Detection of real sample DNA at a cadmium sulfide--chitosan/gelatin modified electrode.
Cadmium sulfide (CdS) was combined with chitosan (Chi) and gelatin (Gel) to prepare a CdS-Chi/Gel modified electrode. Chi exhibits a large positive charge density and was to provide a uniform of CdS surface. Gel exhibits high mechanical strength and low toxicity toward mammalian cells, and is non-antigenic biopolymer. CdS-Chi exhibits a lower contact angle than that of bare CdS, indicating that the hydrophilicity of the sample surface had increased. Electrochemical impedance spectroscopy (EIS) was used to determine diffusion coefficients and to characterize the electron transfer kinetics during the redox reactions. The surface morphologies of CdS-Chi and Gel were characterized using scanning electron microscopy (SEM) and atomic force microscopy (AFM). Differential pulse voltammetry (DPV) was used to detect the analytes. DPV not only increased the linear range of the electrocatalytic current, but also lowered the overpotential for oxidation interference in the measurements. The CdS electrode exhibited a enhanced electrocatalytic activity toward the analytes evaluated in this study. The presence of Gel enhanced the loading and stability of the electrode. The fabricated electrode was successfully used for the simultaneous electrochemical oxidation of guanine (G) and adenine (A).
Electroanalysis and Bioelectrochemistry Lab, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan, ROC.
Ying
Y
Li
Electroanalysis and Bioelectrochemistry Lab, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan, ROC.
Wan-Chun
WC
Chen
Electroanalysis and Bioelectrochemistry Lab, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan, ROC. Electronic address: smchen78@ms15.hinet.net.
Shen-Ming
SM
Chen
Chemistry Division, Center for General Education, Chang Gung University, Tao-Yuan, Taiwan. Electronic address: blou@mail.cgu.edu.tw.
Bih-Show
BS
Lou
Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
M Ajmal
MA
Ali
Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
Fahad M A
FM
Al-Hemaid
D019187:Cadmium Compounds / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D004247:DNA / Q000737:chemistry*; D004566:Electrodes; D005780:Gelatin / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D013440:Sulfides / Q000737:chemistry*
D019187:Cadmium Compounds; D013440:Sulfides; C034939:cadmium sulfide; D005780:Gelatin; D004247:DNA; D048271:Chitosan
Adenine (A); Cadmium sulfide (CdS); Chitosan (Chi); Gelatin (Gel); Guanine (G); Modified electrodes