Fabrication of a Trimethylamine Gas Sensor Based on Electrochemiluminescence of Ru(bpy)$\rm{ {_{3}^{2+}}}$/Nafion Gel and Its Application to a Freshness Sensor for Seafood

The present sensor on the basis of electrochemiluminescence generated from Ru(bpy)/ anionic perfluoropolymer Nafion coated electrode responded strongly to trimethylamine gas. The response gave a straight line in the concentration ranging from 10 to 310 ppb and the lower detection limit was 3 ppb (S/N =3). The sensor was applied to seafood as practical samples and the response for a squid was almost consistent with a profile curve obtained from the K value measurement as an alternative freshness index.