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. Author manuscript; available in PMC: 2011 Oct 1.
Published in final edited form as: J Chromatogr B Analyt Technol Biomed Life Sci. 2010 Feb 1;878(27):2635–2642. doi: 10.1016/j.jchromb.2010.01.012

Figure 2.

Figure 2

Figure 2

Gas chromatograms (m/z 200-600) of (A) a filtered solution containing HDA, monoacetyl-HDA, and diacetyl-HDA synthesized with 0.9:1 molar ratio (acetic anhydride to HDA) in ethyl acetate using 2 h reaction time and derivatization with HFBA and (B) derivatized extract from control urine spiked with the 0.9:1 molar ratio mixture and subjected to base hydrolysis.