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• W1991236483 abstract "This paper introduces a chitosan microneedle patch for efficient and sustained transdermal delivery of hydrophilic macromolecules. Chitosan microneedles have sufficient mechanical strength to be inserted in vitro into porcine skin at approximately 250 μm in depth and in vivo into rat skin at approximately 200 μm in depth. Bovine serum albumin (BSA, MW = 66.5 kDa) was used as a model protein to explore the potential use of chitosan microneedles as a transdermal delivery device for protein drugs. In vitro drug release showed that chitosan microneedles can provide a sustained release of BSA for at least 8 days (approximately 95% of drugs released in 8 days). When the Alexa Fluor 488-labeled BSA (Alexa 488-BSA)-loaded microneedles were applied to the rat skin in vivo, confocal microscopic images showed that BSA can gradually diffuse from the puncture sites to the dermal layer and the fluorescence of Alexa 488-BSA can be observed at the depth of 300 μm. In addition, encapsulation of BSA within the microneedle matrix did not alter the secondary structure of BSA, indicating that the gentle nature of the fabrication process allowed for encapsulation of fragile biomolecules. These results suggested that the developed chitosan microneedles may serve as a promising device for transdermal delivery of macromolecules in a sustained manner." @default.
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• W1991236483 date "2012-11-14" @default.
• W1991236483 modified "2023-10-14" @default.
• W1991236483 title "Chitosan Microneedle Patches for Sustained Transdermal Delivery of Macromolecules" @default.
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• W1991236483 doi "https://doi.org/10.1021/bm301293d" @default.
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