title: Encapsulation of glucose oxidase within poly(ethylene glycol) methyl ether methacrylate microparticles for developing an amperometric glucose biosensor.
abstract: Poly(ethylene glycol) methyl ether methacrylate (PEGMEM) microparticles were synthesized and glucose oxidase (GOx) was immobilized within the microparticles. An amperometric biosensor was fabricated using the microparticles with GOx as biological component. The enzyme immobilization method was optimized by investigating the influence of monomer concentration and cross-linker content used in the preparation of the microparticles in the response of the biosensor. The best analytical results were obtained with the microparticles prepared with 0.21 M PEGMEM and 0.74% cross-linking. Furthermore, we have investigated the influence on the biosensor behaviour of parameters such as working potential, pH, temperature and enzymatic load. In addition, analytical properties such as sensitivity, linear range, response time and detection limit were determined. The biosensor was used to determine glucose in human serum samples and to avoid common interferents present in human serum such as uric and ascorbic acids. A Nafion layer was deposited on the electrode surface with satisfactory results. The useful lifetime of the biosensor was at least 520 days.
authors.affiliation: Sección Departamental de Química Analítica, Facultad de Farmacia, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain.
authors.forename: J P
authors.initials: JP
authors.lastname: Hervás Pérez
authors.forename: E
authors.initials: E
authors.lastname: López-Cabarcos
authors.forename: B
authors.initials: B
authors.lastname: López-Ruiz
mesh_terms: D001205:Ascorbic Acid / Q000097:blood; D015374:Biosensing Techniques / Q000379:methods*; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D005947:Glucose / Q000032:analysis*; D005949:Glucose Oxidase / Q000737:chemistry*; D006046:Gold / Q000737:chemistry; D006801:Humans; D020366:Methylmethacrylate / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013997:Time Factors; D014527:Uric Acid / Q000097:blood
chemical_list: D020099:Coated Materials, Biocompatible; D020366:Methylmethacrylate; D014527:Uric Acid; D011092:Polyethylene Glycols; D006046:Gold; D005949:Glucose Oxidase; D005947:Glucose; D001205:Ascorbic Acid