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• W2030488303 abstract "purpose. To investigate the concentration and bioavailability of ciprofloxacin and teicoplanin in the cornea. methods. A biological assay was developed with corneal tissue used as a carrier for the antimicrobial. Concentration and biological activity were determined with a chemical assay and zone of inhibition (ZOI) around corneal samples with epithelial and endothelial surfaces in contact with the indicator organism. Patients undergoing penetrating keratoplasty received ciprofloxacin 0.3% or teicoplanin 1%. results. There were good correlations between antimicrobial concentration and ZOI, when either filter paper or corneal discs were used (R 2 > 92%). Of 33 patients, the mean (median) concentration of ciprofloxacin in the cornea was 1.37 mg/L (0.46 mg/L) and 1.89 mg/L (1.44 mg/L; bioassay) in the epithelial and endothelial orientations, respectively, and 14.87 mg/L (7.41) in the cornea and 0.51 mg/L (0.42) in the aqueous (chemical assay). For teicoplanin, the mean (median) concentration in the cornea was 9.58 mg/L (0 mg/L) in the epithelial and 4.78 mg/L (0 mg/L) in the endothelial orientations (bioassay). In the chemical assay, teicoplanin could not be detected in the cornea or aqueous at the lower limit of detection of 3.6 mg/L. conclusions. The ZOI produced by corneal tissue provides a potential bioassay of antimicrobial activity and concentration. Although in contrast to teicoplanin ciprofloxacin shows good corneal penetration, with high endothelial-to-epithelial levels, only approximately 10% of measured levels in a chemical assay are available, according to a bioassay. Teicoplanin shows relatively poor corneal penetration through intact epithelium. These methods may be useful in evaluating the biological activity across the cornea of antimicrobials introduced into ophthalmic practice to deal with changing bacterial resistance." @default.
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• W2030488303 date "2009-07-01" @default.
• W2030488303 modified "2023-10-16" @default.
• W2030488303 title "Concentration and Bioavailability of Ciprofloxacin and Teicoplanin in the Cornea" @default.
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• W2030488303 doi "https://doi.org/10.1167/iovs.08-3201" @default.
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