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Pharmacognosy > Tannins > Flashcards

Tannins Flashcards

1
Q

Properties of tannins?

A

Amorphous (no specific shape)

Possess an acid reaction, puckering taste

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2
Q

Properties of tannins

A

Soluble in water

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3
Q

Ppty of tannins

A

Precipitate sol of gelatin albumin and alkaloids

Ppt by sals of copper lead and tin

Readily absorbs oxygen

Form dark blue of greenish black w/ ferric salts

Deep red with KFCN

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4
Q

Ppty of tannins

A

Yield simple polyhydric phenols

Gallic acid —> pyrogallol (turns blue by Fe+)

Protocatechuic acid —> cathechl (green by fe)

Ellagic acid —> pyragallol nuclei ( green by fe+)

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5
Q

Importance

A

Employs energy

Source of fruit acids

Antiseptic or prevent damage by insect or fungi

Serves as protectant to the plant

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6
Q

Importance to man

A

Astringent to GIT and skin abrasions
Tx of burns
Preservative on leather
Deeply colored compound
Reagents for detection og gelatin, al, and proteins
Inactivate alkaloid, for alkaloid poisoning

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7
Q

Condensed tannins

A

Yields catechol when heated

Yield insoluble red phlobaphenes when boiled hcl

Form ppt with bromine

Form green color

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8
Q

Hamamelis

A

Witch Hazel Leaves,

Hamamelis virginiana

Gallic acid, bitter, hamamelitanin

Hemostatic, astringent

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9
Q

Krameria

A

Rhatany

Krameria triandra

Krameric acid, tannin 8-10%

Astringent

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10
Q

Chestnut

A

Castanea dentate

Tannic acid, mucilage

Astringent

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11
Q

Kino

A

Indian kino tree
Pterocarpus marsupium
Kinnota nic acid. Kinoin, kino-red
Astringent

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12
Q

Gambir

A

Pale catechu
Uncaria gambir
Catechutannic acid
Astringent

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13
Q

Ceanothus

A

NJ Tea, red root
Ceanothus americans
Phlobapenes(redbrown insoluble ppt)
Hemostatic

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14
Q

Oak Bark

A

English / common oak
Quercus robur
Phlobatannins, ellagintannins, gallic acid
Astringent tanning dyeing

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15
Q

Turkish galls

A 
Turkey galls, galla
Dyer's oak.
Quercus infectoria
Gallotanic acid
Tanning dyeing , manufacture of ink
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16
Q

Hydrolysable Tannins!

A

Yield pyrogallol when heated
Yield gallic acid and ellagic acid, hcl
Form

17
Q

Nutgall

A

Quarous infectoria
Tannic, gallic, ellagic
Inks, tanning dyeing, alkaloidal ppt

18
Q

Rose

A

Red / french rose
Rosa gallica
Quercetrin gallic ellagic
Tonic colorant mild astringent

19
Q

Hawthorn

A

Haw may bush /flower
Crataegus monogyna
Procyanidin
Regulate bp, mild cardiotonic, sedative, MI

20
Q

Sangre de gato

A

dragon’s blood, sangre degrase
Proton neckheri
Proanthocyanidin, rapsin
Anti-ox, anti tumor

21
Q

Myrobalan

A

Hala; black talisay
Terminalia cheuula, t. Catappa
Tannins, anthraquinone glycoside
Anti diarrheal, astringent

22
Q

Alchemillia

A

Lady’s mantle
Alchemilla mollis
Tannic acid, gallic, ellagic acid

Topical astringent, regulates mens cycle, reduce cramps

23
Q

Who discovered tannins? And when?

A

Seguin. 1796

Pharmacognosy (1 decks)

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