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.
- Binary Self-assembled Monolayer
- Covalent Immobilization
- Horseradish Peroxidase
- Phase Properties
ASJC Scopus subject areas