Figure 3.

Glass transition temperature (T_g) of indomethacin–arginine (IND–ARG), IND–histidine (IND–HIS), and IND–lysine (IND–LYS) prepared by different preparation methods. The horizontal lines in each graph indicate the T_g measured from ball-milled (BM) samples and theoretical T_g calculated using the Gordon–Taylor equation (GT), respectively. Vertical bars represent T_g values of spray-dried co-amorphous samples where the organic solvent denoted in percentage (%) is acetone (AC) in (a,c,e); and ethanol (EtOH) in (b,d,f).