Direct electron transfer with enzymes on nanofiliform titanium oxide films with electron-transport ability

So Yoon Lee, Ryosuke Matsuno, Kazuhiko Ishihara, Madoka Takai

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Direct electron transfer (DET) from biomolecules to electrode is a process without electron-mediators, thus superior selectivity and sensitivity is expected in order to monitor electron transfer between electrode and biomolecules without any mediator interference. However, DET is difficult because a redox center which is an electron active center of proteins such as enzymes is buried deep. So, a unique electrode nanostructure to reach the redox center is a critical factor. Here we have systematically investigated terms for DET using various nanofiliformed electrode morphologies and enzyme concentrations. It is pointed out that the reaction site is below 100nm, the ration amounts of adsorbed enzyme per surface area are below 1.0 are contributed to the DET. As a great application, we have developed a biosensor monitoring the hydrogen peroxide (H2O2) detecting capability from peroxidase directly. For the fabricated HRP/nTOF/Ti-electrodes observed the catalytic current value was linear according to the increase in the concentration of H2O2 up to 100μM, which indicates a good potential for an H2O2 biosensor.

Original languageEnglish
Pages (from-to)289-293
Number of pages5
JournalBiosensors and Bioelectronics
Issue number1
Publication statusPublished - 2013 Mar 15
Externally publishedYes


  • Biosensor
  • Direct electron transfer
  • Nanofiliform
  • Titanium oxide film

ASJC Scopus subject areas

  • Biotechnology
  • Biophysics
  • Biomedical Engineering
  • Electrochemistry


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