摘要:
将四(5,6 二氢1,4 二噻英)四氮杂卟啉(FePz(dtn)4)通过电沉积的方式固载在玻碳电极上,该电极在抗坏血酸(AA)和尿酸(UA)等干扰物存在下,可选择性地检测多巴胺(DA).对比裸电极,在循环伏安测量中修饰过后的电极在氧化电位处对DA表现出良好的电催化活性.并且出现一对可逆的氧化还原峰,阳极和阴极的电位值分别为0.182V和0.142V.在电解质溶液中氧化峰电流随着DA的浓度线性增加.两个线性范围分别是1~10和10~200μg/mL,相关系数分别为0.9967和0.9988.检出限为0.3μg/mL.
Abstract:
Glassycarbon(GC)electrodewasmodifiedwithanelectropolymerizedfilmof(iron(Ⅱ)-tetra(5,6-dihydro-1,4-dithijn)porphyrazine)(FePz(dtn)4).Thepolymerfilm-modifiedelectrodewasusedtoelectrochemicallydetectdopamine(DA)inthepresenceofascorbicacid(AA)anduricacid(UA).Incyclicvoltammetricmeasurements,thepolymerfilmshowedanexcellentelectrocatalyticactivityastheoxidationpotentialforDAwaspositivelyshiftedcomparedtothatatthebareelectrode.Acoupleofreversibleredoxpeaksweredetected,thepotentialvalueoftheanodicandthecathodicpeaksbeing0.182and0.142V,respectively.TheoxidationpeakcurrentincreasedlinearlywiththeconcentrationofDAintheelectrolyticsolution,withalinearrangeof1-10and10-200μg/mLandacorrelationcoefficientof0.9967and0.9988,respectively.Thedetectionlimitwas0.3μg/mL.
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