Nanocrystalline diamond modified gold electrode for glucose biosensing.
Boron-doped diamond has drawn much attention in electrochemical sensors. However there are few reports on non-doped diamond because of its weak conductivity. Here, we reported a glucose biosensor based on electrochemical pretreatment of non-doped nanocrystalline diamond (N-NCD) modified gold electrode for the selective detection of glucose. N-NCD was coated on gold electrode and glucose oxidase (GOx) was immobilized onto the surfaces of N-NCD by forming amide linkages between enzyme amine residues and carboxylic acid groups on N-NCD. The anodic pretreatment of N-NCD modified electrode not only promoted the electron transfer rate in the N-NCD thin film, but also resulted in a dramatic improvement in the reduction of the dissolved oxygen. This performance could be used to detect glucose at negative potential through monitoring the current change of oxygen reduction. The biosensor effectively performs a selective electrochemical analysis of glucose in the presence of common interferents, such as ascorbic acid (AA), acetaminophen (AP) and uric acid (UA). A wide linear calibration range from 10 microM to 15 mM and a low detection limit of 5 microM were achieved for the detection of glucose.
The Key Lab of Analytical Chemistry for Life Science (MOE), Department of Chemistry, Nanjing University, Nanjing 210093, PR China.
Wei
W
Zhao
Jing-Juan
JJ
Xu
Qing-Qing
QQ
Qiu
Hong-Yuan
HY
Chen
D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D003460:Crystallization; D018130:Diamond / Q000737:chemistry*; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004800:Enzymes, Immobilized / Q000737:chemistry; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005947:Glucose / Q000032:analysis* / Q000737:chemistry; D005949:Glucose Oxidase / Q000032:analysis / Q000737:chemistry*; D006046:Gold / Q000737:chemistry; D008839:Microelectrodes; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013499:Surface Properties
D020099:Coated Materials, Biocompatible; D004800:Enzymes, Immobilized; D006046:Gold; D018130:Diamond; D005949:Glucose Oxidase; D005947:Glucose