Evaluation of the in vitro antimicrobial properties of ultraviolet A/riboflavin mediated crosslinking on Candida albicans and Fusarium solani

Bing Sun; Zhi-Wei Li; Hai-Qun Yu; Xiang-Chen Tao; Yong Zhang; Guo-Ying Mu

doi:10.3980/j.issn.2222-3959.2014.02.04

Evaluation of the in vitro antimicrobial properties of ultraviolet A/riboflavin mediated crosslinking on Candida albicans and Fusarium solani

Int J Ophthalmol. 2014 Apr 18;7(2):205-10. doi: 10.3980/j.issn.2222-3959.2014.02.04. eCollection 2014.

Authors

Bing Sun¹, Zhi-Wei Li², Hai-Qun Yu³, Xiang-Chen Tao², Yong Zhang², Guo-Ying Mu²

Affiliations

¹ Department of Ophthalmology, Provincial Hospital Affiliated to Shandong University, Jinan 250021, Shandong Province, China ; Department of Ophthalmology, Provincial Hospital Affiliated to Anhui Medical University, Hefei 230001, Anhui Province, China.
² Department of Ophthalmology, Provincial Hospital Affiliated to Shandong University, Jinan 250021, Shandong Province, China.
³ Department of Ophthalmology, Affiliated Hospital of Weifang Medical University, Weifang 261031, Shandong Province, China.

PMID: 24790859
PMCID: PMC4003071
DOI: 10.3980/j.issn.2222-3959.2014.02.04

Abstract

Aim: To evaluate the antimicrobial properties of ultraviolet A (UVA) (365 nm)/riboflavin against Candida albicans and Fusarium solani.

Methods: Two fungus isolates were cultured in vitro and prepared with 10-fold serial PBS dilutions of cell concentration. For each dilution of fungus suspension, the concentration (colony-forming units/mL, CFU/mL) and the inactivation ratio of fungal cells were evaluated under 4 conditions: no treatment (control), UVA (365 nm)/riboflavin, riboflavin, and UVA (365 nm).

Results: The cell concentration decreased in UVA (365 nm)/riboflavin group for Candida albicans at each dilution and Fusarium solani at dilutions of 10(4), 10(3), 10(2) CFU/mL, when compared with that in control, riboflavin, and UVA (365 nm) groups (P<0.01). No difference of cell concentration was detected amongst the culture of control, riboflavin, and UVA (365 nm) groups for the two fungus. There is a negative correlation between suspension concentration (log-transformed) and the inactivation ratio in UVA (365 nm)/riboflavin group for Candida albicans and Fusarium solani (P<0.01).

Conclusion: According to the standard protocol of corneal collagen cross-linking, UVA (365 nm)/riboflavin combination treatment is found to moderately inactivate the viability of Candida albicans and Fusarium solani in vitro. The inactivation ratio was found to increase with the decrease of cell concentration under UVA (365 nm)/riboflavin condition.

Keywords: antimicrobial; crosslinking; fungal; riboflavin; ultraviolet A.