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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 4.

Figure 4

Figure 4

GC mass spectra (m/z 200 – 600) of monoacetyl-HDA (A) and diacetyl-HDA (B) in derivatized extract from untreated control urine sample spiked with 0.9:1 molar ratio (acetic anhydride to HDA or HpDA) mixtures.