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. Author manuscript; available in PMC: 2014 Jun 18.
Published in final edited form as: Anal Chem. 2013 Jun 5;85(12):5632–5636. doi: 10.1021/ac401056q

Figure 1.

Figure 1

a) A capillary sampler (0.4 mm I.D., about 8 mm long) prepared by filling it with an internal standard (IS) solution through capillary action and drying in air to form an IS coating on its inner surface. b) Use of a capillary sampler with a pipette tip as holder to take the blood sample and to deposit it onto a paper substrate to prepare a dried blood spot containing IS. c) Array of dried blood spots prepared on chromatography paper using capillary samplers. Paper triangles were cut out along the dash lines and used for paper spray ionization. Relative standard deviation (RSD) of the area of the blood spots: was about 8 %, n = 8.