诺迪康胶囊中红景天苷含量的测定

目的：本文采用反相高效液相色谱法测定诺迪康胶囊中的红景天苷。方法：建立了以Symmetryshield RPC18柱为固定相，225nm为检测波长，测定红景天苷的液相色谱方法。对流动相的组成、比例和样品提取溶剂进行了优化。结果：使用甲醇-乙腈-水（5：5：90）为流动相，甲醇-水（60：40）为样品提取溶剂，样品的最低检测量为4．33ng，平均回收率约为92％。重复性测定其相对标准偏差低于2．74％。结论：该法准确、简便、快速，适用于红景天类药物及本品质量控制。     

异戊巴比妥选择电极的研制及初步应用

An amobarbital-selective electrode based on amobarbital-triheptyldodecylammonium ionpairs in nitrobenzene was prepared and studied. The electrode showed a linear response to amobarbital anion within 2 × 10^-2～5 × 10^-5M concentration range in 0.1M Na₂CO₃ medium. The slope of the electrode was 57 mV/ decade and the limit of detection was 2 × 10^-5M. The electrode can be used for the determination, of amobarbital in drug-substances by direct potentiometry or potentiometric titration with standard solution of sulfuric acid. Dissociation of electroactive material in liquid ion exchanger is also discussed in the paper.     

异戊巴比妥选择电极的研制及初步应用

异戊巴比妥及其钠盐是巴比妥类重要药物之一,应用较广。这种药物的微量分析方法已有专著论述。异戊巴比妥制剂的分析,国外药典有非水滴定法、萃取重量法和色谱法等;我国药典采用硝酸银溶液滴定法。文献曾报道以苯巴比妥—三烷基甲基铵(R=C_8～C_(11)为电活性物质的苯巴比妥涂丝电极及在苯巴比妥制剂分析中的应用。我们以三庚基十二烷基阳离子与异戊巴比妥阴离子形成的缔合物作电活性物质,制成异戊巴比妥液膜