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 a...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.展开更多
提出了一种基于纳米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 A(IgA)抗体固定于微孔板上,与相应抗原 IgA 发生免疫反应后,再通过夹心模式捕获相应的纳米金标...提出了一种基于纳米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 A(IgA)抗体固定于微孔板上,与相应抗原 IgA 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 IgA 抗体,然后再与金标羊抗人 IgA 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 IgA 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 IgA 的浓度在0.018 mg/L～181 mg/L 范围内呈良好的线性关系,检测下限为10μg/L。将该分析方法应用于人血清中 IgA 浓度的测定,取得了满意结果。展开更多
文摘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.
文摘提出了一种基于纳米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 A(IgA)抗体固定于微孔板上,与相应抗原 IgA 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 IgA 抗体,然后再与金标羊抗人 IgA 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 IgA 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 IgA 的浓度在0.018 mg/L～181 mg/L 范围内呈良好的线性关系,检测下限为10μg/L。将该分析方法应用于人血清中 IgA 浓度的测定,取得了满意结果。
