大孔树脂纯化荔枝核总黄酮工艺研究

目的筛选适合分离和纯化荔枝核总黄酮的大孔吸附树脂,并确立其纯化工艺参数,以期制备出符合中药有效部位要求的荔枝核总黄酮,为将荔枝核总黄酮开发成中药五类新药奠定基础。方法采用静态吸附-洗脱试验筛选纯化荔枝核总黄酮的大孔吸附树脂,在单因素实验基础上,以吸附率等综合评分为指标,考察乙醇体积分数、上样液质量浓度、上样液pH值、径高比、上样体积、上样体积流量、洗脱液体积分数、洗脱液体积及洗脱体积流量对其纯化工艺的影响,并确定最佳纯化工艺参数。结果 AB-8型大孔吸附树脂纯化荔枝核总黄酮的最佳工艺参数为树脂与药材的质量比3∶1,上样液质量浓度为4～6 mg/mL,上样体积流量1 mL/min,上样体积2 BV,径高比1∶12,上样液pH为2,洗脱时先以20%乙醇3 BV除杂,再用60%乙醇3 BV洗脱,洗脱体积流量4 mL/min。结论 AB-8型大孔吸附树脂可以纯化荔枝核总黄酮,在所确定的纯化工艺参数下,荔枝核总黄酮质量分数从29.22%升至平均67.37%,固形物由1.25 g减少至0.40 g,建立的工艺稳定、可行,可作为荔枝核总黄酮的纯化工艺条件。

Study on purification of total flavonoids from Litchi Semen by macroporous resin

Objective To screen the macroporous adsorption resin suitable for the separation and purification of total flavonoids from Litchi Semen, and the purification process parameters were established to prepare the total flavonoids of Litchi Semen in accordance with the requirements of effective parts of Chinese materia medica, which laid the foundation for the development of the total flavonoids of Litchi Semen into five new Chinese medicines. Methods The macroporous adsorption resin for purifying the total flavonoids of Litchi Semen by static adsorption-elution test was used. Based on the single factor test, the comprehensive score of adsorption rate was used as the index to investigate the volume fraction of ethanol, the mass concentration of the sample, and the sample solution pH, diameter to height ratio, upper column volume, upper column flow rate, eluent concentration, eluent volume and elution flow rate on the purification process, and determine the optimal purification process parameters. Results The best process condition for separating the total flavonoids of Litchi Semen by AB-8 macroporous adsorption resin were as follows:the mass ratio of resin to medicinal material was 3:1, the concentration of the upper column sample solution was 4-6 mg/mL, sample flow rate was 1 mL/min, and the upper column volume was 2 BV, diameter to height ratio was 1:12, pH of the sample solution was 2, first impurity removal by 20% ethanol 3 BV, and using 60% ethanol 3 BV for elution, elution flow rate was 4 mL/min. Conclusion AB-8 macroporous resin can be used to purify the total flavonoids of Litchi Semen under the established technological conditions. The mass fraction of total flavonoids in Litchi Semen increased from 29.22% to an average of 67.37%, and the solid content decreased from 1.25 g to 0.40 g. It indicates that the established purification process is stable and feasible, and can be used as a purification process condition for total flavonoids of Litchi Semen.