Because of the structure diversity

Because of the structure diversity of alkaloids, there is no single method

of their extraction from nature raw materials. Most methods exploit the property

of most alkaloids to be soluble in organic solvents but not water. Most alkaloids

are present in the raw plants in the form of salt of organic acids. Usually

inorganic acidic extraction is used, so that the organic acid of alkaloids salt is

replaced inorganic acid salt, and increasing its solubility. The advantage of

acidic extraction is changing alkaloids molecules into small molecular organic

acid salts, increasing the solubility in water, Each monomer of alkaloids often

has different alkaline, we can use the pH gradient extraction to separate. For

example, separating A and D agent from the bark that is using their different

alkaline, have the concentrated solution basified to leach in pH9-10. A agent

was extracted of its low alkaline but B agent whose pH is higher than A agent.

Precipitation method separate water-soluble impurities which remaining in the

filtrate, in order to obtain higher purity water-soluble alkaloids or salts.

Results (English) 3:

由于生物碱的结构多样性，没有单一的方法，其提取

自然原料。大多数方法利用大多数生物碱性质

在有机溶剂中是可溶的但不是水。大多数生物碱

中有机酸盐的形式存在的原植物。通常

无机酸性提取方法，因此，生物碱盐的有机酸为

取代无机酸盐，并增加其溶解度。利用酸性提取

生物碱分子转变为小分子有机酸盐

，增加在水中的溶解度，各单体生物碱常

具有不同的碱性，可以用pH梯度萃取分离。

为例，分离和D从树皮，使用不同

碱剂，有浓溶液碱化浸ph9-10。一剂

是低碱性但B剂的pH值高于剂提取。

沉淀法分离水溶性杂质残留在

滤液，为了获得高纯度的水溶性生物碱或盐。