Département de chimie moléculaire

Single-walled carbon nanotubes (SWCNTs) deposits on glassy carbon and pyrolytic graphite electrodes have dramatically enhanced the direct electron transfer of the multihemic nitrite reductase from Desulfovibrio desulfuricans ATCC 27774, enabling a 10-fold increase in catalytic currents. At optimal conditions, the sensitivity to nitrite and the max. c.d. were 2.4 ± 0.1 A L mol-1 cm-2 and 1500 $μ$A cm-2, resp. Since the biosensor performance decreased over time, laponite clay and electropolymd. amphiphilic pyrrole were tested as protecting layers. Both coating materials increased substantially the bioelectrode stability, which kept about 90{%} and 60{%} of its initial sensitivity to nitrite after 20 and 248 days, resp. [on SciFinder(R)]