title: Immobilization of glucose oxidase onto gold nanoparticles with enhanced thermostability.
abstract: Immobilized proteins and enzymes were widely investigated in medical field as well as in food and environmental fields. In this paper, glucose oxidase (GOD) monolayer was covalently immobilized on the surface of gold nanoparticles (AuNPs) to fabricate bioconjugate complex. The citrate-stabilized AuNPs were first functionalized by a carboxyl-terminated alkanethiol and the terminal carboxyl groups were subsequently bonded with side-chain amino groups of protein surface through EDC/NHS coupling reaction. The enzyme activity assays of the obtained bioconjugates display an enhanced thermostability and similar pH-dependence behavior in contrast with that of free enzyme. Such GOD/AuNPs bioconjugates can be considered as a catalytic nanodevice to construct nanoreactor based on glucose oxidation reaction for biotechnological purpose.
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), International Joint Lab, CAS Key Lab of Colloid and Interface Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, PR China.
authors.forename: Dongxiang
authors.initials: D
authors.lastname: Li
authors.forename: Qiang
authors.initials: Q
authors.lastname: He
authors.forename: Yue
authors.initials: Y
authors.lastname: Cui
authors.forename: Li
authors.initials: L
authors.lastname: Duan
authors.forename: Junbai
authors.initials: J
authors.lastname: Li
mesh_terms: D004800:Enzymes, Immobilized / Q000378:metabolism*; D005949:Glucose Oxidase / Q000378:metabolism*; D006046:Gold; D006863:Hydrogen-Ion Concentration; D053768:Metal Nanoparticles; D046529:Microscopy, Electron, Transmission; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D004800:Enzymes, Immobilized; D006046:Gold; D005949:Glucose Oxidase