title: Direct electrochemistry of horseradish peroxidase on TiO(2) nanotube arrays via seeded-growth synthesis.
abstract: Horseradish peroxidase (HRP) was successfully immobilized on vertically oriented TiO(2) nanotube arrays (NTAs), which was prepared by a seeded-growth mechanism. The nanotubular structure of TiO(2) was characterized by scanning electron microscope (SEM). After encapsulated HRP on TiO(2) nanotube arrays, the direct electron transfer of HRP was observed. Owing to the redox reaction of electroactive center of HRP, the HRP/TiO(2) NTAs modified electrode exhibited a pair of quasi-reversible peaks with the peak-to-peak separation of 70 mV and the formal potential of -0.122 V (vs. SCE) in 0.2mol L(-1) phosphate buffer solution (PBS, pH 7.0). The number of transference electron was 0.84 and the direct electron transfer (ET) constant (k(s)) was 3.82 s(-1). The HRP/TiO(2) NTAs modified electrode displayed an excellent electrocatalytic performance for H(2)O(2) and the formal Michaelis-Menten constant (K(m)(app)) was 1.9 mmol L(-1). The response currents had a good linear relation with the concentration of H(2)O(2) from 5.0 x 10(-7) mol L(-1) to 1.0 x 10(-5) mol L(-1) and 5.0 x 10(-5) mol L(-1) to 1.0 x10(-3) mol L(-1), respectively.
authors.affiliation: Department of Chemistry, East China Normal University, Shanghai 200062, China.
authors.forename: Fanghua
authors.initials: F
authors.lastname: Wu
authors.forename: Jingjing
authors.initials: J
authors.lastname: Xu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Tian
authors.forename: Zhichao
authors.initials: Z
authors.lastname: Hu
authors.forename: Liwei
authors.initials: L
authors.lastname: Wang
authors.forename: Yuezhong
authors.initials: Y
authors.lastname: Xian
authors.forename: Litong
authors.initials: L
authors.lastname: Jin
mesh_terms: D015374:Biosensing Techniques; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D003460:Crystallization / Q000379:methods; D004563:Electrochemistry / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006735:Horseradish Peroxidase / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000032:analysis*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014025:Titanium / Q000737:chemistry*
chemical_list: D020099:Coated Materials, Biocompatible; C009495:titanium dioxide; D006861:Hydrogen Peroxide; D014025:Titanium; D006735:Horseradish Peroxidase