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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Estimated concentrations of all other impurities (summed). The dotted line represents the USP limits permitted for total impurities in alcohol-based hand rubs (liquid, samples 1 to 26; gelled, samples 27 to 42) obtained from local and online merchants.