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Scanning electron micrographs showing the surface appearance of Eudragit matrices produced by the compaction of lyophilised powders prepared from a dispersion of Eudragit powder in: (A) phosphate-buffered saline (PBS)/Tween® 80, (B) plus mannitol or (C) trehalose; (D) or produced by the compaction of "as received" Eudragit L100 powder alone. The size-bar represents 10 µm.
