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. Author manuscript; available in PMC: 2011 Apr 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2010 Jan 25;21(4):657–669. doi: 10.1016/j.jasms.2010.01.007

Scheme 3.

Scheme 3

The fragmenation pathways proposed for location of the double bonds along the fatty acid chain of 20:4/20:4/20:4-TAG from MS3 on the [M + Li − R3CO2H] ions (A), and from MS4 on the [M + Li − R3CO2H − R2”CH=CHCO2H] ions.