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. Author manuscript; available in PMC: 2010 Oct 1.

Published in final edited form as: Prostaglandins Leukot Essent Fatty Acids. 2009 Jun 30;81(4):291–301. doi: 10.1016/j.plefa.2009.05.026

Identification of NA-tyrosine in rat brain. (A) Chemical structure of NA-tyrosine. (B) The mass spectrum of the material in rat brain extract (top plot) and synthetic NA-tyrosine (bottom plot) via QqTOF LC/MS/MS were virtually identical. The prominent parent ion at m/z 446.3 [MH]⁻ of NA-tyrosine was observed for the material in the brain extract and synthetic NA-tyrosine. (C) Multiple-reaction monitoring on a triple-quadrupole mass spectrometer revealed co-eluting peaks with molecular/fragment ions at m/z 446.3/179.9 from synthetic NA-tyrosine and the material in rat brain extract.

Identification of NA-tyrosine in rat brain. (A) Chemical structure of NA-tyrosine. (B) The mass spectrum of the material in rat brain extract (top plot) and synthetic NA-tyrosine (bottom plot) via QqTOF LC/MS/MS were virtually identical. The prominent parent ion at m/z 446.3 [MH]⁻ of NA-tyrosine was observed for the material in the brain extract and synthetic NA-tyrosine. (C) Multiple-reaction monitoring on a triple-quadrupole mass spectrometer revealed co-eluting peaks with molecular/fragment ions at m/z 446.3/179.9 from synthetic NA-tyrosine and the material in rat brain extract.