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Representative (a) Fourier Transform Infrared (FTIR) and (b) Low-Frequency Raman (LFR) spectra of the different particles. From top to bottom: Crystalline kanamycin, kanamycin only formulation (KO), spray-dried tryptophan (Tryptophan_SD), a physical mixture (1:1) of amorphous kanamycin and amorphous tryptophan (PM), kanamycin-tryptophan formulation (KT), kanamycin-valine formulation (KV), kanamycin-methionine formulation (KM), and kanamycin-phenylalanine formulation (KP).
