A capillary electrophoresis method with UV detection was developed for high sensitively determining genistein. In this method, the online acid barrage stacking was applied. Four key factors influencing the stacking efficiency were systematically optimized. Genistein can be detected within 5 min at the concentration of 10 nmol/L, which was 300 times lower than that from conventional hydrodynamic injection. The repeatability, linear range, and limit of detection of the method were investigated with satisfactory result.
Hai Yan FengXiang Jun LiShu Rong HouNa ZhengZhong Bo HuZhuo Bin Yuan
A series of Nd1-yDyyFe11-xTiMx(M=Mo,Si) alloys have been prepared by arc melting and studied by X-ray diffraction and neutron diffraction.All samples are found to crystallize in the ThMn12-type structure.The lattice parameters a and c and unit cell volume V of Nd0.5Dy0.5Fe11-xTiMox alloys increase linearly with increasing content of Mo(x),while the lattice parameters a and c and unit cell volume V of Nd0.5Dy0.5Fe11-xTiSix alloys decrease linearly with increasing content of Si(x).In NdyDy1-yFe11-xTiMx(M=Mo,Si) compounds,Ti and Mo atoms preferentially occupy the 8i sites and Si atoms preferentially occupy the 8j and 8f sites.Magnetic measurements show that the substitution of Fe by either Mo or Si leads to a decrease in the Curie temperature.
LI XiangJun,ZHENG Na,HU ZhongBo & YUAN ZhuoBin College of Chemistry and Chemical Engineering,Graduate University of Chinese Academy of Sciences,Beijing 100049,China
