivation solutions. The effect of rare earth La3+ on the accumulation of selenium in soybean sprouts was studied. When the concentration of La3+ was below 6 μg·ml-1, the contents of total selenium and organic selenium were both raised gradually, but decreased when the concentration of La3+ was above 7 μg·ml-1, the same trend occured also in the protein components extracted from selenium-enriched soybean sprouts. The highest selenium content 65.68 μg·g-1, organic selenium content 53.58 μg·g-1 and selenium content of protein 31.57 μg·g-1 were all observed at La3+ concentration of 6 μg·ml-1. It was indicated that La3+ could promote the uptake of selenium in the soybean sprouts at low concentrations. The contents of amino acids in protein were also increased when the concentrations of La3+ was 6 μg·ml-1, especially the contents of glutamic acid and aspartic acid were increased by 4% and 3% respectively.