Stimuli-Responsive Biointerface Based on Polymer Brushes for Glucose Detection

Autor(es)

Crulhas, Bruno P. ^[1] ; Sempionatto, Juliane R. ^[1] ; Cabral, Murilo F. ^[2] ; Minko, Sergiy ^[3] ; Pedrosa, Valber A. ^[1]

Afiliação do(s) autor(es)

^[1] UNESP, Dept Chem & Biochem, Inst Biosci, Botucatu, SP - Brazil

^[2] Univ Sao Paulo, Inst Chem Sao Carlos, Sao Carlos, SP - Brazil

^[3] Clarkson Univ, Chem & Biomol Dept, Potsdam, NY - USA

• Tipo de documento: Artigo Científico
• Fonte: Electroanalysis; v. 26, n. 4, p. 815-822, APR 2014.
• Citações Web of Science: 13

Resumo

The construction and characterization of a biosensor based on polymer brushes is reported. The use of polymer brushes combined with nanoparticles was applied to show its suitability as a biosensor platform - with glucose oxidase as an enzyme probe. The biosensor demonstrated a pH-sensitive on-off property, and it was further used to control or modulate the electrochemical responses. In terms of the kinetic behavior, we were able to show the changing in the kinetic parameters of glucose oxidase operating in on and off state of the polymer brushes. The performance of the bioelectrode was investigated by chronoamperometry, impedance electrochemistry and cyclic voltammetric techniques. At optimized experimental conditions the dynamic concentration range was 2.0 to 16.0mmolL(-1) with a detection limit of 5.6x10-(6) molL(-1). The repeatability of current responses for injections of 5.0mmolL(-1) glucose was evaluated to be 5.3% (n=10). The resulting biosensor seemed to provide the enzymes with a biocompatible nanoenvironment as it sustained the enhanced enzyme activity for an extended time and promoted possible good electron transfer through the polymer brushes to the electrode. (AU)

• Processo FAPESP: 10/07478-5 - Amplificação da respostas biocatalíticas em nanoestruturas de ouro utilizando ressonância plasmônica de superfície localizada
• Beneficiário: Valber de Albuquerque Pedrosa
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores