Chemistry Project to Study Adulteration in Food 2012
To Study Adulteration in Food
The Objective of this project is to study some of the
common food adulterants present in different food stuffs
Adulteration in food is normally present in its most crude form;
prohibited substances are either added or partly or wholly substituted.
Normally the contamination/adulteration in food is done either for financial
gain or due to carelessness and lack in proper hygienic condition of processing,
storing, transportation and marketing. This ultimately results that the
consumer is either cheated or often become victim of diseases. Such types of
adulteration are quite common in developing countries or backward countries.
It is equally important for the consumer to know the common adulterants and
their effect on health.
To detect the presence of adulterants in fat, oil and butter.
Test-tube, acetic anhydride, conc. H2SO4, acetic acid, conc. HNO3.
Common adulterants present in ghee and oil are paraffin wax, hydrocarbons, dyes and argemone oil. These are detected as follows :
(i) Adulteration of paraffin wax and hydrocarbon in vegetable ghee
Heat small amount of vegetable ghee with acetic anhydride. Droplets of oil floating on the surface of unused acetic anhydride indicates the presence of wax or hydrocarbons.
(ii) Adulteration of dyes in fat
Heat 1mL of fat with a mixture of 1mL of conc. sulphuric acid and 4mL of acetic acid. Appearance of pink or red colour indicates presence of dye in fat.
(iii) Adulteration of argemone oil in edible oils
To small amount of oil in a test-tube, add few drops of conc. HNO3 and shake. Appearance of red colour in the acid layer indicates presence of argemone oil.
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