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The objective is to establish a method to determine the content of protocatechuic acid in Scutellaria barbara.
目的是要建立测定黄芩中原儿茶酸含量的方法。
Furthermore, the content of glucose and galacturonic acid were higher in sweet potato pectin.
同时，甘薯果胶中半乳糖醛酸和葡萄糖的含量较高。
Methods: color reaction of free amino acids with ninhydrin was adopted, since, in certain extent, the color depth is correlated with the amino acid content.
方法：采用氨基酸的游离氨基与水合茚三酮产生显色反应，在一定范围内，其颜色的深浅与氨基酸的含量成正比。
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