Synonym : Cotton , Wool , purified cotton
absorbent and
surgical cotton .
Biological Source :
Scientific Name :
Family : Malvaceae
Geographical Distribution : India ,
Organoleptic Characters :
i)
Colour : White and it consist of thin soft filamentous hair .
ii)
Odour : None
iii)
Taste : None
iv) Length : 2 to 4 cm
v) Diameter : 25 to 40 micron
Extra feature – Hairs
are unicellular , absorbing , sinks in water where as non-absorbing cotton
flats on water ( due to presence of fatty material )
.
Chemical constituents – Absorbing cotton contains pure form of
cellulose . Cellulose is
made-up
of gluco - receview united by 1,4 β
glucosidic link .
Chemical Test
|
Reagent
|
Observation
|
Inferance
|
|
Ignition
|
Rapid burning
gives no odour , no heat
|
Cellulose present
|
|
KOH ( 5% )
|
Insoluble
|
Cellulose present
|
|
Concentrated Hcl
|
Insoluble
|
Cellulose present
|
|
80% concentrated H2So4
|
Soluble
|
Cellulose present
|
|
60% concentrated H2So4
|
Insoluble
|
Cellulose present
|
|
Chloro ZnI
|
Blue colour observed
|
Cellulose present
|
|
Molish reagent
|
Violet colour observed
|
Cellulose present
|
Uses -
i)
It is used as surgical dressing , it gives mechanical
support to absorb blood , mucous , pus
and protect the wound from bacterial infection
ii)
It is used in the preparation of cellulose derivatives
like methyl cellulose , C.M.L .
iii)
It is used as filtering media , absorbent gauge .
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