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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。
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.
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