In Vitro Drug Dissolution: Alternative Methods

Alternative drug dissolution methods include rotating bottle, intrinsic, peristalsis, and Franz diffusion cell methods.

The rotating bottle method involves tightly capped controlled-release beads rotated in a temperature bath. Samples are periodically decanted for residue assay and refilled with fresh medium. It is tested at various pH levels to mimic the GI tract.

The intrinsic dissolution test examines drug powder dissolution without excipients, achieved by placing the sample in a disk.

The peristalsis method uses rigid plastic tubing with a septum and stoppers. The sample placed in the apparatus is immersed in a beaker with a dissolution medium. This medium is then pumped through the dosage form to simulate GI tract conditions.

The Franz diffusion cell is a static diffusion system that characterizes topical drugs through animal or human mounts. The sample on the mounts permeates into a receptor fluid compartment. The collected sample is then analyzed at different times using methods like HPLC.