重金属镉人工抗原的制备与鉴定  

Preparation and identification of artificial antigen for heavy metal cadmium

作　　者：刘岑 王金荣[1] 段二珍 王瑜 LIU Cen;WANG Jin-Rong;DUAN Er-Zhen;WANG Yu(College of Biological Engineering,Henan University of Technology,Zhengzhou 450001,China)

机构地区：[1]河南工业大学生物工程学院,郑州450001

出　　处：《食品安全质量检测学报》2022年第21期6915-6922,共8页Journal of Food Safety and Quality

基　　金：国家自然科学基金项目(31702235);河南工业大学创新基金支持计划专项资助项目(2020ZKCJ25)。

摘　　要：目的制备重金属镉人工抗原并对其进行理化性质和免疫原性鉴定。方法以乙二胺四乙酸二钠(ethylenediaminetetraacetic acid disodium salt,EDTA·2Na)或二乙基三胺五乙酸(diethylenetriaminepentaacetic acid,DTPA)为双功能螯合剂,将牛血清白蛋白(bovine albumin,BSA)和Cd^(2+)进行螯合,制备镉人工抗原,通过二喹啉甲酸(bicinchoninic acid,BCA)法、紫外全波长扫描、十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(sodium dodecylsulfate-polyacrylamide gel electrophoresis,SDS-PAGE)、火焰原子吸收法及动物免疫对人工抗原进行分析鉴定。结果紫外全波长扫描和SDS-PAGE初步证明人工抗原合成成功;人工抗原BSA-EDTA-Cd^(2+)和BSA-DTPA-Cd^(2+)的蛋白质质量浓度分别为0.9488、0.5506 mg/mL,Cd^(2+)质量浓度分别为22.8、20.1μg/mL,说明人工抗原合成成功,且BSA-EDTA-Cd2+和BSA-DTPA-Cd2+的偶联比分别为14.2:1和21.6:1;用BSA-EDTA-Cd^(2+)和BSA-DTPA-Cd^(2+)分别免疫小鼠,四免后血清效价均能达到1:25600,且两组血清半数抑制浓度(median inhibition conce ntration,IC_(50))分别达到208.88和83.91 ng,与Ba^(2+)、Fe^(3+)、Zn^(2+)、Pb^(2+)几乎没有交叉反应。结论人工抗原BSA-EDTA-Cd^(2+)、BSA-DTPA-Cd^(2+)合成成功,为制备单克隆抗体和建立重金属镉快速免疫分析技术提供理论基础。Objective To preparethe artificial antigen of heavy metal cadmium(Cd),and identify its physical and chemical properties and immunogenicity.Methods With ethylenediaminetetraacetic acid disodium salt(EDTA·2Na)and diethylenetriaminepentaacetic acid(DTPA)as the bifunctional chelating agents,bovine serum albumin(BSA)and Cd^(2+) were chelated to prepare artificial antigen of cadmium,the artificial antigens were identified by bybicinchoninic acid(BCA)method,ultraviolet full-wavelength scanning,sodium dodecylsulfate-polyacrylamide gel electrophoresis(SDS-PAGE),flame atomic absorption spectrometry and animal immunity.Results Ultraviolet full-wavelength scanning and SDS-PAGE preliminarily proved that the antigen synthesis was successful;the protein massconcentrations of artificial antigens BSA-EDTA-Cd^(2+) and BSA-DTPA-Cd^(2+) were 0.9488 and 0.5506 mg/m L,and the Cd^(2+) mass concentrations were 22.8 and 20.1μg/m L,respectively;and the coupling ratios of BSA-EDTA-Cd^(2+) and BSA-DTPA-Cd^(2+) were 14.2:1 and 21.6:1.Mice were immunized with BSA-EDTA-Cd^(2+) and BSA-DTPA-Cd^(2+),respectively.The serum titers of artificial antigen reached 1:25600 after 4 immunizations,and the median inhibition concentration(IC_(50))of serum in the 2 groups reached 208.88 and 83.91 ng,respectively,and there was almost no cross reaction with Ba^(2+),Fe^(3+),Zn^(2+)and Pb^(2+).Conclusion The artificial antigens BSA-EDTA-Cd^(2+)and BSA-DTPA-Cd^(2+)have been successfully synthesized,which provide a theoretical basis for the preparation of monoclonal antibodies and the establishment of rapid immunoassay for heavy metal cadmium.

关 键 词：镉 人工抗原 理化性质 免疫原性 

分 类 号：TS207.51[轻工技术与工程—食品科学]