Applications of colloids in food and medicine
Answers
Explanation:
Food and medicines: Colloids have great application in food industries and food stuffs. Many of the food materials which we eat are of colloidal nature. Milk and also many milk products like chees, cream butter etc. are colloids.
In more accurate way, milk is an emulsion (liquid in liquid colloidal system). In milk, butter and fat are dispersed in water. Bread is colloidal system in which air is dispersed in baked dough.
Colloids also have applications in the form of medicines. Colloidal medicines are competitively more effective as they are easily absorbed by the body. That is way many medicines are emulsion.
Some major antibiotics like penicillin and streptomycin are injected in the body in the form of colloidal sol so that they would be absorbed by the body easily.
Answer:
(1) Electrical precipitation of smoke : Smoke is an exerosol or a colloidal solution of solid particles of carbon, dust, arsenic or sulphur compounds, etc. When the smoke is passed through a chimney, provided inside with charged plates, the charge on colloidal particles is neutralise and hence get precipitated on the floor of then chamber. This process is called cottrell process.
(2) Purification of water : Colloidal particles in an impure water are removed by coagulating them by addition of alum. This gives potable water.
(3) Medicines : Colloidal medicines are more effective due to large surface area to volume ratio of colloidal particles and they can be easily assimilated by body. Some of the medicines are argyrol which is a silver sol used as an eye lotion, an emulsion of milk of magnesia is used in stomach disorders.
(4) Rubber industry : Rubber is obtained by coagulation of latex.
(5) Cleansing action : The cleansing action of soaps and detergents is due to their colloidal properties.
(6) Industrial goods : A large number of industrial products like photographic plates, films, paints, rubber, graphite products, etc. are colloid.