Spectrophotometric Determination of Cobalt(II) and Cyanocobalamin with Vanillilfluorone and Its Applications
作者:Mitsuru Hoshino、Momoka Matsushita、Megumi Samma、Mamiko Asano、Takako Yamaguchi、Yoshikazu Fujita
DOI:10.1248/cpb.59.721
日期:——
Spectrophotometric determination of cobalt(II) was accomplished with vanillilfluorone (VF) in the presence of dimethylbenzyltetradecylammonium chloride (Zephiramine, Zep). In the determination of cobalt(II), Beer's law was obeyed in the range of 24—470 ng/ml, with an effective molar absorption coefficient (at 575 nm) and relative standard deviation of 1.35×105 l mol−1 cm−1 and 0.66% (n=5), respectively. The composition ratio of the colored complex was determined by the mole ratio and continuous variation methods, and it was found to be Co(II) : VF : Zep=1 : 2 : 4. Analysis of cyanocobalamin by the same procedure showed that cyanocobalamin could be determined in the concentration range of 0.5—0.11 μg/ml using the proposed method.
使用香草荧光素(VF)在二甲基苯基十四烷基铵氯化物(Zephiramine,Zep)存在下对钴(II)的光谱法测定得以实现。在钴(II)的测定中,符合比尔定律的浓度范围为24—470 ng/ml,有效的摩尔吸收系数(在575 nm)为1.35×10^5 l mol−1 cm−1,相对标准偏差为0.66%(n=5)。通过摩尔比和连续变化法确定了有色复合物的组成比,发现其为Co(II) : VF : Zep=1 : 2 : 4。通过相同的程序分析氰钴胺时,显示该方法可以在0.5—0.11 μg/ml的浓度范围内确定氰钴胺。