Tannins

Question 1

Comprised a large group of complex substances that are widely distributed in the plant kingdom

Answer 1

Tannins

Question 2

When tannins occur in appreciable quantity, they are usually localized in specific part of plants such as

Answer 2

leaves, fruits, barks and stems

Question 3

they are usually occur as mixtures of polyphenols that are difficult to separate because they do not crystallize

Answer 3

Tannins

Question 4

Authors prefer this name than tannins

Answer 4

tannin extracts

Question 5

Tannins are customarily divided into 2 classes based on the identity of the phenolic nuclei involved and on the way they are joined. These are __.

Answer 5

HYDROLYZABLE TANNINS

NON- HYDROLYZBLE TANNINS OR CONDENSED TANNINS

Question 6

It consist of gallic acid or related polyhydric compounds esterified with glucose

Answer 6

HYDROLYZABLE TANNINS

Question 7

Readily hydrolysable to yield the phenolic acids and the sugar

Answer 7

HYDROLYZABLE TANNINS

Question 8

these tannins contain only phenolic nuclei but frequently are linked to carbohydrates or proteins

Answer 8

NON- HYDROLYZBLE TANNINS

Question 9

non- crystallizable compounds that with water, form colloidal solutions possessing an acid reaction and a sharp “puckering” taste

Answer 9

Tannins

Question 10

Tannins form what color with ferric salts

Answer 10

dark blue or greenish black soluble compounds

Question 11

Tannins produce this color with potassium ferricyanide and ammonia

Answer 11

deep red color

Question 12

In alkaline solutions, many of tannins derivatives readily absorb __

Answer 12

oxygen

Question 13

When applied to living tissues, this action is known as an ___ and forms the basis for therapeutic application of tannins

Answer 13

astringent action

Question 14

Because of their precipitating qualities, solutions of tannins are utilized in the laboratory as reagents for the detection of __,__,__.

Answer 14

gelatins, proteins, and alkaloids

Question 15

HAMMAMELIS LEAF also known as

Answer 15

witch hazel leaves

Question 16

HAMMAMELIS LEAF is the dried leaves of

Answer 16

Hammamelis virginia Linne

Question 17

HAMMAMELIS LEAF consttituents

Answer 17

Hammamelitannin

Question 18

Second tannin that appears to be derived from gallic acid

Answer 18

Hammamelitannin

Question 19

Hammamelis leaf use

Answer 19

astringent and hemostatic properties

Question 20

HAMMAMELIS WATER also known as

Answer 20

Distilled Witch Hazel Extract

Question 21

Distilled Witch Hazel Extract Prepared by steam distillation of the recently cut and partially dried dormant twigs of

Answer 21

Hammamelis virginia

Question 22

NUTGALL is the excrescence obtained from the young twigs of

Answer 22

Cuercus infectoria

Question 23

the chief source of tannic acid is used in the tanning and in the dying industry

Answer 23

Nutgall

Question 24

Japanese and Chinese galls are formed on __.

Answer 24

Rhus chinensis

Question 25

True or false.
Tannic acid is not a single homogenous compound but is a mixture of esters of gallic acid with glucose whose exact composition varies according to its source

Answer 25

True

Question 26

occurs as amorphous powder, glistening scales, or spongy masses that are light brown to yellowish white. The odor is faint and the taste is strongly astringent

Answer 26

Tannic acid

Question 27

Tannic acid use

Answer 27

ASTRINGENT