Question

How to convert tannic acid to gallic acid?

Answer 1

Tannic Acid Fermentation
well as the tannin of sumach and chestnut. The pathological
tannins are hydrolyzed by boiling with acids or through the action
of the enzyme tannase, gallic acid resulting. For other distin-
guishing characteristics of the tannins Trimble’s* and Proctor’s3
treatises may be consulted, and for a discussion of the diverse
views held regarding their chemistry reference should be made to
special papers on the subject.
This paper is concerned with the fermentation of the tannin
from oak galls, which is frequently termed gallotannic acid.

Answer 2

Explanation:

Tannic acid is found in the nutgalls formed by insects on the twigs of certain oak trees. Purified tannic acid is sometimes used as medicine.

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