Journal
TALANTA
Volume 128, Issue -, Pages 9-14Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2014.03.071
Keywords
Electrogenerated chemiluminescence; Glutaraldehyde; Glucose oxidase; Nanospheres; Glucose
Categories
Funding
- National Natural Science Foundation of China [21275119, 21075100]
- Ministry of Education of the People's Republic of China [708073]
- Nature Science Foundation of Chongqing City [CSTC-2011BA7003, CSTC-2009BA1003]
- Specialized Research Fund for the Doctoral Program of Higher Education [20100182110015]
- Doctor Foundation of Southwest University [swu113029]
- Fundamental Research Funds for the Central Universities [XDJK2013C115, XDJK2013A008]
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Well-distributed hollow gold nanospheres (Au-shell@GOD) (20 + 5 nm) were synthesized using the glucose oxidase (GOD) cross-linked with glutaraldehyde as a template. A glucose biosensor was prepared based on Au-shell@GOD nanospheres for catalyzing luminol electrogenerated chemiluminescence (ECL). Firstly, chitosan was modified in a glassy carbon electrode which offered an interface of abundant amino-groups to assemble Au-shell@GOD nanospheres. Then, glucose oxidase was adsorbed on the surface of Au-shell@GOD nanospheres via binding interactions between Au-shell and amino groups of GOD to construct a glucose biosensor. The Au-shell@GOD nanospheres were investigated with TEM and UV-vis. The ECL behaviors of the biosensor were also investigated. Results showed that, the obtained Au-shell@GOD nanospheres exhibited excellent catalytic effect towards the ECL of luminol-H2O2 system. The response of the prepared biosensor to glucose was linear with the glucose concentration in the range of 1.0 mu M to 43 mM (R=0.9923) with a detection limit of 0.31 mu M (signal to noise = 3). This ECL biosensor exhibited short response time and excellent stability for glucose. At the same time the prepared ECL biosensor showed good reproducibility, sensitivity and selectivity. (C) 2014 Elsevier B.V. All rights reserved.
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