Correlation between chemical composition in processof Isatidis Radix preparation and its pharmacological activity / 中草药

ABSTRACT

Objective: To investigate the key factors in the process of IsatidisRadix (IR)preparation. The content changes of its main chemical ingredients (epigoitrin, uridine, guanosine, adenosine, and indirubin) and the correlation with its pharmacological activity had been studied, which would providetheoretical foundation for further optimization of process. Methods: The process of IR preparation (extracting-concentrating-alcohol sinking-drying-granulation) was simulated. HPLC was employed to determine the contents of the chemical ingredients in each step of IR preparation, and the clearance rate of OH•was used as the model to investigate the antioxidant activity. Cluster analysis, partial least sqμares (PLS), and multiple linear regression (MLR) were used to analyze the correlation between its chromatogram and pharmacological activity. Results: The content changes of chemical ingredients from IR preparation were generally decreased on the whole, and the highest loss rate of chemical ingredients occurred in the concentrating-drying process; Two metrological methods had been used toanalyze the correlationand the chromatogram ofindirubin, guanosine, and adenosine, which was positively related with the clearance rate of OH•.Conclusion: Each step in the process of IR preparation had the significant effect on the content of its chemical ingredients and pharmacological activity. The concentrating and drying process may be the key process which would finally influence the quality of preparation. Indirubin, guanosine, and adenosine may be the effective substances of IR with antioxidant activity.