M Suchomel1, M Rotter, M Weinlich, M Kundi. 1. Institute of Hygiene and Applied Immunology, Medical University of Vienna, Vienna, Austria. miranda.suchomel@meduniwien.ac.at
Abstract
BACKGROUND: Glycerol in alcohol-based hand rubs has positive effects on skin condition and user acceptability, but, to the authors' knowledge, its effect on the bactericidal effect of alcohol-based pre-operative hand rubs has not been reported. AIM: To investigate the impact of glycerol on the reduction of resident hand flora by ethanol 80% (w/w), isopropanol 75% (w/w) and n-propanol 60% (V/V). METHODS: In three series of in-vivo laboratory tests on volunteers hands, the efficacy of each of three alcohol-based formulations was tested concurrently with and without added glycerol 1.45% (V/V) according to European Norm EN 12791 for testing pre-operative hand rubs. Formulations were allotted at random to 24 volunteers to rub on to their hands for 3 min. Viable counts from fingertip samples were compared with the respective pretreatment counts immediately after treatment and 3 h later. FINDINGS: The 3-h bactericidal effects of the three pure alcoholic formulations were significantly greater than those of formulations containing glycerol (P < 0.01). With ethanol, this was also true for the immediate effect. CONCLUSION: Glycerol 1.45% (V/V) inhibits the bactericidal efficacy of alcohol-based surgical hand rubs, especially sustained efficacy.
BACKGROUND:Glycerol in alcohol-based hand rubs has positive effects on skin condition and user acceptability, but, to the authors' knowledge, its effect on the bactericidal effect of alcohol-based pre-operative hand rubs has not been reported. AIM: To investigate the impact of glycerol on the reduction of resident hand flora by ethanol 80% (w/w), isopropanol 75% (w/w) and n-propanol 60% (V/V). METHODS: In three series of in-vivo laboratory tests on volunteers hands, the efficacy of each of three alcohol-based formulations was tested concurrently with and without added glycerol 1.45% (V/V) according to European Norm EN 12791 for testing pre-operative hand rubs. Formulations were allotted at random to 24 volunteers to rub on to their hands for 3 min. Viable counts from fingertip samples were compared with the respective pretreatment counts immediately after treatment and 3 h later. FINDINGS: The 3-h bactericidal effects of the three pure alcoholic formulations were significantly greater than those of formulations containing glycerol (P < 0.01). With ethanol, this was also true for the immediate effect. CONCLUSION:Glycerol 1.45% (V/V) inhibits the bactericidal efficacy of alcohol-based surgical hand rubs, especially sustained efficacy.
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