LABELING OF PROTEIN WITH A NEW EUROPIUM CHELATE OF 5-CHLOROSULFOYL-2-THENOYLTRIFLUOROACETONE(CTTA)AND APPLICATION TO IMMUNOASSAY

We describe for the first time the synthesis and the optimal conditions for protein labeling with a new fluorescent probe,5-chlorosulfoyl-2-thenoyltrifluoroacetone(CTTA),whicb forms a highly fluorescent conplex with Eu^(3+) when conjugated to protein.The labeled proteins were characterized by absorbance and fluorescence measurements and the effect of labeling on the biological activity of sone proteins was also studied.It is shown that the new label is suitable for applications in time-resolved fluoroimmunoassay.

铕标记抗癌胚抗原单克隆抗体C_（17）的研究和应用

用合成的Ｎ′－（对－异硫氰基苄基）－二乙三胺－Ｎ￣１，Ｎ￣２，Ｎ￣３，Ｎ￣３－四乙酸铕钠为螫合剂。用ＳｅｐｈａｄｅｘＧ－５０凝胶柱层析分离标记Ｃ＿１７和过量试剂．分部收集的层析物的光密度图和荧光强度图完全一致。蛋白峰处两管标记Ｃ＿１７的比活性分别为５．２和８．９Ｅｕ￣（３＋）离子每Ｃ＿１７分子，而且Ｃ＿１７的标记回收率为６４％。标国家自然科学基金资助记Ｃ＿１７至少在６个月内是稳定的。用铕标记物得到的时间分辨免疫荧光分析的标准曲线具有良好线性和斜率，表明标记物免疫活性良好，而且已用于血清ＣＥＡ分析。

铕螯合剂对甲胎蛋白单克隆抗体标记的研究

目的探究自合成铕螯合剂对甲胎蛋白单克隆抗体的标记方法。方法经EDC和NHS活化的铕螯合剂偶联甲胎蛋白单克隆抗体,通过透析收集标记抗体,检测荧光强度和免疫活性,计算回收率和标记率。结果标记抗体荧光强度高,免疫活性无明显变化,回收率为94%,标记率为15。结论自合成的铕螯合剂可用于甲胎蛋白单克隆抗体的标记,标记效果理想,可进一步建立均相时间分辨荧光免疫分析方法。