Sum frequency generation (SFG) spectroscopy using internal reflection geometrywas employed to investigate the conformational order of octadecanethiol (ODT)monolayer on gold thin films in an electrolyte solution. This approach is convincedto be useful to study the molecular structure on the electrode/solution interfaceunder electrochemical condition.
胡芦巴碱(C7H7NO2)照高效液相色谱法(中国药典2020年版通则0512)测定。色谱条件与系统适用性试验以十八烷基硅烷键合硅胶为填充剂(柱长为100mm,内径为2.1mm,粒径为1.8μm);以甲醇-0.05%十二烷基磺酸钠溶液-冰醋酸(20∶80∶0.1)为流动相;流速为每分钟0.3mL;柱温为30℃;检测波长为265nm。中国药典公示稿提出:火麻仁配方颗粒含量测定中,理论板数按胡芦巴碱峰计算应不低于4000。本次采用高效液相色谱法 (HPLC),选用纳谱分析的ChromCore AQ C18色谱柱对火麻仁配方颗粒含量进行检测