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. Author manuscript; available in PMC: 2018 Jun 16.
Published in final edited form as: Anal Methods. 2017 Jun 16;9:3876–3883. doi: 10.1039/C7AY00532F

Figure 2.

Figure 2

SPE-MS/MS chromatogram of fentanyl analogs eluted from 5 μL dried blood spots. Extracted ion chromatograms of (A) all analytes at a concentration of 7.5 ng/mL in pooled whole blood and of (B) sufentanil at a concentration of 1.0 ng/mL.