LAUSR

Abstract This study assessed the efficacy of five dry sanitizing treatments on Listeria monocytogenes biofilms grown on two different surface types; stainless steel (SS) and polypropylene (PP). Treatments with 70% ethanol and a commercial product (quaternary ammonium compound + isopropyl alcohol) exhibited similar weak performance on both SS and PP, with the exception of the commercial product on SS at 30 min. An inactivation curve (log N/N0), characterized by two plateaus, was observed on SS after the dry heat treatment (90 °C). However, there was no significant difference (p  4.9 × 10 min), with the exception of UV-C and ozone on PP (ca. 6 min). In conclusion, dry heat was the most effective treatment on SS, and gaseous ozone and UV-C on PP.