正交试验优选沙枣中总鞣质的提取工艺

o optimize the extraction process of total tannin of Gansu Elaeagnus. The optimum extraction process of total tannin of Elaeagnus angustifolia was selected by orthogonal experimental design. The content of total tannin was chosen as the assessment index, and the EDTA complex metric titration was used for the measurement.Results showed that the optimum extraction process conditions were as follows: adding 10-fold 50% acetone, soaking 6 hours, and extracting for 3 hours by solution reflux. The optimum extraction process is reliable,with higher extracting ratio of the active components.