Influence of Air Temperature and Humidity on Dehydration Equilibria and Kinetics of Theophylline
Figure 7
Scanning electron micrographs of different phases of theophylline at 3.8% RH and 20°C. (a) 0 hours (monohydrate), (b) after 12 hours (metastable anhydrate), (c) after 24 hours (stable anhydrate), and (d) after 7 days (stable anhydrate).
