Journal
BIOLOGICAL & PHARMACEUTICAL BULLETIN
Volume 28, Issue 2, Pages 394-397Publisher
PHARMACEUTICAL SOC JAPAN
DOI: 10.1248/bpb.28.394
Keywords
alginate bead; drug; delivery system; controlled release; coating; starch
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Utilizing starch-containing alginate beads, a novel drug delivery system (DDS) was developed. With the starch inside, the composite bead could be dried in its original bead shape and handled in the dried state. By employing alginate multi-coating strategy on the starch-alginate beads, detained or controlled release was efficiently achieved and successfully demonstrated for a model peptide drug, L-phenylaianine. The initial latent time and release rate of the drug inside the beads were able to be controlled simply by varying the number of multicoatings. While the latent time for the initial release was negligible for non-coated starch-alginate beads, the latent times of beads coated one, two, and four times increased to 15, 30, and 70 min, respectively. Furthermore, the alginate component of the composite beads could adsorb and remove heavy metals such as lead from the body. These multifunctional beads combined with the novel coating process will greatly benefit alginate gel-based DDS.
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