Indicator-free electrochemical biosensor for microRNA detection based on carbon nanofibers modified screen printed electrodes
Küçük Resim Yok
Tarih
2015
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier B.V.
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Carbon nanofibers (CNFs) are fiber-structured nano-sized carbon materials, which have excellent mechanical, thermal and electrical properties. CNFs possess a wide range of application especially in biorecognition area. In this study, we developed an indicator-free voltammetric biosensor for detection of miRNA-34a target RNA by using carbon nanofiber enriched disposable screen printed electrodes (CNF-SPEs). The sensitive and selective recognition of miRNAs has been an attractive topic due to they have been defined as small RNAs and play major roles in regulating the translation and degradation of messenger RNAs. The characterization of CNF-SPEs in contrast to unmodified ones was firstly performed by scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS) techniques. The amino linked DNA probe, that was the complementary sequence of miRNA-34a, was immobilized onto the surface of CNF-SPEs. After measuring the guanine oxidation signal measured by differential pulse voltammetry (DPV), the detection of sequence-selective hybridization was then investigated between probe and miRNA-34a RNA target, or other miRNA sequences; miRNA-15a, or miRNA-660, which were chosen as noncomplementary sequences (NC). The detection limit was corresponded to 10.98 µg/mL (54 pmol in 35 µL sample) in the linear concentration range of target miRNA-34a from 25 to 100 µg/mL by using CNF-SPEs. The features of this present study was comprehensively discussed by means of the unique characteristics of single-use CNF-SPEs and importance of miRNA monitoring. © 2015 Elsevier B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
Carbon nanofibers, differential pulse voltammetry, electrochemical impedance spectroscopy, miRNA, screen printed electrode
Kaynak
Journal of Electroanalytical Chemistry
WoS Q Değeri
Scopus Q Değeri
Q1
Cilt
755
