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。

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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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