【摘 要】
：
A new electrochemical method for the on-line determination of vitamin B1 is presented. Based on dead-stop endpoint biamperometry by using two platinum foil elec
【机 构】
：
Department of Biological and Chemical Engineering, Institute of Analytical Science
论文部分内容阅读
A new electrochemical method for the on-line determination of vitamin B1 is presented. Based on dead-stop endpoint biamperometry by using two platinum foil electrodes with an applied potential difference of 150 mV, vitamin B1can be oxidized by hexacyanoferrate ( Ⅲ ) in a sodium hydroxide medium via a reversible indicating couple Fe( CN)64-/Fe(CN)63-. The cell current is linear with the concentration of vitamin B1 in the concentration range of 4.0×10-6-1.0 × 10-3 mol/L with a detection limit of 8.0×10-7 mol/L(0. 27 μg/mL). Most familiar excipients,ions and vitamins do not interfere with the determination of vitamin B1. The method displays the advantages of simplicity, high efficiency( 180 samples/h), and high selectivity, and is suitable for the determination of vitamin B1 in pharmaceutical preparations.
其他文献
There is a classic experiential rule about 1,2-diol RCR1 (OH) CR1 (OH) R ( R1 = H or methyl), that is,the proton chemical shift of the α-R1 group at the hydrox
We study the eigenstate problem of a kind of three coupled oscillators in a new quantum mechanical representation composed by the spontaneous eigenvectors 〈p,
In this mini-review, the complexity of protein fractionation using ultrafiltration is discussed. The coupling of the system hydrodynamics, boundary layer transp
A new bisxanthone, named bijaponicaxanthone C, was isolated from the whole plant of Hypericum japonicum. The structure was elucidated as 6-[1",5",6"-trihydroxy-
Constructal approach is a recent concept allowing to generate and optimize multi-scale structures, in particular, branching structures, connecting a microscopic
Mesoporous silica was prepared using tetrathoxysilane (TEOS), cetadecyltrimethylammonium bromide (CTAB), aqueous ammonia, acetone and water as silica source, te
The morphologies and the microstructures of the dispersed particles of the cubic phase,which were formed by precursor method, were studied. The freeze-fracture
The title compound 5,7-dimethoxy-(2,4-dichlorophenoxyacetylimino)-2H-1,2,4- thiadiazolo[2,3-a]pyrimidine has been synthesized. In order to investigate the relat
AIM: To investigate the effects of 8-Br-cAMP on differentiation and apoptosis of human esophageal cancer cell line Eca-109, and the related gene expression.METH
利用光外差磁旋转速度调制光谱技术获得了可见光波段(16820～17350 cm-1)Cl2+分子离子的A2Πu-X2Πg电子跃迁吸收光谱.在标识Cl2+及其同位素分子离子谱带的过程中,应用塞曼