The disturbance of gallic acid and tea polyphonels on the B-Z oscillating system was studied. The influence of temperature, stirring rate and the point of sample injection on the induction period, oscillating period and amplitude were investigated. The results indicated that a well linear relationship existed between the changes of oscillating period (ΔT) and the concentration of gallic in 1.6×10-2 g/L-4.5×10-2 g/L, detection limit was 1.37 ×10-9 g/L. In addition, the concentration of tea polyphonels was determined by using BZ oscillating method, and the result is close to the UV spectrophotometry. The proposed method was successfully applied to determine tea polyphonels in green tea. The possible oscillating mechanism of tea polyphonels was also discussed.%研究没食子酸和茶多酚对B-Z振荡体系的扰动行为,考察反应温度、搅拌速率、进样点位置对诱导期、振荡周期和振幅的影响.结果表明:当没食子酸的浓度在1.6×10-2 g/L~4.5×10-2 g/L范围内时,其浓度与振荡周期的改变量存在良好的线性关系,检测限为1.37×10-9 g/L.另外,利用B-Z振荡体系对茶多酚提取液进行测定,其结果与紫外-可见分光度法接近,同时分析茶多酚可能的振荡机制.
展开▼
