The sensitivity and stability of carbon paste enzyme elearodes are greatly enhanced through the incorporation of fumed silica within the paste matrix. The improved performance is attributed to the adsorptive and electrocatalytic properties of the silica nanoparticles. The electrocatalytic action results in a substantial lowering of the overvoltage for both the oxidation and reduction of the enzymatically liberated peroxide species. Highly selective, low‐potential, biosensing of glucose is thus accomplished in the presence of coexisting acetaminophen, ascorbic acid, or uric acid. The enhanced performance accrued from the presence of silica is also illustrated for mediator (dimethyl ferrocene)‐containing pastes. High enzymatic activity is maintained over prolonged periods. The silica modification strategy provides an effective, fast, and inexpensive route for immobilizing enzymes within carbon paste matrices.
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Wang et al. (1994) studied this question.
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