title: A novel microfluidic immunoassay system based on electrochemical immunosensors: an application for the detection of NT-proBNP in whole blood.
abstract: Electrochemical immunosensors have attracted great interest in the search for a selective, simple and reliable system for molecular recognition. Presently, electrochemical immunosensors have been widely studied for biomedical molecular's detection, but the regeneration of these immunosensors has restricted their wide application. To prepare a regeneration-free immunosensor, which may be more suitable for clinical determination, a repeatable immunoassay system was developed based on an electrochemical immunosensor with magnetic nanoparticles, biotin-avidin system (BAS) and Fab antibodies for the heart failure markers aminoterminal pro-brain natriuretic peptides (NT-proBNP). At the same time, a microfluidic system was combined into the proposed system, which enabled continuous determination. Using NT-proBNP as a model system, the proposed immunosensor exhibited rapid and sensitive amperometric response to NT-proBNP with good selectivity, stability, and a wide linear range (0.005-1.67 ng/mL and 1.67-4 ng/mL with a detection limit of 0.003 ng/mL under optimal conditions). Importantly, the proposed immunosensor was also suitable for the detection of other proteins and provided new opportunities for disease diagnosis.
authors.affiliation: Department of Clinical Biochemistry, Third Military Medical University, 30 Gaotanyan Street, Shapingba District, Chongqing 400038, PR China.
authors.forename: Wenbin
authors.initials: W
authors.lastname: Liang
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Bo
authors.initials: B
authors.lastname: Zhang
authors.forename: Zhujun
authors.initials: Z
authors.lastname: Zhang
authors.forename: An
authors.initials: A
authors.lastname: Chen
authors.forename: Daliang
authors.initials: D
authors.lastname: Qi
authors.forename: Weijing
authors.initials: W
authors.lastname: Yi
authors.forename: Chuanmin
authors.initials: C
authors.lastname: Hu
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D001774:Blood Chemical Analysis / Q000295:instrumentation*; D003217:Conductometry / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006333:Heart Failure / Q000097:blood* / Q000175:diagnosis; D006801:Humans; D007118:Immunoassay / Q000295:instrumentation*; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation*; D020097:Natriuretic Peptide, Brain / Q000097:blood*; D010446:Peptide Fragments / Q000097:blood*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D010446:Peptide Fragments; C109794:pro-brain natriuretic peptide (1-76); D020097:Natriuretic Peptide, Brain