Selective and ultrasensitive electrochemical immunosensing of NSE cancer biomarker in human serum using epoxy-substituted poly(pyrrole) polymer modified disposable ITO electrode
Yükleniyor...
Dosyalar
Tarih
2020
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier B.V.
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
An ultrasensitive, specific and label-free immunosensor was developed to determine the lowest alteration of neuron specific enolase antigen (NSE), the standard biomarker of lung cancer patients. This immunosensor was the first biosensor which was fabricated by utilizing epoxy-substituted-polypyrrole P(Pyr-Epx) polymer as an immobilization platform. The fabrication steps of the immunosensor were followed by using electrochemical studies (electrochemical impedance spectroscopy and cyclic voltammetry) and these techniques were applied to characterize the binding interactions. Scanning electron microscopy and atomic force microscopy analyses were performed to investigate the changes formed on the indium tin oxide electrode surface morphology and electrode surface structure. The optimization of the experimental parameters and the analytical performance of the proposed immunosensor were widely evaluated. Under optimum experimental conditions, the change in impedimetric signal was determined to follow the specific biointeraction between anti-NSE antibody and NSE antigen. The sensing ability of the proposed immunosensor for NSE detection showed a wide linear detection range of 0.02–7.5 pg/mL, with a low detection limit of 6.1 fg/mL. This impedimetric immunosensor also demonstrated highly repeatable and reproducible responses, and reliable results in the analysis of human serum samples with recoveries between 98.29 % and 102.81 %. In addition, the designed immunosensor could be used for detection of lung cancer biomarkers after simple dilution of serum samples with phosphate buffer. © 2019 Elsevier B.V.
Açıklama
Anahtar Kelimeler
Epoxy-substituted-polypyrrole P(Pyr-Epx) polymer, Impedimetric immunosensor, Neuron specific enolase, Antigens, Atomic force microscopy, Binding energy, Biological organs, Biomarkers, Cyclic voltammetry, Diseases, Electrochemical impedance spectroscopy, Immunosensors, Indium metallography, Morphology, Polymers, Polypyrroles, Scanning electron microscopy, Structural optimization, Surface morphology, Tin metallography, Tin oxides, Electrochemical immunosensing, Electrochemical studies, Experimental parameters, Impedimetric immunosensors, Indium tin oxide electrodes, Linear detection ranges, Neuron specific enolase, Substituted polypyrrole, Electrochemical electrodes
Kaynak
Sensors and Actuators, B: Chemical
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
306
