initial form purity 基本纯度
This is a costly and time-consuming process in which much of the initial purity of the GeCl4 is lost.
这是昂贵费时的工艺，其中GeCl4的初始纯度被大大损失。
Mature leaves contain more initial metabolites, such as phenols, polysaccharides, lipids and other substances, and the DNA contained in a relatively small, so it is difficult to extract a low purity.
成熟叶片中含有较多的初次生代谢产物如酚类、多糖类、脂类等物质，而且所含DNA相对较少，所以提取难度大，纯度低。
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