Modification of aluminum surfaces with superhydrophobic nanotextures for enhanced food safety and hygiene.

Abstract As a result of frequent outbreaks occurring due to poor hygiene and improper sanitation of processing environments, there has been an increasing demand for the development of food-contact surface materials that intrinsically inhibit and reduce likelihood of potential microbial adherence and biofilm formation. Herein, we report the synergistic utilization of surface nanotexturing and chemical modifications with nonpolar functional groups on aluminum surfaces to produce coatings having bacterial super-repellant and mud anti-fouling characteristics. Using these coatings, the attachment of Salmonella Typhimurium LT2 and Listeria innocua as pathogen surrogates was reduced more than 99.0%, compared to the bare aluminum surfaces. In addition, the coating strongly resisted the adhesion of mud, showing a 10-fold reduction in the area of mud adhesion upon submerging in mud solution. Moreover, this method is both versatile and scalable, involving inert and biocompatible building blocks. Overall, this study contributes to the field of food safety through the design and development of novel coatings for achieving improved food safety and hygiene. Highlights • Biocompatible silica-based superhydrophobically-modified aluminum surfaces were developed. • Attachment of Salmonella Typhimurium LT2 and Listeria innocua was reduced by >99.0%. • Superhydrophobically-modified aluminum surfaces exhibited excellent mud-repelling activity. • Bacterial anti-adhesion properties are attributed to weak intermolecular interactions. • The proposed surface modification method can be applied to metal food-contact surfaces. [ABSTRACT FROM AUTHOR]