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目的:建立甘草的非线性指纹图谱。方法:以H_2SO_4-Ce(SO_4)_2(NH_4)_2SO_4-CH_3COCH_3-KBrO_3为化学振荡体系,甘草为反应底物,应用电化学工作站记录电位(E)随时间(t)的变化,绘制E-t曲线,考察各种因素对曲线的影响。结果:通过实验确定了最佳的反应条件,在300~325 K反应的平均活化能:E_(in)=84.69 kJ·mol~(-1),E_p=72.90 kJ·mol~(-1),样品的相似度较好,甘草与伪品相比非线性指纹图谱有明显区别,聚类分析将样品最终聚为两类。结论:该方法可用来鉴别甘草。
Objective: To establish a nonlinear fingerprint of licorice. Methods: The Et curve was drawn by using electrochemical workstation with the chemical oscillation system of H_2SO_4-Ce (SO_4) _2 (NH_4) _2SO_4-CH_3COCH_3-KBrO_3 and the reaction substrate of licorice root. Electrochemical workstation was used to record the change of potential (E) Investigate the impact of various factors on the curve. Results: The optimum reaction conditions were determined by experiments. The average activation energies at 300 ~ 325 K were E_ (in) = 84.69 kJ · mol ~ (-1), E_p = 72.90 kJ · mol ~ (-1) The similarity of the sample is better, the nonlinear fingerprint of licorice is obviously different from the counterfeit, and the cluster analysis finally converges the sample into two types. Conclusion: This method can be used to identify licorice.