Use of fluorescent europium chelates as labels for detection of microcystin-LR in Taihu Lake, China

A method using the time-resolved fluorescence technology to establish a highly sensitive microcystin-LR (MC-LR) indirect competitive immunoassay was proposed in this work. This method was used to monitor the MC-LR level in source water and treated drinking water from Taihu Lake. Algae in the water samples were removed by centrifugation, and the MC-LR level was quantified using this method. Testing results showed that the sensitivity of this method was 0.01 μg/L, and the dynamic measuring range was from 0.05 to 2 μg/L. The average recovery was 115%, and the variation (CV) within and between different batches were 7.3% and 9.7%, respectively. Testing results also indicated that this time-resolved fluoroimmunoassay was sensitive and accurate in measuring MC-LR level, especially for quantitative analysis MC-LR level in bulk water.     

三聚氰胺单克隆抗体的制备及其免疫学特性鉴定

采用牛血清白蛋白偶联的三聚氰胺( melamine- BSA)完全抗原免疫BALB/C小鼠,应用杂交瘤技术制备抗三聚氰胺的特异性单克隆抗体.所得单克隆抗体效价可达5.0×105,且抗体的亚类类型为IgG1,抗体的亲和常数为3.21×109 L/mol.与三聚氰酸、三聚氰酸二酰胺、三聚氰酸一酰胺的交叉反应率分别为30％、93％和46％.说明该单抗可用于三聚氰胺类物质的检测,为研制高质量的三聚氰胺ELISA试剂盒和胶体金试纸条奠定了基础.