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Stability studies (XRPD diffractograms of spray-dried samples) of indomethacin–arginine (IND–ARG), IND–histidine (IND–HIS) and IND–lysine (IND–LYS) mixtures after eight months of storage. Organic solvent denoted in percentage (%) is acetone (AC) in (a,c,e); and ethanol (EtOH) in (b,d,f). (c,e,f) include diffractograms of SD IND–HIS with 30% acetone, SD IND–LYS with 70% acetone, and SD IND–LYS with 20% ethanol, respectively. These samples were co-amorphous until storage month seven.
