Colloidal System is
the heterogenous biphasic system
dispersed phase ranges within 1-10
angstrom to few micrometres in
differs from other heterogenous and
homogenous solutions in terms of the size
of dispersed phase.
Colloids play an important role in
pharmacy,in our daily life and in
A few of the important applications of
colloids are listed below.
Colloidal system are used as therapeutic
agents in different areas.
Colloidal medicines being finely divided,
are more effective and are easily absorbed
in our system.
Penicillin and streptomycin .
Argyrol and protargyrol
Absorbed efficiently in colloidal forms.
In treatment of cancer.
Diagnostic agent for paresis.
In treatment of syphilis.
Increase solubility,stability and taste of
compounds,in lyophillic colloids.
STABILITY OF DRUGS:
and prevent flocculation .
gelatin coating over tablets
Both enhance due to huge
TARGETED DRUG DELIVERY:
Vessicles of phospholipids.
As a drug carrier to promote controlled
release of drug in body.
Taken up by the liver and spleen.
APPLICATIONS IN FOOD
Many of our foods
are colloidal in
Milk is an emulsion
of butterfat in water
protected by a
gelatin deserts, fruit
Ice cream & Bread.
All paints are colloidal
dispersions of solid
pigments in a liquid
paints also contain longchain polymers.
At rest, the chains of
molecules are coiled.
stress is applied with a paint
brush, the coiled molecules
This renders the paint ‘nondrip’.
Colloidal particles of the dirt, mud etc.
carry electric charge.
the colloidal particles are coagulated when
sewage water is passed through the plates
kept at a high potential.
the suspended matter gets removed.
Cleansing action of
Soap solution is
colloidal in nature.
It removes the dirt
particles either by
adsorption or by
A colloidal solution
of silver bromide in
gelatin is applied on
glass plates or
celluloid films to
form sensitive plates
Clarification of Municipal water:
The municipal water contains colloidal
Alum which yield ions, Al3+ is added to
water to coagulate the negatively charged
Al3+ + 3H2O ---- Al(OH)3 + 3H+
Al(OH)3 + 4H2O + H+ ----- Al(OH)3(H2O)4
Artificial Kidney machine:
The human kidneys purify the blood by
dialysis through natural membranes.
The toxic waste products such as urea and
uric acid pass through the membranes
colloidal-sized particles of blood proteins
(haemoglobin) are retained
of the scattering
of light by the sol
particles is called
A knowledge of colloid chemistry is
essential to understand some of the various
natural phenomena around us.
Colloids make up some of our modern
Dialysis,life saving treatment.