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SEM pictures of the freeze-dried powders: (B) unmodified API; (C) dimethyl sulfoxide:tert-butanol (DMSO:TBA), 90:10 (low TBA); (D) 75:25, (E) 50:50 (medium); (F) 25:75; and (G) 10:90 (high TBA). Left: 200 µm scale bar/right: 10 µm scale bar (3000× magnification). Reprinted (adapted) with permission from Ref. 38. Copyright © 2012 Elsevier.
