title: Amperometric glucose biosensor based on glucose oxidase-lectin biospecific interaction.
abstract: An amperometric glucose biosensor based on high electrocatalytic activity of gold/platinum hybrid functionalized zinc oxide nanorods (Pt-Au@ZnONRs) and glucose oxidase (GOx)-lectin biospecific interaction was proposed. The Pt-Au@ZnONRs, which were prepared through a multiple-step chemosynthesis, were modified onto the surface of glassy carbon electrode (GCE) by a simple casting method due to the excellent film forming ability of the Pt-Au@ZnONRs suspension. Subsequently, a layer of porous gold nanocrystals (pAu) film was assembled onto the Pt-Au@ZnONRs film by immersing the electrode in HAuCl(4) solution to perform the electrochemical deposition at a constant potential of -0.2V. Following that, Concanavalin A (ConA) was immobilized onto the surface of pAu film through physical adsorption and covalent binding interactions between gold nanomaterials and the amino groups or thiol groups of ConA protein. Finally, the GOx was easily immobilized on the ConA/pAu/Pt-Au@ZnONRs/GCE by the biospecific interaction between GOx and ConA. The Pt-Au@ZnONRs composites were characterized using transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Cyclic voltammetry (CV) was used to characterize the assembly process of the modified electrode. Proposed biosensor showed a high electrocatalytic activity to the glucose with a wide linear range covering from 1.8 μM to 5.15 mM, a low detection limit of 0.6 μM and a low apparent Michaelis-Menten constant (K(M)(app)) of 0.41 mM. Furthermore, the biosensor exhibited good reproducibility and long-term stability, as well as high selectivity. The integration of Pt-Au@ZnONRs and GOx-lectin biospecific interaction would offer potential promise for the fabrication of biosensors and biocatalysts.
authors: Education Ministry Key Laboratory on Luminescence and Real-Time Analysis, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China.
authors: Juanjuan
authors: J
authors: Zhang
authors: Chengyan
authors: C
authors: Wang
authors: Shihong
authors: S
authors: Chen
authors: Dehua
authors: D
authors: Yuan
authors: Xia
authors: X
authors: Zhong
mesh_terms: D000327:Adsorption; D015374:Biosensing Techniques; D002244:Carbon; D002384:Catalysis; D003208:Concanavalin A / Q000378:metabolism*; D055664:Electrochemical Techniques / Q000295:instrumentation*; D004566:Electrodes; D004800:Enzymes, Immobilized / Q000378:metabolism*; D004867:Equipment Design; D005947:Glucose / Q000032:analysis*; D005949:Glucose Oxidase / Q000378:metabolism*; D006046:Gold; D008854:Microscopy, Electron; D043942:Nanotubes; D056951:Photoelectron Spectroscopy; D010984:Platinum; D015203:Reproducibility of Results; D015034:Zinc Oxide
chemical_list: D004800:Enzymes, Immobilized; D003208:Concanavalin A; D010984:Platinum; D002244:Carbon; D006046:Gold; D005949:Glucose Oxidase; D005947:Glucose; D015034:Zinc Oxide