S enterica atcc 35664

MAX phase (Ti₃AlC₂) (Carbon-Ukraine Co., Kiev, Ukraine), lithium fluoride (Sigma-Aldrich, Co., Burlington, MA, USA), and hydrochloric acid (Sigma-Aldrich Co., Darmstadt, Hesse, Germany) were used in the synthesis of the filler particles, MXene. In addition, to obtain the composites, a poly lactic acid matrix, (PLA, IngeoTM Biopolymer 2003D NatureWorks, Plymouth, MN, USA) and dichloromethane (labkem, Barcelona, Catalonia, Spain) were used. S. enterica (ATCC 35664) obtained from the American Type Culture Collection (ATCC, Washington D.C., MD, USA) and L. monocytogenes obtained from a sample retrieved in the University Hospital Príncipe de Asturias were used in the antibacterial activity tests. fHDF/TER166 human fibroblasts (Evercyte, Vienna, Austria) were used in the cytotoxicity assay.

Copper(II) nitrate (Sigma-Aldrich, Madrid, Spain), ethanol 99.5% (Quimipur, Madrid, Spain), acetic acid glacial (Panreac, Barcelona, Spain), nitric acid (Scharlau, Barcelona, Spain), dichloromethane (Labkem, Barcelona, Spain), sodium nitrate (Sigma-Aldrich, Madrid, Spain), MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide) dye (Sigma Cat. No. M5655, Sigma-Aldrich, Madrid, Spain), and filter membranes (Magna, Nylon 47 mm 0.45 µm membrane disk, Fisher Scientific, Waltham, MA, USA) were used throughout the study. Low density polyethylene (LDPE, Riblene MP30R, d25 °C = 0.925 g/cm³, melting point of 112 °C, Versalis, Milan, Italy) and polylactic acid (PLA, IngeoTM Biopolymer 2003D NatureWorks, Blair, NE, USA) were kindly gifted by EMSUR (Spain). S. enterica (ATCC 35664) was obtained from the American Type Culture Collection (ATCC, Manassas, VA, USA) and L. monocytogenes was obtained from a sample recovered at the Hospital Universitario Príncipe de Asturias (Alcalá de Henares, Spain).