Direct electrochemistry and electrocatalysis of horseradish peroxidase based on clay-chitosan-gold nanoparticle nanocomposite.
Gold nanoparticles stabilized by chitosan (AuCS) were hybridized with exfoliated clay nanoplates through electrostatic interaction. The resulting clay-chitosan-gold nanoparticle nanocomposite (Clay/AuCS) was used to modify glassy carbon electrode (GCE). HRP, a model peroxidase, was entrapped between the Clay/AuCS film and another clay layer. UV-vis spectrum suggested HRP retained its native conformation in the modified film. Basal plane spacing of clay obtained by X-ray diffraction (XRD) indicated that there was an intercalation-exfoliation-restacking process among HRP, AuCS and clay during the modified film drying. The immobilized HRP showed a pair of quasi-reversible redox peaks at -0.195 V (vs. saturated Ag/AgCl electrode) in 0.1M PBS (pH 7.0), and the biosensor displayed a fast amperometric response to H(2)O(2) with a wide linear range of 39 microM to 3.1 mM. The detection limit was 9.0 microM based on the signal to noise ratio of 3. The kinetic parameters such as alpha (charge transfer coefficient), k(s) (electron transfer rate constant) and K(m) (Michaelis-Menten constant) were evaluated to be 0.53, 2.95+/-0.20s(-1) and 23.15 mM, respectively.
School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, PR China.
Xiaojuan
X
Zhao
Zhibin
Z
Mai
Xinhuang
X
Kang
Xiaoyong
X
Zou
D000538:Aluminum Silicates / Q000737:chemistry*; D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D002384:Catalysis; D048271:Chitosan / Q000737:chemistry*; D000077215:Clay; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004800:Enzymes, Immobilized / Q000737:chemistry; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006046:Gold / Q000737:chemistry*; D006735:Horseradish Peroxidase / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000032:analysis*; D053758:Nanoparticles / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
D000538:Aluminum Silicates; D004800:Enzymes, Immobilized; D006046:Gold; D048271:Chitosan; D006861:Hydrogen Peroxide; D006735:Horseradish Peroxidase; D000077215:Clay