随着再结晶次数的增加，晶体中的杂质浓度和缺陷浓度明显降低，晶体的耐辐射性能明显提高。
The concentration of impurity and defects in the crystals decreased dramatically, and the capability of irradiation-resistant improved synchronously as the increase of re-crystallization times.
通过对溶剂、提取次数、 碱化条件的选择，用离子交换和重结晶的方法提取纯化氧化苦参碱。
Through selecting extracting solvent, extracting times and alkalinizing method, Oxymatrine is extracted and purified by ion-exchanging and re-crystallization.
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