There are described stable fluorescent labels comprising a complex of Eu.sup.+3 and a chelating agent comprising a nucleus which is a triplet sensitizer having a triplet energy greater than that of Eu.sup.+3 and at least two heteroatom-containing groups which form coordinate complexes with Eu.sup.+3 and a third heteroatom-containing group or heteroatom in or appended to the triplet sensitizer. Labeled physiologically active materials useful in specific binding assays such as labeled antigens, haptens, antibodies, hormones and the like comprising the stable fluorescent labels having physiologically active materials adsorbed or bonded thereto are also described.
本文描述了稳定的荧光标记物,其中包括Eu.sup.+3和
螯合剂的复合物,该
螯合剂包括一个三重态敏化剂核,其三重态能量大于Eu.sup.+3,并且至少有两个含杂原子的基团与Eu.sup.+3形成配位络合物,以及第三个杂原子含量的基团或附加到三重态敏化剂中的杂原子。还描述了用于特定结合分析的标记生理活性材料,例如标记的抗原、半抗原、
抗体、激素等,其中包括吸附或与稳定荧光标记物结合的生理活性材料。