Optimization of alcohol precipitation process for Quhan Zhufeng Granules by overall desirability and central composite design
Objective To optimize the alcohol precipitation process of Quhan Zhufeng Granules.Methods Taking the volume fraction of ethanol,the relative density of the concentrated solution and the standing time as the investigation factors,the Z value of the total evaluation of gentiopicrin content,oleanolic acid content and dry paste yield of gentiana macrophylla as the evaluation indexes,the star-point design-response surface method was used to optimize the alcohol precipitation process.Results The optimal the alcohol precipitation process of Quhan Zhufeng Granules:concentration relative density 1.08 g/ml(90-95 ℃),alcohol precipitation at the end of volume fraction of 62%ethanol,standing for 16 h.Conclusion The alcohol precipitation process using overall desirability and central composite design is stable and feasible,and has good predictability,which can provide experimental basis for further scale production.