Research on the Persistence of Antibacterial and Antiviral Effects after Handwashing with Hand Soap

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  • Toki Risako
    Beauty Care Research Laboratories, Research and Development Headquarters, Lion Corporation
  • Horiuchi Jumpei
    Beauty Care Research Laboratories, Research and Development Headquarters, Lion Corporation
  • Asano Hotaka
    Beauty Care Research Laboratories, Research and Development Headquarters, Lion Corporation
  • Tachikawa Masashi
    Global Development Center, Research and Development Headquarters, Lion Corporation
  • Shirae Wataru
    Global Development Center, Research and Development Headquarters, Lion Corporation
  • Koga Takeichiro
    Beauty Care Research Laboratories, Research and Development Headquarters, Lion Corporation
  • Naito Atsushi
    Global Development Center, Research and Development Headquarters, Lion Corporation

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Other Title
  • ハンドソープを用いた手洗いによる抗菌・抗ウイルス効果の持続性に関する研究

Abstract

<p>The importance of handwashing has become widespread among consumers due to the increased awareness of hygiene following the spread of COVID-19 and awareness-raising activities by the government. However, as a result of a consumer survey, we confirmed that people want to know the antibacterial and antiviral sustainability after handwashing. In this study, we set up a model experimental system assuming the risk of contamination after handwashing, and measured the antibacterial and antiviral effects of different surfactants. As a result of our investigation, the number of viable bacteria was high on public doorknobs and the frequency of touching them was also high. Therefore, assuming the behavior of touching a doorknob four times an hour, we measured the antibacterial and antiviral effects by quantifying the amount of remaining bacteria or viruses when the bacterial or viral solution was applied to the washed model skin every 20 min. The results showed that washing with fatty acid salts decreased the residual amount of bacteria and viruses even after repeated applications, suggesting that the antibacterial and antiviral effects were highly sustained. We consider both deactivating performance and the remaining of surfactant may affect the persistence of antibacterial and antiviral effects.</p>

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