A simple and rapid fluorodensitometric method for the simultaneous determination of 1, 4-dimorpholino-7-phenylpyrido [3, 4-d] pyridazine (DS-511) and its metabolites in urine and bile was established. The biological specimens containing DS-511 and its metabolites were separated into lipophilic and hydrophilic layers by extraction with ethyl acetate. The hydrophilic layer was incubated at 37° for 24 hr with β-glucuronidase and arylsulfatase, then separated again into two layers by a similar extraction procedure. The lipophilic layers were purified by two-dimensional thin-layer chromatography with chloroform-methanol (10 : 1) and ethyl acetate-benzene (3 : 2). The hydrophilic layer was passed through a column of Amberlite XAD-2 (100-200 mesh), eluting with ethanol, and the eluate was purified by stepwise thin-layer chromatography with ethyl acetatebenzene (3 : 2) and chloroform-methanol (2 : 1). After moistening the air-dried chromatogram with 1-butanol, the fluorescent spots were quantitatively determined with a spectrodensitometer in the fluorescence mode. The recoveries and the coefficients of variation (c. v.) with this method were 89-116% (c. v. 6-14%) for lipophilic compounds and 93.0-95.0% (c. v. 5-6%) for hydrophilic compounds at concentrations between 0.1-1.0 μg/ml in biological specimens. This method could be used to analyze biological specimens from rats and dogs after administration of DS-511 and should also be applicable to human specimens.
建立了一种简单快速的荧光密度测定法,用于同时测定尿液和胆汁中的1,4-二
氨基-7-苯基
吡啶并[3,4-d]哒嗪(DS-511)及其代谢产物。用
乙酸乙酯萃取,将含有DS-511及其代谢产物的
生物样本分为亲脂层和亲
水层。将亲
水层在37℃下与β-
葡萄糖醛酸酶和芳基
硫酸酶一起孵育24小时,然后用类似的萃取程序再次分为两层。用
氯仿-
甲醇(10:1)和
乙酸乙酯-苯(3:2)进行二维薄层色谱法纯化亲脂层。将亲
水层通过Amberlite XAD-2(100-200目)柱,用
乙醇洗脱,用
乙酸乙酯-苯(3:2)和
氯仿-
甲醇(2:1)进行逐步薄层色谱法纯化洗脱液。用
1-丁醇润湿风干的色谱图后,用分光密度计在荧光模式下定量测定荧光点。在
生物样本中浓度为0.1-1.0μg/ml时,该方法的回收率和变异系数(CV)分别为:亲脂化合物89-116%(CV 6-14%),亲
水化合物93.0