A dry immunoassay analytical element, for assaying a ligand, comprising in the following order:
(a) a layer containing a labeled ligand;
(b) a spreading layer ;
(c) a receptor layer containing a fixed concentration of an immobilized receptor for the labeled ligand and the receptor is i) covalently bonded to polymeric beads having a diameter in the range of 0.1 to 5 µm and ii) dispersed in a polymeric binder and
(d) a support;
characterized in that the spreading layer contains a water soluble polymer containing vanadium IV (V+4) ions.
一种干式免疫测定分析元件,用于测定
配体,按以下顺序组成:
(a) 含有标记
配体的层;
(b) 铺展层
(c) 受体层,含有固定浓度的标记
配体固定受体,受体 i) 共价键合在聚合珠上,聚合珠直径在 0.1 至 5 微米之间,ii) 分散在聚合粘合剂中;以及
(d) 支持物;
其特征在于,铺展层含有含有
钒 IV(V+4)离子的
水溶性聚合物。