Evaluating the antimicrobial efficacy of long-lasting hand sanitisers on skin

Duggan, Katrina, Bentley, Kirsten ORCID: https://orcid.org/0000-0002-6619-2098, Stanton, Richard J. ORCID: https://orcid.org/0000-0002-6799-1182 and Maillard, Jean-Yves ORCID: https://orcid.org/0000-0002-8617-9288 2023. Evaluating the antimicrobial efficacy of long-lasting hand sanitisers on skin. Journal of Hospital Infection 10.1016/j.jhin.2023.08.020

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Abstract

Background The microbicidal efficacy of hand sanitiser formulations is usually measured through standardized quantitative suspension tests and fingerpad tests; these cannot evaluate long-lasting formulations or are impractical due to biological risks, high cost, or time required for testing. With increased numbers of long-lasting microbicidal activity claims of commercially available hand sanitisers, alternative testing strategies are required. Aim To explore the use of a standardized ex-vivo pig skin model to reproducibly measure long-lasting efficacy of an alcohol-free hand sanitiser formulation. Methods The microbicidal efficacy of an alcohol-free hand sanitiser was tested against Staphylococcus aureus, Escherichia coli and Klebsiella pneumoniae, and the enveloped virus SARS-CoV-2 with quantitative suspension tests (EN13727 and EN14476) with a contact time of 5 min. The product was then tested over a 6-hour period using an ex-vivo pig skin model with a modified version of PAS 2424 to simulate the impact of skin abrasion. Findings Quantitative suspension tests yielded a > 5-log10 reduction for all organisms tested within a 5 min contact time. Pig skin tests showed reduced but consistent efficacy at all time points and indicated no significant impact of abrasion on efficacy. Conclusion The use of the ex-vivo pig skin model provides a potentially viable and convenient model system to test long-lasting hand sanitisers formulations, providing a path for sustainable hand sanitiser formulation claims of activity on skin.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Medicine Pharmacy Systems Immunity Research Institute (SIURI)
Publisher:	Elsevier
ISSN:	0195-6701
Funders:	Accelerate
Date of First Compliant Deposit:	16 October 2023
Date of Acceptance:	24 August 2023
Last Modified:	08 Nov 2024 11:30
URI:	https://orca.cardiff.ac.uk/id/eprint/162576

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