黄酮类物质具有优良的防腐抗菌效果,但从植物中提取和纯化技术尚不成熟,为此探讨了油竹干黄酮提取液的大孔树脂纯化工艺。通过7种不同型号大孔树脂对黄酮粗提液的吸附与解吸实验,优选出AB-8型大孔树脂;并得出油竹干黄酮提取液的最佳纯...黄酮类物质具有优良的防腐抗菌效果,但从植物中提取和纯化技术尚不成熟,为此探讨了油竹干黄酮提取液的大孔树脂纯化工艺。通过7种不同型号大孔树脂对黄酮粗提液的吸附与解吸实验,优选出AB-8型大孔树脂;并得出油竹干黄酮提取液的最佳纯化条件为:1.0 mg/m L黄酮水溶液,上样液p H为6.0,上样速度为1.0 m L/min,最大上样量为170 m L;采用浓度为60%的乙醇进行洗脱,洗脱速度为1.5 m L/min,其用量为120 m L。此条件下纯化效果最佳,竹干黄酮样品纯度由21.3%提高到50.85%。展开更多
In his paper On rotated veotor fields and the global behavior of limit cycles of a class of quadratic system in the plane (J. Diff. Eqs., 18(1975), 63—86), L. Perko studied the properties of a semicomplete family (mo...In his paper On rotated veotor fields and the global behavior of limit cycles of a class of quadratic system in the plane (J. Diff. Eqs., 18(1975), 63—86), L. Perko studied the properties of a semicomplete family (mod P).展开更多
文摘黄酮类物质具有优良的防腐抗菌效果,但从植物中提取和纯化技术尚不成熟,为此探讨了油竹干黄酮提取液的大孔树脂纯化工艺。通过7种不同型号大孔树脂对黄酮粗提液的吸附与解吸实验,优选出AB-8型大孔树脂;并得出油竹干黄酮提取液的最佳纯化条件为:1.0 mg/m L黄酮水溶液,上样液p H为6.0,上样速度为1.0 m L/min,最大上样量为170 m L;采用浓度为60%的乙醇进行洗脱,洗脱速度为1.5 m L/min,其用量为120 m L。此条件下纯化效果最佳,竹干黄酮样品纯度由21.3%提高到50.85%。
文摘In his paper On rotated veotor fields and the global behavior of limit cycles of a class of quadratic system in the plane (J. Diff. Eqs., 18(1975), 63—86), L. Perko studied the properties of a semicomplete family (mod P).
