A hydrophobic photodynamic therapy drug, hypocrellin B (HB), was accumulated in water-solubilized natural polyelectrolyte microcapsules. The HB can be effectively encapsulated, delivered and subsequently taken up by cancer cells. These intracellular HB-loaded microcapsules show biocompatibility under darkness and high cytotoxicity after irradiation which provides the possibility of controlled delivery and release of drugs.
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Wang et al. (2007) studied this question.
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