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. Author manuscript; available in PMC: 2014 Dec 15.
Published in final edited form as: Anal Biochem. 2013 Sep 11;443(2):222–231. doi: 10.1016/j.ab.2013.09.001

Fig. 7.

Fig. 7

MS/MS spectra of kynurenine standard (top) and the fraction collected under peak related to KYN during HPLC analysis in the brain sample presented in Figs. 5 and 6 (bottom). The fragmentation pattern of kynurenine is in excellent agreement with a previous report [25]. The presence of ions related to kynurenine and its fragments in the spectrum recorded for brain sample indicates appropriate assignment of peak related KYN in the HPLC chromatogram.