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. Author manuscript; available in PMC: 2007 Apr 10.
Published in final edited form as: Pharmacol Biochem Behav. 2005 Aug 22;82(1):55–66. doi: 10.1016/j.pbb.2005.07.011

Fig. 1.

Fig. 1

Plasma levels of COC and BE determined by LC/MS/MS (black bars) and GC/MS (white bars) for postpartum dams (n =22) sacrificed 1 –3 h after an injection of cocaine (10 mg/kg, subcutaneously). Plasma COC and BE levels were averaged over the 3-h post-injection period for direct comparison. Each bar represents the mean ± S.E.M. in units of ng/mL plasma. Plasma levels of COC and BE were significantly higher when the samples were analyzed by LC/MS/MS versus when they were analyzed by GC/MS. An asterisk denotes a statistically significant difference ( p <.0001) between the two analytical methods.