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• W2023315032 endingPage "8074" @default.
• W2023315032 startingPage "8068" @default.
• W2023315032 abstract "Titanate nanotubes (TNT) were proven to be efficient support matrixes for the immobilization of myoglobin (Mb). A comparative study was performed using the corresponding analogue, nanocrystalline anatase TiO2 (TNP). UV−visible absorption and FT-IR spectra show that Mb was not obviously denatured in TNT film in contrast to the significant denaturation of Mb in TNP film. Cyclic voltammetry and square wave voltammetry measurements were carried out using the Mb−TNT or Mb−TNP cast film-covered basal plane pyrolytic graphite electrode. The Mb−TNT film gave a well-defined, nearly reversible redox couple with the apparent formal peak potential (Ep) of −0.239 V (vs Ag/AgCl) in pH 5.5 buffer, whereas a relatively smaller, quais-reversible redox pair with Ep of −0.263 V was observed for the Mb−TNP film. The amounts of electroactive Mb in TNT film and TNP film were 15 and 10%, respectively. Moreover, the Mb−TNT film exerted facile direct electron transfer with the apparent heterogeneous electron-transfer rate constant (kET) of 86 ± 7 s-1, almost 4 times the 22 ± 5 s-1 value for the Mb−TNP membrane and higher than other Mb-entrapped films reported. Additionally, the Mb−TNT film demonstrates good electrocatalytic reduction of hydrogen peroxide with a detection limit of 0.6 μM, much lower than the 3.0 μM value for the Mb−TNP electrode and other Mb-related film-modified electrodes reported so far. The Mb−TNT film exhibits higher peroxidase-like activity with the apparent Michaelis-Menton constant (KM) of 140 μM, significantly lower than the 1300 μM value for the Mb−TNP film. The functional hydroxyl group and the surface charge as well as tubular morphology of TNT are important factors to stabilize the bound protein." @default.
• W2023315032 created "2016-06-24" @default.
• W2023315032 creator A5017538950 @default.
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• W2023315032 date "2005-11-09" @default.
• W2023315032 modified "2023-09-23" @default.
• W2023315032 title "Direct Electrochemistry of Myoglobin in Titanate Nanotubes Film" @default.
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• W2023315032 doi "https://doi.org/10.1021/ac051640t" @default.
• W2023315032 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16351157" @default.
• W2023315032 hasPublicationYear "2005" @default.
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