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Mass spectra of 5 pmol each of dextran and ACTH fragment 18–39 obtained from various samples, including (a) dried-droplet, (b) thin-layer, and (c) trilayer samples. The numbers indicate the degrees of polymerization (n) of sodiated dextran. Reproduced from Chieh-Lin Wu; Chia-Chen Wang; Yin-Hung Lai; Hsun Lee; Jia-Der Lin; Yuan Tseh Lee; Yi-Sheng Wang; Anal. Chem. 2013, 85, 3836–3841.
