A novel amperometric biosensor based on NiO hollow nanospheres for biosensing glucose.
NiO hollow nanospheres were synthesized by controlled precipitation of metal ions with urea using carbon microspheres as templates, which were for the first time adopted to construct a novel amperometric glucose biosensor. Glucose oxidase was immobilized on the surface of hollow nanospheres through chitosan-assisted cross-linking technique. Due to the high specific active sites and high electrocatalytic activity of NiO hollow nanospheres, the constructed glucose biosensors exhibited a high sensitivity of 3.43 microA/mM. The low detection limit was estimated to be 47 microM (S/N=3), and the Michaelis-Menten constant was found to be 7.76 mM, indicating the high affinity of enzyme on NiO hollow nanospheres to glucose. These results show that the NiO hollow nanospheres are a promising material to construct enzyme biosensors.
Li
Chengchao
C
Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China.
Liu
Yanli
Y
Li
Limiao
L
Du
Zhifeng
Z
Xu
Shoujiang
S
Zhang
Ming
M
Yin
Xiaoming
X
Wang
Taihong
T
D001234:Aspergillus niger / Q000201:enzymology; D015374:Biosensing Techniques / Q000379:methods*; D004563:Electrochemistry; D004566:Electrodes; D005947:Glucose / Q000032:analysis* / Q000737:chemistry*; D005949:Glucose Oxidase / Q000378:metabolism; D006801:Humans; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D054118:Nanospheres / Q000737:chemistry* / Q000648:ultrastructure; D009569:Nitric Oxide / Q000737:chemistry*; D015203:Reproducibility of Results; D014961:X-Ray Diffraction
D009569:Nitric Oxide; D005949:Glucose Oxidase; D005947:Glucose