Immobilization of horseradish peroxidase on binary self-assembled monolayers with carboxyl- And hydroxyl-terminal groups: Dependence of the amount of immobilized enzymes and their electrocatalytic activity on the monolayer composition

Shin Ichiro Imabayashi, Miki Kashiwa, Masayoshi Watanabe

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The amount of covalently immobilized horseradish peroxidase (HRP), FHRP, and its electrocatalytic current, ired, are measured with changing the monolayer composition for two kinds of mixed self-assembled monolayers (SAMs) of COOH- and OH-termmated alkanethiols with different domain structures. In phase-separated SAMs of mercaptopropionic acid (MPA) and 11-mercaptoundecanol (MUOL), HRP is selectively immobilized on the MPA domains and, therefore, both γHRP and ired values increase in proportion to the surface mole fraction of MPA. In homogeneously mixed SAMs of 11-mercaptoundecanoic acid (MUA) and MUOL, HRP is homogeneously immobilized on the entire surface of the SAM, and γHRP and ired values reach constant values at the mole fraction of MUA, χMUA = 0.4. j.

Original languageEnglish
Pages (from-to)186-188
Number of pages3
JournalElectrochemistry
Volume74
Issue number2
DOIs
Publication statusPublished - 2006 Jan 1

Keywords

  • Binary Self-assembled Monolayer
  • Covalent Immobilization
  • Horseradish Peroxidase
  • Phase Properties

ASJC Scopus subject areas

  • Electrochemistry

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