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. Author manuscript; available in PMC: 2013 Jan 17.
Published in final edited form as: Anal Chem. 2011 Dec 23;84(2):931–938. doi: 10.1021/ac202058w

Figure 3.

Figure 3

Comparison of the elution behavior of verapamil with silica coated paper and chromatography papers: (i) verapamil in pure water (5 μL, 500 ng mL−1) deposited onto surface of (a) silica coated paper, (b) Grade 4 chromatography paper and (c) ET31 chromatography paper; (ii) verapamil in blood (5 μL, 500 ng mL−1) deposited onto surface of (d) silica coated paper and (e) Grade 4 chromatography paper and (f) Grade ET31 chromatography paper. Note: the experiments were performed after the paper had dried. Solvent for silica coated paper was 9:1 dichloromethane/isopropanol, chromatography paper 9:1 methanol/water. a.u. : arbitrary units.