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Scanning electron microphotographs of solid dispersions and physical mixtures with PVP K30 as carrier (1:6 w/w). (A) Tanshinone IIA-PVP K30 solid dispersion, (B) tanshinone IIA-PVP K30 physical mixture, (C) cryptotanshinone-PVP K30 solid dispersion, (D) cryptotanshinone-PVP K30 physical mixture, (E) total tanshinones-PVP K30 solid dispersion, (F) total tanshinones-PVP K30 physical mixture.
