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Pharmacognosy

Cotton consists of hairs from cotton plants and is used for filtering, in surgery, and as an insulating material. It is mostly made of cellulose and is identified through turning purple-blue when treated with iodine and sulfuric acid or dissolving completely in ammonical copper oxide solution.

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799 views1 page

Pharmacognosy

Cotton consists of hairs from cotton plants and is used for filtering, in surgery, and as an insulating material. It is mostly made of cellulose and is identified through turning purple-blue when treated with iodine and sulfuric acid or dissolving completely in ammonical copper oxide solution.

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parthdd04
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COTTON

 Synonym:-Raw cotton, Purified cotton,


Surgical cotton.
 Biological Source:- Cotton consist of the
epidermal trichomes or hairs of the seeds of the
cultivated species of the Gossypium (Gossypium
herbaceurre, Gossypium barbadense),belonging to
family Malvaceae. Purified cotton or absorbent
cotton consist of the trichomes as mentioned
above, but freed from fatty matter and adhering
impurities. It is also bleached and sterilized.
 Morphological Characteristics :-
 Colour:White (due to bleaching )
Fig. Cotton
 Odour: Odourless
 Taste: Tasteless
 Size and Shape : Cotton fibres are 2.5 -4.5 cm. in length and 25-35 micron in
diameter .
 Medicinal Uses:
1.Cotton is used as filtering medium .
2.Cotton is also used in surgical .
3.It is also used as an insulating material.
.
 Chemical constituents:- Raw cotton contains about 90% of cellulose, 7-8%
of moisture, wax,fat and remains of protoplasm. Purified cotton or absorbent cotton is
entirely cellulose, with 6-7% of moisture .
 Identification Test :-
1) Soak cotton fibres in iodine water and dry. Add few ml. of 80% sulphuric acid
trichomes assume purplish-blue or bluish-green colour.
2) Ammonical copper oxide solution (cuoxam reagents) dissolves completely with
uniform swelling .
3) Cotton is insoluble in dilute sodium hydroxide solution and hydrochloric acid
(distinction from silk).It is soluble in 66% of sulphuric acid.
 Reference:- Name: -Prajapt Poonam Hemraj
Roll no.:- 048
 Dr. Kokate C. K., Purohit A.P., Gokhale S. B., ”A book PRN:- 2252861823049
 of Pharmacogonsy”; Nirali Prakashan, 56th edition, Sep
2019, pg no. 8.6-8.7

 Guided by:- Prof. Mayur Gangurde Sir

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