降解裙带菜多糖对纳米硒的形成与稳定作用

在常温下的降解裙带菜多糖(Degraded Undaria Pinnatifida Charv. Suringer polysaccharide, DUP)水溶液中, 由适当过量的抗坏血酸(Vc)与二氧化硒(SeO2)反应制备纳米单质硒(Se0). 通过共振瑞利散射、激光散射和透射电镜(TEM)研究了DUP对Se0粒径的调控和在液相中的稳定作用. 结果表明, DUP通过控制还原速度和表面修饰而把Se0粒子调节在较窄的粒径分布范围内当Se0浓度为0.0507—3.245 mmol/L时, DUP表面修饰的球状纳米硒的平均粒径稳定地保持在24—65 nm范围内, 4 ℃时可在水溶液中稳定保存1个月.

Formation and Stabilization of Selenium Nano-particles in Aqueous Solution of Undaria Pinnatifida Charv. Suringer Polysaccharide

In aqueous solution of degraded undaria pinnatifida charv. suringer polysaccharide(DUP), excessive L-ascorbic acid(Vc) reacted with selenium dioxide(SeO2) to form selenium nano-particles(Se0) at room temperature. It was characterized by transmission electron microscope(TEM), laser light scattering image and Resonance Rayleigh Scattering(RRS) to study the function of DUP in the modulation and stabilization of selenium nano-particles. The results show that DUP can modulate the reaction rate, modify the surface of selenium particles and control the diameter of selenium particles. When the concentration of Se0 was 0.0507 to 3.245 mmol/L, the average diameter of selenium particles modified by DUP was 24 to 64 nm, and the selenium particles were sphere. The nanometer Se0 sol-gel can be preserved for more than a month in aqueous solution of DUP at 4 ℃.