title: A novel hydrogen peroxide sensor based on the direct electron transfer of horseradish peroxidase immobilized on silica-hydroxyapatite hybrid film.
abstract: The direct electron transfer of immobilized horseradish peroxidase (HRP) on silica-hydroxyapatite (HAp) hybrid film-modified glassy carbon electrode (GCE) and its application as H(2)O(2) biosensors were investigated. On silica/HRP-HAp/GCE, HRP displayed a fast electron transfer process accompanied with one proton participate in. This sensor exhibited an excellent electrocatalytic response to the reduction of H(2)O(2) without the aid of an electron mediator. The proposed biosensor showed good reproducibility and high sensitivity to H(2)O(2) with the detection limit of 0.35 microM. In the range of 1.0-100 microM, the catalytic reduction current of H(2)O(2) was proportional to H(2)O(2) concentration. The apparent Michaelis-Menten constant (k(m)(app)) of the biosensor was calculated to be 21.8 microM, exhibiting a high enzymatic activity and affinity for H(2)O(2).
authors: College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China.
authors: Bin
authors: B
authors: Wang
authors: Jing-Jing
authors: JJ
authors: Zhang
authors: Zhuang-Ying
authors: ZY
authors: Pan
authors: Xu-Quan
authors: XQ
authors: Tao
authors: Huai-Sheng
authors: HS
authors: Wang
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D017886:Durapatite / Q000737:chemistry*; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004579:Electron Transport; D004800:Enzymes, Immobilized / Q000737:chemistry; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006735:Horseradish Peroxidase / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000032:analysis* / Q000737:chemistry; D008567:Membranes, Artificial; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012822:Silicon Dioxide / Q000737:chemistry*
chemical_list: D004800:Enzymes, Immobilized; D008567:Membranes, Artificial; D012822:Silicon Dioxide; D017886:Durapatite; D006861:Hydrogen Peroxide; D006735:Horseradish Peroxidase