Abstract
The combination of hydrogels and lipid carriers has been widely used in the encapsulation of oil-soluble active ingredients. The objective of the present work was to understand the release mechanism of lipid nanoparticles (LNP) immobilized within alginate hydrogel beads. To evaluate the amount of LNP released from alginate beads, a simple method derived from dynamic light scattering was established and applied in the dissolution study effectively. The presence of LNP-mediated release was confirmed in the dissolution study. The dissolution study in simulated gastric fluids, involving diffusion-controlled release model, indicated that the LNP-mediated release was susceptible to the size of LNP and alginate concentration. The release study in simulated intestinal fluids, involving swelling-controlled release model, showed that the alginate concentration had a decisive effect on the release. This study will be helpful for the design of a new delivery system, which combines hydrogels and lipid carriers.
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