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Raman spectra of (a) Raw Trehalose, SD Trehalose, Raw Ang (1—7), SD Ang (1—7), and co-SD Ang (1—7): Trehalose (25: 75). (b) Raman spectra for co-SD Ang (1—7):Trehalose (25:75) at three spots with the powder’s microscopic images in each spot. Scale bar: 50 μm.
