Compounds are provided for use in assays of organic compounds, where organic compounds of biological interest are determined at extremely low concentrations by combining in a medium, the composition to be determined, hereinafter referred to as ligand, a high molecular weight material of at least 10,000 molecular weight, which has a site spatially characteristic of the ligand, hereinafter referred to as receptor, and an analog of the ligand having a free radical functionality, hereinafter referred to as "ligand analog". The ligand analog and ligand in the medium compete for the receptor site, the amount of ligand analog bound to the receptor, being dependent on the amount of ligand present in the medium. By following the change in electron spin resonance spectrum of the ligand analog and comparing it to the change in spectrum which would be obtained in the absence of any ligand, the amount of ligand can be determined.
化合物可用于有机化合物的测定中,其中
生物学上感兴趣的有机化合物通过在介质中结合要测定的组成物,以下简称
配体,至少具有10,000分子量的高分子量材料,其具有空间特征的
配体受体,以下简称受体,以及具有自由基功能的
配体类似物,以下简称“
配体类似物”。介质中的
配体类似物和
配体竞争受体位点,
配体类似物结合到受体的数量取决于介质中存在的
配体数量。通过跟踪
配体类似物的电子自旋共振光谱的变化,并将其与在没有任何
配体情况下获得的光谱变化进行比较,可以确定
配体的数量。