title: Common causes of glucose oxidase instability in in vivo biosensing: a brief review.
abstract: Clinical management of diabetes must overcome the challenge of in vivo glucose sensors exhibiting lifetimes of only a few days. Limited sensor life originates from compromised enzyme stability of the sensing enzyme. Sensing enzymes degrade in the presence of low molecular weight materials (LMWM) and hydrogen peroxide in vivo. Sensing enzymes could be made to withstand these degradative effects by (1) stabilizing the microenvironment surrounding the sensing enzyme or (2) improving the structural stability of the sensing enzyme genetically. We review the degradative effect of LMWM and hydrogen peroxide on the sensing enzyme glucose oxidase (GOx). In addition, we examine advances in stabilizing GOx against degradation using hybrid silica gels and genetic engineering of GOx. We conclude molecularly engineered GOx combined with silica-based encapsulation provides an avenue for designing long-term in vivo sensor systems.
authors.affiliation: Department of Biomedical Engineering, Research Triangle Materials Research Science and Engineering Center, Duke University, Durham, NC 27708, USA. james.m.harris@duke.edu
authors.forename: James M
authors.initials: JM
authors.lastname: Harris
authors.forename: Catherine
authors.initials: C
authors.lastname: Reyes
authors.forename: Gabriel P
authors.initials: GP
authors.lastname: Lopez
mesh_terms: D015374:Biosensing Techniques; D003432:Cross-Linking Reagents / Q000494:pharmacology; D004339:Drug Compounding; D004355:Drug Stability; D004795:Enzyme Stability; D004800:Enzymes, Immobilized / Q000378:metabolism; D005949:Glucose Oxidase / Q000378:metabolism*; D005976:Glutaral / Q000494:pharmacology; D006801:Humans
chemical_list: D003432:Cross-Linking Reagents; D004800:Enzymes, Immobilized; D005949:Glucose Oxidase; D005976:Glutaral
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