Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2008.3654.3661M. ZarehMohsen 122008820Two types of electrochemical sensor were introduced
for the selective determination of dopamine. Both potassium tetrakis-[3,5-bis-(trifloromethyl)-phenyl]
borate (K-TFPB) and a synthesized N,N-bis-ethoxycarbonyl-1,10-diaza-4,7,13,16-tetraoxacyclo-octadecane
(DZCE) were used as charged ionophore and a neutral carrier. The calibration
graphs of the obtained electrodes showed satisfactory Nernstian slopes
(57.8 and 58.4 mV/decade). The optimum pH value was 3.5-8.3 for both electrodes.
Selectivity coefficients of the studied electrodes were calculated towards
several inorganic cations, aminoacids and pharmaceutical compounds. The
Relative Selectivity Coefficient (RSC) was introduced and was applied
for evaluating the selectivity properties of dopamine electrode using
Zareh`s equation. Average Relative Selectivity Coefficient (ARSC) and
Total Average Relative Selectivity Coefficient (TARSC) were defined and
calculated as new parameters for each electrode. An improvement of the
selectivity coefficient values was observed when (DZCE) was added as neutral
carrier to the membrane constituents. The electrode was applied for the
determination of dopamine in its pharmaceutical preparations.]]>Abdulrahman, L.K., A.M. Al-Abachi and M.H. Al-Qaissy,2005538331335Alpat, S., S.K. Alpat and A. Telefoncu,2005383695700Benes, F.M.,2001224647Cheng, Q., T.Z. Peng, X.B. Hu and C.F. Yang,20053828084Guilbault, G., R. Drust, M. Frant, H. Freiser and H. Hansen et al.,197648127132Hayashi, K., Y. Iwasaki, R. Kurita, K. Sunagawa and O. Niwa,2003510371042Hodgkinson, L.C., M. R.Johnson, S.J. Leigh, N. Spencer and I. O. Sutherland,1979121932202Júnior, L.R., J.C.B. Fernandes, G. De Oliveira Neto and L.T. Kubota,20004813441Kooshki, M. and E. Shams,2007587110115Lai, G.S., H.L. Zhang and C.M. .Jin,200719496501Lima, J.L.F.C. and M.C.B.S.M. Montenegro,1999131187190Lin, X. and J. Gong,2004507259265Liu, K.Y. and R.Q. Yu,19903314661480Mamiński, M., M. Olejniczak, M. Chudy, A. Dybko and Z. Brzózka,2005540153157Mazzei, F., F. Botre, M. Lanzi, G. Lorenti and F. Porcelli et al.,19927427430Montenegro, M.C. and M.G. Sales,200089876884Nalewajko, E., A. Wiszowata and A. Kojło,20074316731681Othman, A.M., N.M. Rizka and M.S. El-Shahawi,200420651655Romphophak, T., J. Siriphanich, U. Yoshinori, A. Kazuhiro and C. Kazuo,2005491721Saijo, R., H. Murakami, S. Tsunekawa, S. Imanishi and N. Shirai et al.,200755417421Sotomayor, M.D.P.T., A.A. Tanaka and L.T. Kubota,20025367181Tu, Y.F. and H.Y. Chen,2002171924Zareh, M.M., E. Malinowska and K. Kasiura,20014475561Nour El-Dien, F.A., M.A. Zayed, Gehad G. Mohamed, and Reham G. El-Nahas, M. A. Zayed, G.G. Mohamed and R.G. El-Nahas, 2005119