Direct electrochemistry of glucose oxidase immobilized on a hexagonal mesoporous silica-MCM-41 matrix

Graphene Based Electrochemical Sensors and Biosensors: A Review

“…The formal potential (E8') calculated by averaging the cathodic and anodic peak potentials was estimated to be ca. À 0.43 V (all the electrode potentials are vs. Ag/AgCl, except specially stated), close to the standard electrode potential of FAD/FADH 2 [92,93]. The redox peaks of GOD have ca.…”

A bienzyme channeling glucose sensor with a wide concentration range based on co-entrapment of enzymes in SBA-15 mesopores

“…The detection limit of 0.25 M at a signal-to-noise ratio of 3 was also much lower than 180 M based on GOD adsorbed mesoporous composite material of no. 41 (MCM-41) modified GCE (Dai et al, 2007) and 20 M at a ultrasmall platinum (Hrapovic and Luong, 2003). Obviously the co-entrapment of GOD and HRP in the same mesopores of SBA-15 greatly increased the sensitivity, widened the linear range and deduced the detection limit.…”

Electroanalytical Applications of Microporous Zeolites and Mesoporous (Organo)Silicas: Recent Trends

“…Beside this bilayer arrangement of mesoporous particles covered with a polymer, single composite layers made of mesoporous particles dispersed into a polymeric matrix were also prepared as thin films on electrode surfaces. This was performed by dissolving a polymer (mostly poly(vinyl alcohol) [183 -189], but also polystyrene [190,191], poly(-vinyl chloride) [192,193], Nafion [194], poly(4-vinylpyridine) [195] or an acrylate-based copolymer [196]) in the suspension containing the particulate material, resulting in the encapsulation of the mesoporous particles within the interpenetrated polymer chains upon solvent evaporation. Note that these mesoporous silica-polymer composite films, though ensuring satisfactory immobilization of the solid of interest onto the electrode surface, are not made of coherent deposits consisting solely of mesoporous material so that the binder can interfere in their electrochemical behavior.…”