Figure 4 Flow-injection analysis of 95 nM bovine insulin (MW 5733) by oxidation at a mvRuOx-coated electrode. (From J.A.Cox and T.J.Gray, Anal. Chem, 61, 2462, 1989, with permission of the publisher). The conditions are those in Figure 2 with an applied potential of 0.96 V vs. Ag/AgCl.

doi:10.1201/9780203908907-182

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Figure 4 Flow-injection analysis of 95 nM bovine insulin (MW 5733) by oxidation at a mvRuOx-coated electrode. (From J.A.Cox and T.J.Gray, Anal. Chem, 61, 2462, 1989, with permission of the publisher). The conditions are those in Figure 2 with an applied potential of 0.96 V vs. Ag/AgCl.

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ABSTRACT

Ethanol is an important analyte in clinical chemistry and in biotechnology. Cataldi et al. [15] used mvRuOx-coated glassy carbon as the working electrode in the amperometric determination of ethanol by flow-injection analysis. A gradual loss of amperometric response to ethanol was observed even in acidic media. Inclusion of RuCl3 and K4Ru(CN)6 in the carrier solution electrolytically replaced the lost catalytic sites, thereby providing stability. The instability that was observed was attributed to the high concentration of analyte in this study (5-250 mM).