非线性振荡化学指纹图谱技术应用于回心草药材的定性定量分析研究

Qualitative and quantitative analysis of Rhodobryum giganteum by using nonlinear oscillating chemical fingerprint technique

该文采用振荡化学指纹图谱技术建立一种暖地大叶藓回心草药材的定性定量分析新方法,完善云南习用药材回心草的质量控制标准。运用电化学工作站记录暖地大叶藓回心草在BrO-3-Ce(SO4)2-H2SO4-丙二酸/酒石酸振荡反应体系下,电位(E)随时间(t)的变化。对非线性振荡化学指纹图谱技术进行重复性考察,发现暖地大叶藓4个特征参数RSD≤4.1%,说明该方法重复性好,精密度高。通过考察不同粒度、转速及温度对振荡曲线特征参数的影响,在最优实验条件下以诱导时间、振荡周期为定量指标的特征参数,与中药加入剂量(0.1~1.1 g)线性关系较好,相关系数分别为0.978和0.975。最高电位与中药加入量呈现非线性关系,其相关系数高达0.999。此外,还将此方法用于暖地大叶藓回心草和大叶藓回心草的判别分析,二者外观相似,但指纹图谱差异较大,独立样本t检验结果表明,二者的特征参数诱导时间、振荡时间、最大振幅、振荡周期差异明显,为回心草药材基源鉴别提供了依据。

A new method for qualitative and quantitative analysis of Rhodobryum giganteum by using the nonlinear oscillating chemical was established for improving the quality control standard of R. giganteum. Its potential(E)/time(t) curve was recorded by electrochemical workstation in the oscillation reaction system of BrO-3-Ce(SO4)2-H2SO4-malonic acid/tartaric acid. The nonlinear oscillating chemical fingerprints were investigated for repeatability, and it was found that the RSD values of the four characteristic parameters of R. giganteum were less than 4.1%, indicating a good repeatability and high precision of this experiment. After optimizing the experimental parameters such as particle size, rotation speed and temperature, a new method based on nonlinear oscillating chemical was used for qualitative and quantitative analysis of R. giganteum. The results showed that there was a good linear relationship between the induction time/the period of oscillation and the dosage of herbs(0.1-1.1 g), with the relative coefficients of 0.978 and 0.975, respectively. Besides, the highest potential showed a nonlinear relationship with the dosage of herbs, with the relative coefficient of 0.999. This method was also used to discriminate the R. giganteum and R. roseum. They were similar in appearance, but their fingerprints were quite different. Independent sample t test results showed that there were significant differences in the oscillation time, the maximum amplitude and the induction time, providing a basis for the identification of the basic sources of Herba Rhodobryi Rasei.