title: Sustained in vivo release from imprinted therapeutic contact lenses.
abstract: In this paper, we demonstrate the successful in vivo extended release of a small molecular weight therapeutic, ketotifen fumarate (MW=425), from molecularly imprinted, therapeutic contact lenses. This is the first time that a steady, effective concentration of drug is maintained in the tear film from a contact lens for an extended period of time for the entire duration of lens wear. Poly(HEMA-co-AA-co-AM-co-NVP-co-PEG200DMA) soft contact lenses were prepared (100±5 μm thickness, diameter 11.8 mm, power zero), and a constant tear film concentration of 170±30 μg/mL was measured for up to 26 hrs in a New Zealand white rabbit model. The results showed a dramatic increase in ketotifen mean residence time (MRT) and bioavailability compared to topical drop therapy and drug soaked lenses. The MRT for imprinted lenses was 12.47±3.99 hrs, ~4 and 50 fold greater than non-imprinted lenses and 0.035% eye drops (Zaditor®), respectively. Furthermore, AUC(0-26 hrs) was 9 and 94 fold greater for imprinted lenses than non-imprinted lenses and eye drops, respectively. The results indicate that molecular imprinting provides an exciting rational engineering strategy for sustained release. It is clear that imprinted lenses are very promising combination devices and are much more effective and efficient delivery devices than eye drops.
authors: Biomimetic & Biohybrid Materials, Biomedical Devices, & Drug Delivery Laboratories, Department of Chemical Engineering, Auburn University, Auburn, AL 36849-5127, USA.
authors: A
authors: A
authors: Tieppo
authors: C J
authors: CJ
authors: White
authors: A C
authors: AC
authors: Paine
authors: M L
authors: ML
authors: Voyles
authors: M K
authors: MK
authors: McBride
authors: M E
authors: ME
authors: Byrne
mesh_terms: D000818:Animals; D018926:Anti-Allergic Agents / Q000008:administration & dosage*; D003263:Contact Lenses, Hydrophilic; D003692:Delayed-Action Preparations; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D007665:Ketotifen / Q000008:administration & dosage*; D008297:Male; D054802:Molecular Imprinting; D011817:Rabbits; D013666:Tears / Q000737:chemistry
chemical_list: D018926:Anti-Allergic Agents; D003692:Delayed-Action Preparations; C514418:ketotifen fumarate ophthalmic solution; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D007665:Ketotifen