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We report an innovative supramolecular architecture for bienzymatic glucose biosensing based on the non-covalently functionalization of multi-walled carbon nanotubes (MWCNTs) with two proteins, glucose oxidase (GOx) (to recognize glucose) and avidin (to allow the specific anchoring of biotinylated horseradish peroxidase (b-HRP)). The optimum functionalization was obtained by sonicating for 10 min 0.50 mg mL?1 MWCNTs in a solution of 2.00 mg mL?1 GOx+1.00 mg mL?1avidin prepared in 50 : 50 v/v ethanol/water. The sensitivity to glucose for glassy carbon electrodes (GCE) modified with MWCNTs-GOx-avidin dispersion and b-HRP (GCE/MWCNTs-GOx-avidin/b-HRP), obtained from amperometric experiments performed at ?0.100 V in the presence of 5.0×10?4 M hydroquinone, was (4.8±0.3) muA mM?1 (r2=0.9986) and the detection limit was 1.2 muM. The reproducibility for 5 electrodes using the same MWCNTs/GOx-avidin dispersion was 4.0 %, while the reproducibility for 3 different dispersions and 9 electrodes was 6.0 %. The GCE/MWCNT-GOx-avidin/b-HRP was successfully used for the quantification of glucose in a pharmaceutical product and milk.
Avidin and Glucose Oxidase-non-covalently Functionalized Multi-walled Carbon Nanotubes: A New Analytical Tool for Building a Bienzymatic Glucose Biosensor
The result showed that such a combination of chemo- and biocatalysis improved the catalytic yield more than two times compared with that of sole metal catalysis. We will look forword to the important role of 1273-86-5, and how the biochemistry of the body works.Recommanded Product: 1273-86-5
Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion