Abstract
For poorly water-soluble drugs, the dissolution time in the gastrointestinal contents may be longer than the transit time to the intended absorptive sites. Therefore, dissolution of drugs is quite often the rate-limiting step for drug absorption. This poses a major challenge for effective oral delivery of poorly soluble drugs. Recently, polymeric micelles composed of amphiphilic block or grafted copolymers have shown much advantage in drug delivery systems and attracted lots of interest due to its solubilization, low toxicity, long circulation, and passive targeting against tumor. Generally, amphiphilic copolymers can self-assemble to form nanosized spherical structures (10–200 nm) consisting of hydrophobic inner core and hydrophilic outer shell in aqueous medium. The hydrophobic cores can be used to entrap hydrophobic drugs, and release them in a controlled manner at a later stage, while the hydrophilic shell provides stabilization for the micelles with no need of additional stabilizers. Furthermore, the hydrophilic shell can be modified to have desirable properties, such as evading scavenging by the mononuclear phagocyte system (MPS) or obtaining active targeting. Natural polysaccharides are nontoxic, biodegradable, and easily amenable to chemical modifications to have better materials for drug delivery applications. In most of cases, a number of synthetic polymers have been investigated for their drug solubilizing capacity, loading efficiency, improved bioavailability, and targeting efficiency. However, the reports on natural polymer-based amphiphilic copolymer are limited in the literature. The purpose of this chapter is to illustrate recent advancements in the field of polymeric micelles emphasizing tailored bio-polysaccharide based micellar carrier systems.
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Maiti, S. (2015). Tailored Bio-Polysaccharide Nanomicelles for Targeted Drug Delivery. In: Lungu, M., Neculae, A., Bunoiu, M., Biris, C. (eds) Nanoparticles' Promises and Risks. Springer, Cham. https://doi.org/10.1007/978-3-319-11728-7_16
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