The resulting solutions were filtered through 0.45 um pore size filter to remove undissolved excipients and finally diluted to the desired concentration for analysis of drug content.
Cloudiness in water is caused by material floating in it; undissolved particles may actually provide some protection for harmful pathogens against disinfectants.
Additionally, in accordance with Boyle's law, the volume of an otherwise fixed amount of undissolved gas increases, again, as its absolute pressure is reduced.
I agree with him that I have seen entire, undissolved misoprostol tablets expelled from the rectum many hours after they were administered for the treatment of PPH.
Tracking lead levels in water pipes over nearly two years, researchers discovered three times as much dissolved lead and six times as much undissolved lead in summer than in winter.