JAC Advance Access originally published online on December 6, 2005
Journal of Antimicrobial Chemotherapy 2006 57(2):335-338; doi:10.1093/jac/dki432
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Use of a new alginate film test to study the bactericidal efficacy of the high-level disinfectant ortho-phthalaldehyde
1 School of Pharmacy and Biomolecular Sciences, University of Brighton, Brighton BN2 4GJ, UK; 2 Welsh School of Pharmacy, Cardiff University, Redwood Building, King Edward VII Avenue, Cardiff CF10 3XL, UK
Received 4 March 2005; returned 19 April 2005; revised 22 June 2005; accepted 1 November 2005
* Corresponding author. Tel: +44(0)2920879088; Fax: +44(0)2920874149; E-mail: maillardj{at}cardiff.ac.uk
Objectives: To evaluate the merit of a new alginate efficacy film test to determine the bactericidal activity of the high-level disinfectant ortho-phthalaldehyde (OPA).
Methods: The efficacy of OPA was investigated using a new sodium alginate surface film test against Mycobacterium chelonae NCIMB 1474 and Epping, and Pseudomonas aeruginosa NCIMB 10421 under different test conditions.
Results: OPA was highly bactericidal against P. aeruginosa but its mycobactericidal efficacy was seriously reduced and produced
5 log reductions only at a concentration of 0.5% (w/v) within 3060 min without organic load.
Conclusions: The sodium alginate film efficacy was reproducible between repeats. Inactivation results depended upon the concentration of OPA, contact time, the presence of an organic load and the bacterial genera.
Keywords: disinfection , time-kill assay , mycobacteria , Pseudomonas aeruginosa