基于银增强金标记物的阳极溶出伏安免疫分析用于补体第三成分的测定

A novel, sensitive anodic stripping volammetric immunoassay was developed based on silver-enhanced immuno-gold label. The immunoreaction was performed in a polystyrene microwell by using the sandwich format. Primary antibodies specific for C-3(complement Ⅲ) were adsorbed passively on the walls of a polystyrene microwell. The C-3 analyte was first captured by the primary antibody and then sandwiched by a secondary colloidal gold-labeled antibody. The addition of the silver enhancement solution results in the precipitation of a large amount of silver on colloidal gold labels due to the catalytic reduction which, after silver metal dissolution in an acidic solution, was determined by anodic stripping voltammetry(ASV) at a glassy-carbon electrode. The influence of some immunoassay conditions upon the anodic stripping peak current was examined and optimized. The anodic stripping peak current depended linearly on the logarithm of C-3 mass concentration over the range of 7.2 ng/mL to 7.33 μg/mL and a detection limit as low as 7ng/mL is achieved. The anodic stripping volammetric immunoassay was applied to the determination of C-3 concentration in human serum with satisfactory results.

基于胶体金标记的阳极溶出伏安免疫分析用于免疫球蛋白G的测定

提出了一种基于胶体金标记的阳极溶出伏安免疫分析方法。免疫反应在聚苯乙烯微孔板中以夹心分析模式进行，通过物理吸附将兔抗人免疫球蛋白G（IgG）抗体固定于微孔板上，与相应抗原IgG发生免疫反应后，再通过夹心模式捕获相应的纳米金标记的羊抗人IgG抗体，然后再与金标羊抗人IgG抗体和金标兔抗羊二抗形成的免疫复合物反应，在微孔板上进一步引入大量的纳米金，将金溶解后，在碳糊电极上用阳极溶出伏安法（ASV）对金离子进行检测，溶出峰电流的大小间接与待分析物IgG的浓度成正比。对免疫分析的一些实验条件进行了优化。阳极溶出峰电流与IgG的对数浓度在1．1～1143ng／mL范围内呈良好的线性关系，检出限为1ng／mL。将该方法应用于人血清中IgG浓度的测定，取得了满意结果。

基于银染色放大和免疫胶体金的金属免疫分析

提出了一种新的、高灵敏的基于银染色放大和免疫胶体金技术的金属免疫分析方法。免疫反应在聚苯乙烯微孔板中以夹心分析模式进行,通过纳米金对银离子的催化还原在金标抗体上沉积大量的金属银,用酸溶解后,在玻碳电极上用阳极溶出伏安法(ASV)对银离子进行检测,溶出峰电流的大小间接与待分析物人免疫球蛋白G(IgG)的浓度成正比。对阳极溶出分析的测定参数如沉积电位、富集时间和免疫分析的一些条件如抗原-抗体反应时间、金标抗体稀释度等进行了优化。阳极溶出峰电流与IgG浓度在1.66μg/L～27.25 mg/L范围内呈良好的线性关系,检测下限为1.1μg/L。