RESUMO
This study investigates the potential of using bacteriophages to control foodborne pathogen biofilms on stainless steel surfaces in the food industry. Biofilm-forming bacteria can attach to stainless steel surfaces, rendering them difficult to eradicate even after a thorough cleaning and sanitizing procedures. Bacteriophages have been proposed as a possible solution, as they can penetrate biofilms and destroy bacterial cells within, reducing the number of viable bacteria and preventing the growth and spread of biofilms. This systematic review and meta-analysis evaluates the potential of bacteriophages against different biofilm-forming foodborne bacteria, including Cronobacter sakazakii, Escherichia coli, Staphylococcus aureus, Pseudomonas fluorescens, Pseudomonas aeruginosa and Listeria monocytogenes. Bacteriophage treatment generally causes a significant average reduction of 38 % in biofilm formation of foodborne pathogens on stainless steel. Subgroup analyses revealed that phages are more efficient in long-duration treatment. Also, applying a cocktail of phages is 1.26-fold more effective than applying individual phages. Phages at concentrations exceeding 107 PFU/ml are significantly more efficacious in eradicating bacteria within a biofilm. The antibacterial phage activity decreases substantially by 3.54-fold when applied at 4 °C compared to temperatures above 25 °C. This analysis suggests that bacteriophages can be a promising solution for controlling biofilms in the food industry.
RESUMO
Foodborne Salmonella enteritidis infections place human health at risk, driven by regular outbreaks and individual cases by different contaminated food materials. This study was conducted to characterize and employ a single bacteriophage as a potential biocontrol agent. Phage Rostam was isolated, characterized and then applied as biocontrol agent against S. enteritidis in liquid whole eggs and eggshell. Rostam is a novel myovirus belonging to the Rosemountvirus genus and active against Escherichia coli and Salmonella spp. Rostam is stable in a pH range from 4 to 10, a salt concentration of 1-9 %, whereas UV radiation gradually reduces phage stability, and its 53 kb genome sequence indicates this phage does not contain known toxins or lysogeny-associated genes. Its latent period is short with a burst size of 151 PFU/cell, under standard growth conditions. Killing curves indicate that at higher multiplicities of infection (MOI), the reduction in S. enteritidis count is more pronounced. Phage Rostam (MOI 10,000) reduces S. enteritidis growth to below the detection limit at 4 °C in both liquid whole eggs and on the eggshell within 24 h. Due to its high lytic activity and stability in relevant conditions, Rostam has the potential to be an efficient biopreservative for egg and egg products.