Plant extracts use plants as raw materials, through physical and chemical extraction and separation processes, to obtain and concentrate one or more active ingredients in plants. Plant extracts can be widely used as materials in the health food industry. There are kinds of plant extracts, and there are more than 300 kinds of industrial extracts, which are classified into glycosides, acids, polyphenols, polysaccharides, terpenoids, flavonoids, alkaloids and so on.
Figure 1. Gynostemma extract.
Figure 2. Ginkgo biloba extract.
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