申请人:Abbott Laboratories
公开号:US05096838A1
公开(公告)日:1992-03-17
The present invention provides methods and compositions for assaying biological samples, such as human serum, for barbiturates. In one aspect, analogs of barbiturates derivatized with fluorescein and analogs of barbiturates derivatized with immunogenic polypeptides are provided. The fluorescent analogs are employed as tracers in a competitive homogeneous immunoassay, i.e., a fluorescence polarization immunoassay, for detecting barbiturates. The immunogenic analogs are employed to make anti-barbiturate antiserum of the invention for use in the immunoassay method. Intermediates for preparing the fluorescent and immunogenic analogs are also provided. Further provided are test kits, comprising a fluorescent tracer and an antiserum according to the invention, for analyzing biological samples by fluorescence polarization immunoassay for the presence of a barbiturate. Further, an improvement is provided in immunoassays for analytes in serum, wherein a transfer means, such as a pipette, is used repeatedly to transfer different samples into the assay system. In the improvement, an aqueous solution of specified composition, comprising dimethylsulfoxide and an alkali halide, is used to wash the transfer means between transfers.
本发明提供了一种检测生物样本(如人血清)中巴比妥类的方法和组合物。在其中一个方面,提供了用荧光素衍生物衍生的巴比妥类类似物和用免疫原性多肽衍生的巴比妥类类似物。荧光素衍生物被用作追踪剂,在竞争性均相免疫测定中(即荧光偏振免疫测定),用于检测巴比妥类。免疫原性类似物被用于制备本发明的抗巴比妥酸血清,用于免疫测定方法。还提供了制备荧光素和免疫原性类似物的中间体。此外,还提供了测试工具包,包括荧光追踪剂和本发明的抗血清,用于通过荧光偏振免疫测定分析生物样本中的巴比妥类。此外,提供了一种改进血清中分析物的免疫测定方法,其中使用转移手段(如移液管)反复将不同样本转移到测定系统中。在该改进中,使用了一种指定组成的水溶液,包括二甲基亚砜和碱性卤化物,用于在转移之间清洗转移手段。