(A) Size and LC values. (B–E) SEM images of PLGA NPs formulated with Ac (P2, B), Ac:THF (P10, C), Ac:EtOAc (P11, D), as well as ACN (P12, E). LC, loading capacities; NPs, nanoparticles; Ac, acetone; THF, tetrahydrofuran; EtOAc, ethyl acetate; ACN, acetonitrile.