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. Author manuscript; available in PMC: 2014 Oct 1.
Published in final edited form as: Chromatographia. 2013 Apr 5;76(19-20):1339–1346. doi: 10.1007/s10337-013-2458-y

Fig. 3.

Fig. 3

Mass spectra for analysis of dried blood spots using silica-coated paper substrates with different solvents, 20 μL methanol (E) and methanol/acetone (50:50, v:v) (F). Dried blood spots prepared with 2 μL blood containing 1 μg/mL verapamil (m/z 455).