Glutathione-capped CdTe quantum dots for the sensitive detection of glucose.
A simple and sensitive assay system for glucose based on the glutathione (GSH)-capped CdTe quantum dots (QDs) was developed. GSH-capped CdTe QDs exhibit higher sensitivity to H(2)O(2) produced from the glucose oxidase catalyzed oxidation of glucose, and are also more biocompatible than other thiols-capped QDs. Based on the quenching of H(2)O(2) on GSH-capped QDs, glucose can be detected. The detection conditions containing reaction time, the concentration of glucose oxidase and the sizes of QDs were optimized and the detection limits for glucose was determined to be 0.1 microM; two detection ranges of glucose from 1.0 microM to 0.5mM and from 1.0 mM to 20 mM, respectively were obtained. The detection limit was almost a 1000 times lower than other QDs-based optical glucose sensing systems. The developed glucose detection system was simple and facile with no need of complicated enzyme immobilization and modification of QDs.
Yuan
Jipei
J
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, Changchun, Jilin 130022, China.
Guo
Weiwei
W
Yin
Jianyuan
J
Wang
Erkang
E
D019187:Cadmium Compounds; D005947:Glucose / Q000032:analysis*; D005949:Glucose Oxidase / Q000378:metabolism; D005978:Glutathione; D006861:Hydrogen Peroxide / Q000032:analysis; D045663:Quantum Dots; D013691:Tellurium
D019187:Cadmium Compounds; D006861:Hydrogen Peroxide; D005949:Glucose Oxidase; D005978:Glutathione; D005947:Glucose; D013691:Tellurium; C028337:cadmium telluride