孔雀石绿单克隆抗体制备和酶联免疫检测方法的建立

针对孔雀石绿三苯环特征结构,设计合成1种高质量半抗原。通过偶联载体蛋白、动物免疫和细胞融合,制备出一株高质量的单克隆抗体MG-DA4-C7,亚类为IgG1,轻链为κ型。通过对包被原浓度、抗体浓度、二抗浓度的优化,建立了孔雀石绿间接竞争酶联免疫分析方法。方法半抑制浓度( IC50)为0.96μg/L,线性检测范围(IC20~C80)为0.1~8.1μg/L,LOD(IC10)为0.05μg/L,回归方程y=-0.3274lgx+0.4698(R2=0.9891)。本方法特异性高,与代谢物隐孔雀石绿交叉反应小于0.1％,与结晶紫、灿烂绿交叉反应率分别为18.1％和26.5％；实际样品添加回收率为87.3％~107.3％。本方法测定结果经HPLC-MS/MS方法确证,二者相关系数达0.999。本方法可用于鱼类等水产品中孔雀石绿残留的实际检测。

Synthesis of Novel Hapten and Development of Monoclonal Antibody-based Enzyme-Linked Immunosorbent Assay for Malachite Green in Fish Samples

To produce specific antibodies against malachite green ( MG) , one special hapten was synthesized and characterized, and conjugated to carrier protein as immunogen. The immunogen showed excellent reactogenicity and immunogenicity. One specific monoclonal antibody (mAb, named MG-DA4-C7) with high sensitivity and specificity for MG in indirect competitive enzyme-linked immunoassay ( icELISA ) was screened. The isotype was IgG1 and the light chain was κ type. After optimization of ELISA conditions, the proposed icELISA showed a 50% inhibition value ( IC50 ) of 0. 96 μg/L, a linear range ( IC20-IC80 ) of 0. 1-8. 1 μg/L and a limit of detection ( LOD, IC10 ) of 0. 05 μg/L for determination of MG. The assay showed cross-reactivity of 18. 1%, 26. 5% with crystal violet and brilliant green, respectively, and negligible cross-reactivity with other metabolites of MG (<0 . 1%) . The average recoveries of MG from spiked fish samples were from 87. 3% to 107. 3%. Good correlation (R2=0. 999) was obtained between the results of icELISA and those of liquid chromatography-tandem mass spectrometry analysis. The proposed icELISA is suitable for the determination of MG in fish samples in a simple and sensitive manner.