Phenyl-Pyridine Redox Mediators for Low-Noise Glucose Biosensors

The patent changes the chemical parameters of the electron transfer mediator by replacing potassium ferricyanide with osmium complexes (such as osmium hexamine) that have different stability characteristics. This parameter change allows the mediator to maintain both high reactivity with glucose dehydrogenase and enhanced stability under varying temperature and humidity conditions, resolving the contradiction between reactivity and stability.

The patent changes the electrochemical parameters of the mediator by using osmium complexes with different redox potentials compared to potassium ferricyanide. This parameter change reduces background current interference, thereby improving measurement precision for low concentration glucose detection while maintaining ease of manufacture through straightforward immobilization processes.

The patent changes the chemical identity parameter by selecting osmium complexes (such as osmium hexamine) instead of hexaamine ruthenium chloride. This parameter change achieves both high oxidation reduction stability and high reactivity with glucose dehydrogenase, as the osmium complex has optimal electrochemical properties that facilitate efficient electron transfer with the enzyme while maintaining stability.

The patent employs an osmium complex as an electron transfer mediator that acts as an intermediary between the glucose dehydrogenase active center and the electrode. This mediator facilitates efficient electron transfer even when the enzyme is immobilized at a distance from the electrode surface, thereby maintaining high electron transfer efficiency while preserving ease of manufacture through simple immobilization procedures.