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. Author manuscript; available in PMC: 2013 Nov 1.
Published in final edited form as: Anal Biochem. 2012 Jul 31;430(1):4–15. doi: 10.1016/j.ab.2012.07.022

Fig. 4.

Fig. 4

(A) Linear relationship between the peak area ratio (PAR) of AECK-DD to 13C2-AECK-DD after derivatization of the indicated amounts of AECK-DD with the fixed nominal amount of 5 nmol 13C2-AECK-DD and GC-MS analysis. (B) Linear relationship between the peak area ratio (PAR) of AECK-DD to 13C2-AECK-DD after derivatization of the indicated amounts of AECK-DD with the fixed corrected amount of 0.5 nmol 13C2-AECK-DD and GC-MS/MS analysis. Data are presented as mean ± SD, n = 4 (two sets of determinations each carried out in duplicate).