Page 98 - Pharmd general phytochemistry I-Final2024_LEUCTERS

Herbal preparations containing tannins are used for:
 Stop local small hemorrhages, sore mouth.
 Bronchitis.
 Burns, scars of the skin, wounds.
 Diarrhea.
 Antioxidant

True tannins are distinguished into two main classes, the
hydrolysable tannins and the condensed tannins.

Hydrolysable tannins:
 These can be hydrolyzed by acids or enzymes to give phenolic acids

(gallic or ellagic) and glucose, So, they are considered as phenolic
acids glycosides.

 Their molecule is built up of central glucose whose hydroxyl groups

are all esterified by phenolic acids.

 Tannins of gallic acid are called gallitannins, and those of ellagic acid

or hexahydroxydiphenic acid are called ellagitannins.

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