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The effect of proton donors (PD) on the direct electron transfer (ET) reaction between polycrystalline Au electrodes and horseradish peroxidase (HRP) was investigated. HRP was immobilised directly on the bare Au surface. The pH of the contacting solution was varied at a constant ionic strength and the following different PDs were used as additives: H 3 O + , NH 4+ , [La(H...
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