An amperometric new methylene blue N-mediating sensor for hydrogen peroxide based on regenerated silk fibroin as an immobilization matrix for peroxidase.
A simple and effective procedure was described for the immobilization of peroxidase in regenerated silk fibroin membrane prepared from waste silk. The membranes of regenerated silk fibroin with or without peroxidase, before or after the ethanol treatment, were characterized by ir spectra. An amperometric H202 sensor, based on the immobilized peroxidase in regenerated silk fibroin membrane, in the use of new methylene blue N as an electron transfer mediator, was fabricated. The characteristics of the sensor with respect to linearity, response time, effect of pH and temperature, stability, and reproducibility were investigated. Dependences of Michaelis-Menten constant KMapp on the concentration of the mediator, and the applied potential were also studied and the results were presented. The sensor was highly sensitive to H2O2 with a detection limit of 1.0 x 10(-7)M and with response time of less than 40 s.
Qian
J
J
Department of Chemistry, Fudan University, Shanghai, People's Republic of China.
Liu
Y
Y
Liu
H
H
Yu
T
T
Deng
J
J
D015374:Biosensing Techniques; D004396:Coloring Agents; D004058:Diffusion; D004563:Electrochemistry / Q000295:instrumentation; D004795:Enzyme Stability; D004800:Enzymes, Immobilized; D005349:Fibroins; D006735:Horseradish Peroxidase; D006861:Hydrogen Peroxide / Q000032:analysis*; D008567:Membranes, Artificial; D008751:Methylene Blue; D010084:Oxidation-Reduction; D012038:Regeneration; D013055:Spectrophotometry, Infrared
D004396:Coloring Agents; D004800:Enzymes, Immobilized; D008567:Membranes, Artificial; D005349:Fibroins; D006861:Hydrogen Peroxide; D006735:Horseradish Peroxidase; D008751:Methylene Blue