Antimicrobial activity of different coatings for packaging materials containing functional extenders against selected microorganisms typical for food

• Published in: Food control Vol. 148; p. 109669
• Main Authors: Korte, Imke, Petry, Michael, Kreyenschmidt, Judith
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2023
• Subjects: Acrylate polymer; Antimicrobial activity; Food storage; Mineral binder; Packaging coating; Styrene-acrylate polymer; Mineral binder; Antimicrobial activity; Acrylate polymer; Styrene-acrylate polymer; Packaging coating; Food storage
• ISSN: 0956-7135; 1873-7129
• DOI: 10.1016/j.foodcont.2023.109669

The antimicrobial activity of different coatings for packaging materials consisting of a mineral binder based on liquid potassium silicate, non-conserved acrylates, and non-conserved styrene-acrylates as binders using functional, active extenders was investigated. The influence of time, temperature, and product factors on the antimicrobial activity against different bacteria were determined (ISO 22196:2007). showed a significant reduction in bacterial counts on all tested surface coatings compared to the reference, a glass plate without any coating, (24 h, 35 °C). Bacterial counts of Staphylococcus aureus, Escherichia coli, and Pseudomonas fluorescens were reduced between 3.32 (M8 against Staphylococcus aureus) and 7.01 log10 units (M1 against Pseudomonas fluorescens). A high initial bacteria concentration (108 cfu ml−1) leads to a bacterial reduction between 1.21 (M8 against Staphylococcus aureus) and 7.57 log10 units (M4 against Pseudomonas fluorescens). Incubation at a low temperature (7 °C) for prolonged storage (120 h) resulted in a reduced reduction rate for Staphylococcus aureus < 2.00 log10 units. For most coatings, antimicrobial activity was shown in the presence of several food components as well as different pH values. The studied coatings show a high antimicrobial activity under different test conditions typical for perishable food supply chains and bear a high potential as a coating for packaging materials to increase the safety and quality of perishable products (in chilled storage). •Antimicrobial activity of organic coatings under conditions typical for chilled food.•High potential as coating for packaging to increase the safety and quality of food.•Mineral binder combined with biopolymer shows antimicrobial activity without additive.