Analytical applications of a carbon nanotubes composite modified with copper microparticles as detector in flow systems

ALBERTO SÁNCHEZ ARRIBAS, ESPERANZA BERMEJO, MANUEL CHICHARRO, ANTONIO ZAPARDIEL,GUILLERMINA L. LUQUE, NANCY F. FERREYRA, GUSTAVO A. RIVAS

ANALYTICA CHIMICA ACTA

ELSEVIER

Año: 2006 vol. 577 p. 183 - 183

0003-2670

font face="Helvetica" color="#e7e7e7" size="7"> In this work we report on the successful use of a composite prepared by dispersion of multi-wall carbon nanotubes (1–5 m length, 20–50 nm diameter) and copper microparticles within mineral oil as detector for amino acids quantification in flow injection analysis and capillary electrophoresis. The resulting electrode displays a highly sensitive amperometric detection of amino acids, based on the copper dissolution facilitated by the strong activity of amino acids as ligands of Cu(II). The sensor makes possible the detection of amino acids, electroactive or not, at very low potentials (0.000 V) and physiological pH. A correlation between the sensitivity for the amino acids and the amount of copper wit