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(ΔA) 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.
关键词
苯丙氨酸化学振荡饮料检测
Keywords
phenylalanineoscillating chemical reactionbeveragedetermination