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ATR-FTIR spectroscopic images showing the precipitation of crystalline ibuprofen crystals upon contact and mixing of a sodium ibuprofen solution (2 mg/ml) with a pH 1 solution. The spatial distribution of sodium ibuprofen (top row), crystalline ibuprofen (middle row), and aqueous solution (bottom row) are presented. The size of each image is ∼11.5 × 8 mm2.
