INTRODUCTION
The innovative concept of utilising a highly hydrophilic protein surface film to provide an easy-to-clean effect has recently been demonstrated (1). The novel surface properties of the hydroxyproline-rich-protein-based additive NOVOTEC® CB800 enable it to adsorb to surfaces in the presence of surfactants and render the surface hydrophilic. The surface film partially dissolves during subsequent rinses, releasing surfactants that facilitate cleaning while a thin protein surface film remains. The recent coronavirus pandemic has shown that there is a need for residual antiviral surface protection that lasts beyond the moment in time when the product is applied to the surface. SARS-CoV-2 remains viable on smooth stainless steel and plastic surfaces for up to 7 days (2). However, it is readily inactivated with a range of well-known disinfectants including those used routinely in the food industry including bleach (1 %), chlorhexidine (0.05 %) and benzalkonium chloride (0.1 %) (2). Despite routine cleaning with these agents, surface transmission has still occurred, for example in food processing facilities (3). This suggests that there is a need for the improvement of existing cleaners to offer residual activity over a period of hours or days, especially for contact surfaces in high-use areas such as public transport. The effectiveness of the disinfectants against SARS-CoV-2 and the known surface adsorption of the hydroxyproline-rich-protein NOVOTEC® CB800 provides an excellent starting point for the development of a novel surface cleaner.
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