Tannic Acid CAS 1401-55-4

Gallotannin, Tannin

Synonyms: tannic acid, tannic acid, tannin acid, tannin, difold acid, larch gum, gallic tannic acid, tannin, tannic acid, tannic acid, soft acid.

EINECS Number: 215-753-2

Chemical Formula: C76H52O46

Relative Molecular Weight: 1701.20

Characteristics: Light yellow to light brown amorphous powder or loose shiny scaly or spongy solid, blackened when exposed to air. It is odorless, has a slight peculiar odor, has a strong astringent taste, and darkens in the light and air. Soluble in water, easily soluble in ethanol, acetone and glycerin, almost insoluble in ether, benzene, chloroform and petroleum ether. It has a slight special smell and a strong astringent taste.

Melting point: 210~215°C

Flash point: 187°C

Storage: suitable for storageaway from light

Wrap; 25kg bag

Uses: Precipitation and gravimetric determination of beryllium, aluminum, gallium, indium, niobium, tantalum and zirconium. Ratio determination of copper, iron, vanadium, cerium and cobalt. Precipitant for proteins and alkaloids. Ammonium molybdate external indicator when titrating lead. Dye mordant. It can also be used as an astringent, which can predispose proteins and form insoluble complexes with alkaloids, glycosides and heavy metals. Mainly used locally, its 11% to 20% ointment is used for exudative ulcers, burns, bedsores, hemorrhoids, eczema, etc., its 15% to 20% glycerin solution is used for stomatitis, tonsillitis and pharyngitis, etc., but also for detoxification, for the poisoning of dehydrated morphine, strife, digitalis, lead, silver, copper, zinc, etc., its solution can be used to lavate the stomach, and now it has been replaced with other antidotes; When used for colonography, add 0.25-0.5% enema of this product to the barium sulfate enema to clean the colon and facilitate development.