A sensitive and specific ELISA for an antiarrhythmic drug, pilsicainide, was developed, which is capable of measuring as low as 1.6 ng/ml. Anti-pilsicainide antibody was obtained by immunizing rabbits with pilsicainide conjugated with bovine serum albumin using diazotized N-(3-amino-2,6-dimethylphenyl)-8-pyrrolizidinylacetamide (3-aminopilsicainide). Enzyme labeling of pilsicainide with β-D-galactosidase was similarly performed using a diazotized 3-aminopilsicainide. Cross-reactivity data showed that the antibody well recognizes both the aromatic ring and the pyrrolizidine moieties, and thus specific enough to the structure of pilsicainide. The values for the pilsicainide concentrations detected using this assay were comparable with those detected using HPLC. There was a good correlation between the values determined by the two methods. Moreover, the ELISA was about 30-fold more sensitive in detecting pilsicainide at lower concentrations. Using this assay, drug levels were easily measured in the serum of rabbits after oral administration of pilsicainide at a single dose of 1 mg/kg. The ELISA should be a valuable tool in therapeutic drug monitoring (TDM) and pharmacokinetic studies of pilsicainide.
针对一种
抗心律失常药物--比西
卡因肽--开发了一种灵敏而特异的酶联免疫吸附试验,该试验能够检测低至 1.6 纳克/毫升的比西
卡因肽。用重
氮化 N-(3-
氨基-
2,6-二甲基苯基)-8-
吡咯烷基乙
酰胺(
3-氨基吡咯烷酮)与
牛血清白蛋白共轭的
吡咯烷
酮免疫兔子,可获得抗
吡咯烷
酮抗体。用重
氮化的
3-氨基吡咯烷乙
酰胺对
吡西卡尼与β-
D-半乳糖苷酶进行了类似的酶标记。交叉反应数据显示,
抗体能很好地识别芳香环和
吡咯烷分子,因此对
吡西卡内
酯的结构具有足够的特异性。使用该测定法检测到的
吡西卡内
酯浓度值与使用高效
液相色谱法检测到的浓度值相当。两种方法测定的数值之间有很好的相关性。此外,在检测较低浓度的
吡西卡尼时,ELI
SA 的灵敏度要高出约 30 倍。使用这种检测方法,很容易就能测出兔子口服 1 毫克/千克剂量的
吡西卡尼后血清中的药物浓度。该酶联免疫吸附测定法是治疗药物监测(T
DM)和
吡西凯内
酯药代动力学研究的重要工具。