B&M polyamide column used in accordance with the inverse mechanism, through the compound hydroxyl groups with strong hydrogen bonds between amides groups of the resin, adsorption from aqueous solution or methanol solution polar compounds (- OH groups, especially the phenolic compounds),which used for extraction of tannins, chlorophyll, humic acid and pharmacological activities of terpenoid, flavonoids,gallic acid, catechin, protocatechuic acid and A phloroglucinol is used to extract aromatic carboxylic acid and keeping the irreversible benzoquinone nitro aromatic compounds.

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