A polysaturated fatty acid has 2 or more locations in the carbon chain that are not saturated with hydrogen .
Polyunsaturated fatty acids are fatty acids that contain more than one double bond in their backbone .this class includes many important compounds ,such as essential fatty acids and those that give drying oils their characteristic property .
Polyunsaturated fatty acids can be classified in various groups by their chemical structures :
1) methylene-interrupted polyenes
2) conjugated fatty acids
based on the length of their carbon backbone ,they are sometimes classified in two groups :
1) short chain polyunsaturated fatty acids : with 18 carbon atoms .
2) long - chain polyunsaturated fatty acids : with 20 or more carbon atoms .
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