Engineering and Development of Chitosan-Based Nanocoatings for Ocular Contact Lenses.
J Pharm Sci
; 108(4): 1540-1551, 2019 04.
Article
in En
| MEDLINE
| ID: mdl-30513319
ABSTRACT
This article reports on electrohydrodynamic atomization to engineer on-demand novel coatings for ocular contact lenses. A formulation approach was adopted to modulate the release of timolol maleate (TM) using chitosan and borneol. Polymers polyvinylpyrrolidone and poly (N-isopropylacrylamide) were utilized to encapsulate TM and were electrically atomized to produce optimized, stationary contact lens coatings. The particle and fiber diameter, thermal stability, material compatibility of the formed coatings, their in vitro release-modulating effect, and ocular tolerability were investigated. Results demonstrated highly stable nanomatrices with advantageous morphology and size. All formulations yielded coatings with high TM encapsulation (>88%) and excellent ocular biocompatibility. Coatings yielded biphasic and triphasic release, depending on composition. Kinetic modeling revealed a noticeable effect of chitosan; the higher the concentration, the more the release of TM because of chitosan swelling, with the mechanism changing from Fickian diffusion (1% w/v; n = 0.5) to non-Fickian (5% w/v, 0.45 Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Timolol
/
Glaucoma
/
Contact Lenses
/
Drug Compounding
/
Antihypertensive Agents
Limits:
Animals
/
Humans
Language:
En
Journal:
J Pharm Sci
Year:
2019
Document type:
Article
Affiliation country: