TANNIN

TANINS

These are organic compounds if butter taste which Occur in different plants tissues. They

 

are mostly

have an acid reaction and are very astringent.

 

glucosidal. Generally

 

they

 

metabolic waste

 

are regarded

 

They

 

as

 

Droducts, since they tend to accumulate in

 

dead or physiologically inactive tissues sch

as heartwood, cork and old leaves. They could

 

also be found in many unripe fruits.

 

Tannins are of economic interest because of

their ability to unite with certain types of

proteins, such as gelatin in animal skins, to

lorm a strong. flexible, resistant insoluble

 

Substance known as leather. Tannins could

 

be yellowish or brownish in colour. This gives

 

cathers its brown colour. Because of this

characteristic.

 

tannin-containing materials

 

fa ngreat demand. In the absence of this

 

n treatment, skins become hard. brittle

and leather objects.

Pie

They also aid in the protection of the plant.

Tannins are also used in the manufacture of

certain types of inks. Tannin forms a blue-

black or green-black substance when it reacts

with soluble iron compounds.

 

Their astringent nature makes them useful in

medicine.

Tanning materials are also utilized in oil

drilling to reduce the viscosity of the drill

without reducing the specific gravity.

 

Examples of tannins include:

Wattle: Acacia spp. It is used in tanning sole

leathers. It belongs to the family Fabaceae.

 

Hemlocks: Tsuga canadense, T. heterphylla.

They belong to the family Pinaceae. nea193/

 

Tannins derived from woods

Chestnuts: Castanea dentate, C. sativa

 

Quebracho: Schinopsis spp.

 

Tannins derived from leaves

 

White cutch: Uncaria gambir. It belongs tob

the family Rubiaceae. It is used in tanning

leathers. It is used as a dyestuff, masticatory,

and medicines.

Tannin derived from acorn cup

Valonia

 

Quercus macrolepis:

 

Tt is a tree of the family Fagaceae.It is found in

the Mediteranean region.The Valonia Oak is a

 

majestic, semi-evergreen tree which is being

threatened with extinction because of human

 

activities over many centuries.

 

lt is extremely photophilic, a characteristic

which makes it to grow very sparsely and

to from a sparse crown so that no branch overshadows another. Because of this, the

ground

shadow and protected from drought. As a

result of this the development period of the

vegetation which grows in the area around the

tree is prolonged by 4 to 6 weeks.

 

surrounding the tree is in light

 

Palmetto

It is native to the southeastern United States,

Cuba, and the Bahamas. It is a distinct fan

palm (Arecaceae tribe Corypheae), with a bare

petiole which extends as a center spine or

midrib, (costa) half to two- third the length

into a rounded.

numerous leaflets.

The flowers are yellowish-white, produced in

large compound panicles up to 8.2inches long

and 20 inches across, extending out Deyotd

the leaves. The fruit is a black drupe about

inches long containing a single seed. It is

Extremely salt-tolerant and is often Seen

growing near the Atlantic Ocean coast.

Mangrove: rhizophora mangle

It belongs to family rhizophoraceae

Uses of Mangrove

The bark, leaf shoots and leaves of the trees supply tannin used for dyes, leather preservatives and furniture stains

 

 

 

 

Updated: February 10, 2020 — 8:18 pm

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