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. Author manuscript; available in PMC: 2014 Feb 23.

Published in final edited form as: J Pharm Biomed Anal. 2012 Nov 15;74:291–297. doi: 10.1016/j.jpba.2012.10.033

Fig. 6 — Experiments F and G. Mean ± SD (n = 6). Comparison of heroin ( ), 6-MAM ( ), and morphine ( ) stability in plasma post-collection from heroin dosed rats. Samples were stored either as pre-extracted plasma diluted with 10 mM formate buffer containing NaF (a) or in the post-extraction pellet state (b) at −80°C for up to one week.

Inline graphic — Experiments F and G. Mean ± SD (n = 6). Comparison of heroin ( ), 6-MAM ( ), and morphine ( ) stability in plasma post-collection from heroin dosed rats. Samples were stored either as pre-extracted plasma diluted with 10 mM formate buffer containing NaF (a) or in the post-extraction pellet state (b) at −80°C for up to one week.