Tannins

Commercia tannins

used from leather industry

from querbracho wattle, chesnut and myrobalsams

pharmaceutical tannins

from oak galls and yield glucose and gallic acid upon hydrolysis

Gallotannin

Coffea arabica

Gallotannin

Equisetium aarrense

Gallotannin

Glycrrhiza glabra

Gallotannin

Rhamnus purshianus

Gallotannin

Verbena officinalis

ID TEST gallotanin / tannic acid fecl3

bluish black ppt

Gallotannin

doensht precipitate in bromine ts

USES gallotannin

1. Manufacture of inks.
2. It is used for tanning
3. Pharmaceutical aid
4. Mordant in dyeing.
5. Clarify beer and wine.
6. Coagulant in the manufacture of rubber.
7. Production of gallic acid and pyrogallol.
8. A reagent in ‘analytical chemistry’.

Ellagitannins

*derived by the oxidative coupling of two molecules of gallic which are esterified to glucose or probably by the condensation of hydroaromatic percursors*

complex tannins

newly dicoverd group of tannin which are biosynthesized from both hydrolyzable and condensed tannins

Gallotannin

galiic acids

Gallotannin

hexadihydroxy diphenic acid

phlobatannins

condesed tannins, flavorans, cathechol tannins

phlobatannins

more resistant when treated with acid or enzymes

phlobatannins

prepitates with bromine ts

ID TEST phlobatannin FeCl3

greenish black

pseudotannins

compound of lower molecular weights than true tannins

pseudotannins

do not respond to goldsbeater skin test

pseudotannins

do not form leather but yield color with Fe salt

pseudotannins

have cathecins which gives rise to the peculiar odor

gallic acid

rhubarb

cathehins

coffee, nux vomica

ipecuacuanic acid

ipecacuanha

goldbeater’s skin test

brown, black on the skin

gelatin test

gallic acid and other pseudotannins precipitate gelatin

phenazone test

all tannins are precipetated (bulky)

test for catechin

phlorglucinol turns wood pink or red

test for chlorgenic acid

development of a green color

condensed tannins

acacia catechu / acacia chundra

condensed tannins

unicaria gambir

condensed tannins

pterocarpus marsupium

hydrolyzable tannins

quercus infectoria

hydrolyzable tannins

adleria gallaetinctoriae

hydrolyzable tannins

terminalia belerica

hydrolyzable tannins

hamamelidaceae

hamamelitannin

astringent and hemostatic

pseudotannins

coffea arabic

caffeine

salt of chlorgenic acid, volatile oiil known as caffeol, enzymes and other henolic principle

murexides test

white precipitate of tannin from caffeine

pseudotannins

camellia sinesis

other plants containing tannins

crataegeus monogyna

crataegus laevigata

other plants containing tannins

agrimonia eupatoria

other plants containing tannins

alchemillia xanthochloratannis

other plants containing tannins

krameria rhatany

pyrogallol

hydrolytic product of tannun

phlobaphene

nonhydrolytic product of tannin

bloom leather

leather type of hydrolyzable tannins

tanner’s red

leather type of non hydrolyzable tannins

hydrolyzable tannins

consist of gallic acid or related polyhydric compund esterfied w glucose

nonhydrolyzable tannins

most result from the the condestaition of 2 or more polyhydric compounds esterfied w/ glucose