Magneto-controlled bioelectronics for the antigen-antibody interaction based on magnetic-core/gold-shell nanoparticles functionalized biomimetic interface.
A new protein assay system for the antigen-antibody interaction was developed by immobilization of carcinoembryonic antibody (anti-CEA) onto magnetic-core/gold-shell nanoparticles-functionalized biomimetic interface on multiporous polythionine modified magnetic carbon paste electrodes (MCPE). Differential pulse voltammetric (DPV) technique was employed to investigate the antigen-antibody interaction in pH 6.8 acetate acid buffer solution after incubation with various CEA samples for 50 min at room temperature. The peak currents decreased with increased CEA concentration, and were proportional to the CEA concentration in the range of 1.5-60 ng/ml with a detection limit of 0.3 ng/ml at a signal-to-noise ratio of 3. Moreover, the selectivity, reproducibility and stability of the proposed immunoassay system were acceptable. Compared with the conventional immunoassays, the developed immunoassay system was simple and rapid without multiple labeling and separation steps. Importantly, the proposed methodology would be valuable for diagnosis and monitoring of carcinoma and its metastasis.
College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, People's Republic of China. tdping@swu.edu.cn
Dianping
D
Tang
Ruo
R
Yuan
Yaqin
Y
Chai
D000936:Antigen-Antibody Complex / Q000032:analysis*; D000937:Antigen-Antibody Reactions; D032701:Biomimetics / Q000295:instrumentation*; D015374:Biosensing Techniques / Q000295:instrumentation*; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods; D004581:Electronics / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006046:Gold / Q000737:chemistry; D018189:Immunomagnetic Separation / Q000295:instrumentation* / Q000379:methods; D008280:Magnetics / Q000295:instrumentation*; D049329:Nanostructures / Q000737:chemistry / Q000648:ultrastructure; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods; D013499:Surface Properties
D000936:Antigen-Antibody Complex; D006046:Gold