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Scanning Electron Microscopy photographs of pure andrographolide (AG), carrier materials (PEG4000, PEG8000, SM1, and SM6), physical mixtures (PM), and solid dispersions (SD): (a) AG–PEG4000–S–SD, (b) AG–SM1–S–SD, (c) AG–SM6–S–SD, (d) AG–PEG4000–V–SD, (e) AG–SM1–V–SD, (f)AG–SM6–V–SD, (g) AG–PEG4000–PM, (h) AG–SM1–PM, (i) AG–SM6–PM, (j) PEG4000, (k) SM1, (l) SM6, (m) AG–PEG8000–PM, (n) PEG8000, (o) AG.
