|Agriculture :: OilSeeds|
Like pulses, oil seeds are rich in protein and in addition they contain a high level of fat. Hence they are not only good sources of protein but are concentrated source of energy. They do not contain an appreciable amount of carbohydrate but contain high level of B-vitamins. Groundnuts are particularly rich in thiamine and nicotinic acid. Oil seeds produced in the country are mostly used for oil extraction.
NUTRITIVE VALUE OF OILSEEDS
In India oilseeds like groundnut, mustard, safflower, are more commonly grown for edible oil purpose.
Oil extraction: The oilseeds are cleaned, dehusked and oil is extracted by mechanical pressing, screw pressing, prepress solvent extraction and direct solvent extraction.
Protein isolate: After solvent extraction, it is treated with dilute sodium hydroxide at pH8. The proteins are separated by filtration and washing with water and then used for different purposes.
Groundnuts resemble other pulse in general nutritive value, except that they are rich in fat. Groundnuts are boiled or roasted and consumed. But the chief product is the oil, which can be used either as cooking oil or for making margarine and soap. The secondary product is the residue or cake left after the expression of the oil. It is also purified and used in supplementary mix. The major proteins of groundnut are arachin and conarachine which is lacking in lysine and methionine and its quality can be improved by either adding these amino acids or foods rich in the same.
Extraction of Sunflower Oil
* - Post Harvest Technology Centre, TNAU, Coimbatore.