CAJ | 학술논문

采用电沉积方法将丝氨酸席夫碱双核铜配合物修饰于玻碳(GC)电极表面制得了修饰电极.研究了[Cu_2L_2(4,4′-Bipy)]/GC电极的电化学性质, 并发现该电极对抗坏血酸(AA)具有良好的电催化氧化作用.考察了该电极作为AA传感器的操作条件, 结果表明: 修饰电极在pH=7.0的磷酸盐缓冲溶液(PBS)中,于-0.70～0.10 V的范围内,以50 mV·s~(-1)的扫描速率进行循环伏安扫描, 催化电流峰与AA浓度在0.2×10~(-4)～1.0×10~(-4)mol·L~(-1)范围内呈线性关系.这表明可利用该修饰电极对抗坏血酸作定量分析.对2种水果汁饮料中AA进行测定, 其果汁含量分别为0.0647 g·L~(-1)和0.125 g·L~(-1),相对标准偏差在2.4%～3.0%之间.
채용전침적방법장사안산석부감쌍핵동배합물수식우파탄(GC)전겁표면제득료수식전겁.연구료[Cu_2L_2(4,4′-Bipy)]/GC전겁적전화학성질, 병발현해전겁대항배혈산(AA)구유량호적전최화양화작용.고찰료해전겁작위AA전감기적조작조건, 결과표명: 수식전겁재pH=7.0적린산염완충용액(PBS)중,우-0.70～0.10 V적범위내,이50 mV·s~(-1)적소묘속솔진행순배복안소묘, 최화전류봉여AA농도재0.2×10~(-4)～1.0×10~(-4)mol·L~(-1)범위내정선성관계.저표명가이용해수식전겁대항배혈산작정량분석.대2충수과즙음료중AA진행측정, 기과즙함량분별위0.0647 g·L~(-1)화0.125 g·L~(-1),상대표준편차재2.4%～3.0%지간.
The Shiff-base copper complex was modified on the glassy carbon(GC) electrode through the method of electro-deposition. The electrochemical character of [Cu_2L_2(4,4′-biPy)]/GC was studied and it was found that this modified electrode had a good catalytic effect on ascorbic acid (AA). The operating conditions of this modified electrode as AA sensor were studied. The result showed that in phosphate buffer solution (PBS) (pH=7.0), the catalytic peak current had a linear relationship with the concentration of ascorbic acid in the range of 0.2 × 10~(-4)～1.0 × 10~(-4) mol·L~(-1), which indicated that the modified electrode could be used for the quantitative analysis of AA. The modified electrode was used to detect two kinds of fruit juice beverages with RSDs of 2.4%～3.0%.