članak: 1 od 1  
Journal of the Serbian Chemical Society
2010, vol. 75, br. 12, str. 1685-1699
jezik rada: engleski
izvorni naučni članak
doi:10.2298/JSC100311134E
Voltametrijsko određivanje dopamina u prisustvu mokraćne kiseline na elektrodi od staklastog ugljenika modifikovanog 2-hidroksi-1(1-hidroksi naftil-2-azo)-naftalin-4-sulfonskom
Ensafi Asghar Ali, Dadkhah-Tehrani Samira, Rezaei Behzad
Department of Chemistry, Isfahan University of Technology, Isfahan, Iran

e-adresa: ensafi@cc.iut.ac.ir

Sažetak

Polimerni film 2-hidroksi-(1-hidroksinaftil-2-azo)-naftalin-4-sulfonske kiseline je formiran na elektrodi od staklastog ugljenika postupkom elektrohemijske polimerizacije. Tako modifikovana elektroda je korišćena za istovremeno određivanje dopamina (DA) i mokraćne kiseline (MK). Elektrohemijsko ponašanje ovih jedinjenja na modifikovanoj elektrodi je ispitivano cikličnom voltametrijom, hronoamperometrijom i voltametrijom sa pravougaonim signalom. Eksperimentalni rezultati pokazuju da modifikovana elektroda predstavlja efikasan katalizator za oksidaciju DA i MK uz separaciju pikova od oko 140 mV pri pH 5,0. Konstanta brzine katalizovane reakcije određena je metodom hronoamperometrije i iznosi 1,23×104 mol-1 L s-1. U merenjima voltametrijom sa pravougaonim signalom u rastvoru pH 5,0 strujni pikovi su pokazali linearnu zavisnost od koncentracije DA i/ili MK u opsegu 1,0-300 µmol L-1 DA (dve linearne oblasti sa različitim nagibima) i 6,7-20 µmol L-1 MK. Granice detekcije za DA i MK su bile 0,25 i 1,17 µmol L-1, redom. Standardna devijacija za 140,0 µmol L-1 DA je iznosila 1,9 i 2,2%, a za 10,0 i 20,0 µmol L-1 MK 1,8 i 1,2%, redom. Modifikovana elektroda je pokazala visoku osetljivost, selektivnost i stabilnost. Takođe je uspešno primenjena i za određivanje DA i MK u realnim uzorcima kao što su lekovi i urin.

Ključne reči

2-hydroxy-1-(1-hydroxynaphthyl-2-azo)-naphthalin-4-sulfonic acid; simultaneous determination; dopamine and uric acid; voltammetry

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