HIGH PERFORMANCE METAL CHELATE INTERACTION CHROMATOGRAPHY

一种可络合的二乙烯三胺功能固定相 开发了过渡金属离子，并对其在高效液相色谱中的使用进行了评估 分居。合成包括蒸发 醋酸盐缓冲水溶液中的三甲氧基硅丙基单体和 在200摄氏度和0.55托尔的衍生化。可复制表面 在100埃，550埃上得到了3.0摩尔/m平方的覆盖率 M-平方/克二氧化硅。分析柱负载铜(II)、镍(II) 和锌(II)的前沿洗脱过程；对应的穿透体积 用原子吸收分光光度法测定金属摄取率。 采用缓冲水-有机流动相分离 磺胺类抗菌剂，包括磺胺-二氮，磺胺-噻唑， 磺胺嘧啶和磺胺吡啶。经验保留率表达式为 发展了与色层保留相关的：a)静电 酸性磺胺官能团与阳离子的相互作用 固定相，b)二次金属-配体络合物，涉及 溶质的杂环芳香取代基与c)增溶 流动相中相对疏水的溶质。保留权 与有机改性剂的浓度成反比， 缓冲液，一般与洗脱液的pH值成正比。洗脱剂 PH 7.3的磷酸盐缓冲液和50%的甲醇能有效地减少 允许基于金属-配体的保留时的静电相互作用 互动。这项工作是一篇名为 磺胺类药物的静电与金属相互作用色谱学 1991年6月被辩护并被接受。以此为基础的手稿 研究正在进行中。

A diethylenetriamine functional stationary phase, capable of complexing transition metal ions, was developed and evaluated for use in HPLC separations. Synthesis involved evaporation of the trimethoxysilylpropyl-monomer from acetate buffered aqueous solution and derivatization at 200 degrees C and 0.55 torr. Reproducible surface coverages of 3.0 moles/m-squared were obtained on 100-angstrom, 550 m-squared/g silica. Analytical columns were loaded with Cu(II), Ni(II) and Zn(II) by frontal elution process; breakthrough volumes corresponded well with metal uptake determined by atomic absorption spectrophotometry. Buffered aqueous-organic mobile phases were used for separations of sulfonamide antimicrobials that included sulfa-diazine, sulfa-thiazole, sulfa-merazine and sulfa-pyridine. An empirical retention expression was developed that related chromatographic retention to: a) electrostatic interaction of the acidic sulfonamide function with the cationic stationary phase, b) secondary metal-ligand complexations involving the heterocyclic aromatic substituents of the solutes and c) solubilization of the relatively hydrophobic solutes in the mobile phase. Retentions were inversely proportional to concentrations of organic modifier and buffer and were generally directly proportional to eluent pH. An eluent of pH 7.3 phosphate buffer and 50% methanol was effective in minimizing electrostatic interactions while allowing retention based on metal-ligand interactions. This work was the topic of a Ph.D. dissertation, entitled "Electrostatic and Metal Interaction Chromatography of Sulfonamides" that was defended and accepted in June, 1991. A manuscript based on this study is in progress.