Dual drug delivery system based on pH-sensitive silk fibroin/alginate nanoparticles entrapped in PNIPAM hydrogel for treating severe infected burn wound

2020 ◽  
Vol 13 (1) ◽  
pp. 015005
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Sheyda Damoogh ◽  
Rui L Reis ◽  
Subhas C Kundu ◽  
Fatemeh Mottaghitalab ◽  
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Mohd Hezmee Mohd Noor ◽  
Loqman Mohamad Yusof ◽  
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Yeap Swee Keong ◽  
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2017 ◽  
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Sávia C. Lopes ◽  
Danyelle M. Townsend ◽  
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pp. 170-181 ◽  
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Stimuli-responsive hydrogels have been widely researched as carrier systems, due to their excellent biocompatibility and responsiveness to external physiologic environment factors. In this study, dextran-based nanogel with covalently conjugated doxorubicin (DOX) was developed via Schiff base formation using the inverse microemulsion technique. Since the Schiff base linkages are acid-sensitive, drug release profile of the DOX-loaded nanogel would be pH-dependent. In vitro drug release studies confirmed that DOX was released much faster under acidic condition (pH 2.0, 5.0) than that at pH 7.4. Approximately 66, 28, and 9% of drug was released in 72 h at pH 2.0, 5.0, and 7.4, respectively. Cell uptake by the human breast cancer cell (MCF-7) demonstrated that the DOX-loaded dextran nanogel could be internalized through endocytosis and distributed in endocytic compartments inside tumor cells. These results indicated that the Schiff base-containing nanogel can serve as a pH-sensitive drug delivery system. And the presence of multiple aldehyde groups on the nanogel are available for further conjugations of targeting ligands or imaging probes.


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