A suspension of diagnostic particles comprising antibody molecules attached to a carboxylate derivatized polymer core is provided for agglutination tests. The antibody is linked to the core through an avidin-biotin bridge. Avidin is joined by an amide bond to carboxyl groups on the core, and biotin is linked by an amide bond to amino groups on the antibody molecule. The core-bound antibody is exposed to a mixture of free biotin and biotinylated antibody to attach a controlled amount of antibody that is consistent with suspension stability prior to its use in a test and rapid crosslinking of suspended particles in the presence of antigen.
提供了一种用于凝集试验的诊断颗粒悬浮液,该悬浮液由附着在
羧酸衍
生物聚合物芯上的
抗体分子组成。
抗体通过阿维丁-
生物素桥与芯相连。 阿维丁通过酰胺键与芯上的羧基相连,
生物素通过酰胺键与
抗体分子上的
氨基相连。 与芯结合的
抗体暴露于游离
生物素和
生物素化
抗体的混合物中,以附着可控量的
抗体,该量符合悬浮液在试验中使用前的稳定性以及悬浮颗粒在抗原存在下的快速交联。