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Metastable solution, 30 μg/mL PTX in 16% ethanol aqueous solution, was used to prepare nanocrystals. Sonication in nucleation stage lasted 15 min. The obtained nanosuspensions were filtered and redispersed in 5 mL pure water. SEM photographs (A)–(D) and size distribution (a)–(d) of PTX nanocrystals in redispersing process under sonication for (A) and (a) 1 min, (B) and (b) 5 min, (C) and (c) 10 min, and (D) and (d) 15 min.
