title: Selective response of dopamine in the presence of ascorbic acid on carbon paste electrode modified with titanium phosphated silica gel.
abstract: Titanium phosphate grafted on the surface of silica gel (devoted briefly as Si-TiPH) was synthesized and used as bulk modifier to fabricate a renewable three-dimensional chemically modified electrode. The Si-TiPH bulk modified carbon paste electrode was used for the selective determination of dopamine (DA) in the presence of ascorbic acid (AA). The modified electrode offers an excellent and stable response for the determination of DA in the presence of AA. The differential pulse voltammetry peak current was found to be linear with the DA concentration in the range 2 x 10(-7) to 1 x 10(-6) and 2 x 10(-6) to 6 x 10(-5) mol L(-1). The detection limit of the proposed method in the presence of 2.0 x 10(-5) M of AA was found to be 4.3 x 10(-8) mol L(-1) for DA determination. The proposed method was successfully applied for the determination of DA in injections.
authors: Institute for Advanced Studies in Basic Sciences, Zanjan 45195-1159, Iran.
authors: Mojtaba
authors: M
authors: Kooshki
authors: Esmaeil
authors: E
authors: Shams
mesh_terms: D001205:Ascorbic Acid / Q000032:analysis* / Q000737:chemistry; D002244:Carbon / Q000737:chemistry*; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D004298:Dopamine / Q000032:analysis* / Q000737:chemistry; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D005782:Gels; D006863:Hydrogen-Ion Concentration; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D058428:Silica Gel; D012825:Silicon / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D005782:Gels; C036532:titanium phosphate; D058428:Silica Gel; D002244:Carbon; D012822:Silicon Dioxide; D014025:Titanium; D001205:Ascorbic Acid; D004298:Dopamine; D012825:Silicon