In Vitro Human Scleral Permeability of Fluorescein, Dexamethasone-Fluorescein, Methotrexate-Fluorescein and Rhodamine 6G and the Use of a Coated Coil as a New Drug Delivery System
| Autor: | Henry F. Edelhauser, Dayle H. Geroski, Leo H. Koole, Rudy M.M.A. Nuijts, Fred Hendrikse, L.P.J. Cruysberg |
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| Rok vydání: | 2002 |
| Předmět: |
Contrast Media
In Vitro Techniques Dexamethasone Permeability Dosage form Rhodamine Rhodamine 6G chemistry.chemical_compound Drug Delivery Systems Coated Materials Biocompatible Humans Pharmacology (medical) Fluorescein Glucocorticoids Fluorescent Dyes Pharmacology Chromatography Rhodamines Middle Aged Fluorescence eye diseases Drug Combinations Ophthalmology Methotrexate chemistry Permeability (electromagnetism) Drug delivery sense organs Perfusion Sclera |
| Zdroj: | Journal of Ocular Pharmacology and Therapeutics. 18:559-569 |
| ISSN: | 1557-7732 1080-7683 |
| Popis: | To determine the in vitro human scleral permeability of several dyes and drugdye combinations with varying molecular weights (MW) and lipid solubilities (fluorescein, dexamethasone-fluorescein, methotrexate-fluorescein, and rhodamine). Coils coated with rhodamine were also evaluated for scleral permeability and sustained release.Scleral sections excised from moist chamber stored human globes were mounted in a 2-compartment perfusion chamber. A small depot of drug/dye (100 microl of 10(-4) M fluorescein, dexamethasone-fluorescein, methotrexate-fluorescein or rhodamine) or a coated coil in 100 microl of BSS was added to the episcleral surface while perfusing BSS to the choroidal side. The perfusate was collected and measured for fluorescence. Permeability was calculated as Ktrans from the flux measurements.Ktrans values (cm/sec, mean +/- SE) for the studied dyes and drug-dye combinations were 5.21 +/- 0.71 x 10(-6) for fluorescein, 1.64 +/- 0.17 x 10(-6) for dexamethasone-fluorescein, 3.36 +/- 0.62 x 10(-6) for methotrexate-fluorescein, 1.86 +/- 0.39 x 10(-6) for rhodamine and 2.18 +/- 0.23 x 10(-6) for the rhodamine from the coils. We found a significant difference between the permeability of the sclera to fluorescein and dexamethasone-fluorescein (P0.001), methotrexate-fluorescein (P0.05) and rhodamine (P0.001). Steady state flux was observed from the rhodamine coil.The rank order of scleral permeability to the studied dyes is as follows: fluoresceinmethotrexate-fluoresceinrhodamine coilrhodamine 6Gdexamethasone-fluorescein. Differences in scleral permeability are related to MW and lipid solubility. Prolonged transscleral diffusion of rhodamine delivered by solution and by coil are similar. |
| Databáze: | OpenAIRE |
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