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Block copolypeptide nanoparticles for the delivery of ocular therapeutics
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Stukenkemper, Timo, Dose, Anica, Caballo Gonzalez, Maria, Groenen, Alexander J.J., Hehir, Sarah, Andrés-Guerrero, Vanessa, Herrero Vanrell, Rocio and Cameron, Neil R. (2015) Block copolypeptide nanoparticles for the delivery of ocular therapeutics. Macromolecular Bioscience, 15 (1). pp. 138-145. doi:10.1002/mabi.201400471 ISSN 1616-5187.
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Official URL: http://dx.doi.org/10.1002/mabi.201400471
Abstract
Self-assembling block copolypeptides were prepared by sequential ring-opening polymerization of N-carboxyanhydride (NCA) derivatives of γ-benzyl-L-glutamic acid and ε-carbobenzyloxy-L-lysine, followed by selective deprotection of the benzyl glutamate block. The synthesized polymers had number average molecular weights close to theoretical values, and had low dispersities (ĐM = 1.15–1.28). Self-assembly of the amphiphilic block copolymers into nanoparticles was achieved using the “solvent-switch” method, whereby the polymer was dissolved in THF and water and the organic solvent removed by rotary evaporation. The type of nanostructures formed varied from spherical micelles to a mixture of spherical and worm-like micelles, depending on copolymer composition. The spherical micelles had an average diameter of 43 nm by dynamic light scattering, while the apparent diameter of the mixed phase system was around 200nm. Reproducibility of nanoparticle preparation was demonstrated to be excellent; almost identical DLS traces were obtained over three repeats. Following qualitative dye-solubilization experiments, the nanoparticles were loaded with the ocular anti-inflammatory drug dexamethasone. Loading efficiency of the nanoparticles was 90% and the cumulative drug release was 94% over 16 d, with a 20% burst release in the first 24 h.mabi201400471-gra-0001
Item Type: | Journal Article | ||||||||||
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Subjects: | R Medicine > RE Ophthalmology R Medicine > RS Pharmacy and materia medica |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||||
Library of Congress Subject Headings (LCSH): | Ophthalmic drugs, Eye -- Diseases -- Treatment, Polymerization, Nanoparticles, Polymeric drug delivery systems | ||||||||||
Journal or Publication Title: | Macromolecular Bioscience | ||||||||||
Publisher: | Wiley - V C H Verlag GmbH & Co. KGaA | ||||||||||
ISSN: | 1616-5187 | ||||||||||
Official Date: | January 2015 | ||||||||||
Dates: |
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Volume: | 15 | ||||||||||
Number: | 1 | ||||||||||
Page Range: | pp. 138-145 | ||||||||||
DOI: | 10.1002/mabi.201400471 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||
Date of first compliant deposit: | 19 January 2017 | ||||||||||
Date of first compliant Open Access: | 20 January 2017 | ||||||||||
Funder: | Seventh Framework Programme (European Commission) (FP7) | ||||||||||
Grant number: | NMP4-SL-2010-246180 |
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