机构地区: 西北师范大学化学化工学院
出 处: 《分析测试学报》 2011年第11期1311-1315,共5页
摘 要: 考察了D-和L-苯丙氨酸对碱性条件下Cu(Ⅱ)催化振荡体系的影响,结果表明,两者均可使体系的电位发生明显变化,但对体系的影响程度不同。当D-苯丙氨酸的浓度在1.80×10-9~1.40×10-4 mol.L-1范围内时,其浓度的负对数与振幅的改变量ΔA之间呈良好的线性关系,相关系数为0.996 3,检出限(LOD)为2.69×10-11 mol.L-1;L-苯丙氨酸的线性范围为1.80×10-6~1.80×10-4 mol.L-1,相关系数为0.995 8,检出限为2.61×10-7 mol.L-1。该法成功用于饮料和模拟水样中L-苯丙氨酸的测定,并对可能的反应机理进行了讨论。 The effects of D- and L-phenylalanine on the Cu ( Ⅱ )-catalyzed oscillating chemical reaction in an alkaline medium were investigated in this paper. The results showed that the changes of amplitude(AA) after adding D- and L-phenylalanine were different. The changes of the amplitude were linearly proportional to the negative logarithm concentration of D-phenylalanine in the range of 1.80 ×10^ -9 _ 1. 40×10^-4 mol · L^-1 ( r = 0. 996 3 ) with detection limit (LOD) of 2.69×10^-11 mol · L^-1 , and for L-phenylalanine in the range of 1.80×10^-6 - 1.80 ×10^-4 mol · L^-1 (r =0. 995 8) with detection limit of 2. 61×10^ -7 mol · L^-1. The proposed method was successfully used for the determination of L-phenylalanine in beverage and simulating water sample. The possible reaction mechanism was also discussed.