Phased bond release should be established with specific reclamation criteria for each phase of release.
During the diffusional phase of release, water intrusion leads to polymer hydration and slow movement of the encapsulated drug to the outer sink.
These results demonstrate that the second phase of release from F4, F5, and F6 is also controlled by a typical Fickian diffusion mechanism.
The first phase of release occurs immediately after the microsphere encounters a liquid medium (i.e., in vitro buffer or in vivo fluids).
Here, the whole process of single-curvature CLB, including the phase of release and the consequent contact problem with the constraining mould, is analyzed using sandwich beam theory.
Pretreatment with 6-hydroxydopamine, a neurotoxin selective for sympathetic postganglionic nerve terminals, had no effect on release evoked by 1.5% formalin, but significantly reduced adenosine release during the late phase of release induced by 5% formalin.
Pretreatment with capsaicin, a neurotoxin selective for unmyelinated small diameter primary afferent nerves, markedly reduced the adenosine released by 1.5% formalin and the early phase of release by 5% formalin.
In addition, Sal appeared to be released from Sal-loaded NPs in a biphasic way, that is, the release profile can be roughly divided into two phases: the first phase of release was complete within 12 h, considered as an initial burst, and the second phase showing sustained release for up to 96 h took place after this initial effect in which Sal was released.
Slices were stored at −20°C and washed at room temperature for 48 hours in saline before implantation to avoid the initial, fast phase of release that occurs before a slow, sustained release phase lasting at least 12 days [33], [34].
