Question

1) Draw the structure of a. 16:2(A1") fatty acid b. 18:5(4.11,13.15) fatty acid c. The glycerophospholipid composing above fatty acids and ethanolamine as a head-group constituent

please do a b and c

Answer 1

Polyunsaturated fatty acids' structures are elucidated by the fatty acid delta notation accurately. The notation contains the number of carbons, the number of unsaturations given first - no.of carbons:no.of double bonds with the superscript numbers on the delta symbol indicate the carbon numbers where the double bonds are positioned. A more detailed notation will also give the orientation of each double bond as cis or trans, which is absent here. But since all natural fatty acids prefer the cis-configuration for regulating the rigidity of the cell membrane, cis-PUFAs are given in the structures.

So, the the PUFA (a) is an 16 carbon fatty acid with 2 double bonds at carbons 7 and 11. PUFA (b) is an 18 carbon fatty acid with 5 double bonds in it at carbons 5, 9,11, 13 and 15. The carbons are numbered taking carbon 1 to be the carboxylate carbon.

b) он a) он

c) A glycerophospholipid is the ester of one molecule of glycerol with 2 molecules of fatty acids and 1 molecule of phosphate - the dianion of phosphoric acid. The phosphate group also houses the head group condensed to it on one of its oxygens, which in this case is ethanolamine. Using the given constraints, the structure of the possible glycerophospholipid is as follows.