Electrochemical biosensing of galactose based on carbon materials: graphene versus multi-walled carbon nanotubes

Dalkıran, Berna; Erden, Pınar Esra; Kılıç, Esma

Electrochemical biosensing of galactose based on carbon materials: graphene versus multi-walled carbon nanotubes

2016

Dalkıran, Berna | Erden, Pınar Esra | Kılıç, Esma

In this study, two enzyme electrodes based on graphene (GR), Co₃O₄ nanoparticles and chitosan (CS) or multi-walled carbon nanotubes (MWCNTs), Co₃O₄ nanoparticles, and CS, were fabricated as novel biosensing platforms for galactose determination, and their performances were compared. Galactose oxidase (GaOx) was immobilized onto the electrode surfaces by crosslinking with glutaraldehyde. Optimum working conditions of the biosensors were investigated and the analytical performance of the biosensors was compared with respect to detection limit, linearity, repeatability, and stability. The MWCNTs-based galactose biosensor provided about 1.6-fold higher sensitivity than its graphene counterpart. Moreover, the linear working range and detection limit of the MWCNTs-based galactose biosensor was superior to the graphene-modified biosensor. The successful application of the purposed biosensors for galactose biosensing in human serum samples was also investigated.

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