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- Title
Comparison of UVA- and UVA/riboflavin-induced growth inhibition of Acanthamoeba Castellanii.
- Authors
Makdoumi, Karim; Bäckman, Anders; Mortensen, Jes; Magnuson, Anders; Crafoord, Sven
- Abstract
Purpose: To investigate whether ultraviolet light (UVA) at 365 nm can inhibit/eliminate Acanthamoeba growth and if riboflavin would potentiate such an association. Methods: Acanthamoeba castellanii in a fluid medium with a concentration of approximately 1.7 × 10 protozoa/ml were prepared with (0.01 %) and without riboflavin. Exposure of UVA (dose 5.475 J/cm) took place twice, with each illumination period followed by culturing of 10 μl in peptone yeast-extract glucose (PYG) medium for 7 days. Every suspension prepared had a non-exposed control solution. Determination of Acanthamoeba was conducted daily, by count in Burker chamber days 4 through 7 after exposure. Statistical analysis was done by repeated-measurement ANOVA and post-hoc analysis for unpaired samples. Results: The exposure of ultraviolet light resulted in an inhibited growth of Acanthamoeba compared to the non-exposed solutions, with a statistically significant reduction over time ( p = 0.0003). The addition of riboflavin did not amplify the effect, and there were no tendencies for an interaction effect between UVA and riboflavin. Conclusions: The antiprotozoal effect of the UVA wavelength, utilized in CXL, is solely mediated by ultraviolet light, and riboflavin does not seem to amplify the antimicrobial efficacy.
- Subjects
ULTRAVIOLET radiation; VITAMIN B2; ACANTHAMOEBA castellanii; PROTOZOA; STATISTICS; ANTI-infective agents; ANTIPROTOZOAL agents
- Publication
Graefe's Archive of Clinical & Experimental Ophthalmology, 2013, Vol 251, Issue 2, p509
- ISSN
0721-832X
- Publication type
Article
- DOI
10.1007/s00417-012-2176-4