McMaster researchers have developed a novel new gel made entirely from bacteria-killing viruses.
The anti-bacterial gel, which can be targeted to attack specific forms of bacteria, holds promise for numerous beneficial applications in medicine and environmental protection.
Among many possibilities, it could be used as an antibacterial coating for implants and artificial joints, as a sterile growth scaffold for human tissue, or in environmental cleanup operations, says chemical engineer Zeinab Hosseini-Doust.
Her lab, which specializes in developing engineering solutions for infectious disease, grew, extracted and packed together so many of the viruses — called bacteriophages, or simply phages — that they assembled themselves spontaneously into liquid crystals and, with the help of a chemical binder, formed into a gelatin-like substance that can heal itself when cut.
The aim of this study was to isolate Listeria monocytogenes from chicken neck skins and lytic bacteriophages from poultry slaughterhouse wastewaters, and following the characterization of the isolates, biocontrol of L. monocytogenes was investigated on chicken drumsticks with the isolated phages. L. monocytogenes prevalence was detected 12.3% in the chicken samples and the dominant serotype was determined as 1/2a (92.5%). Expression levels of major virulence genes were revealed by real‐time RT‐PCR. Ten different DNA profiles were detected by ERIC‐PCR fingerprinting. According to the MIC results, LM‐P75 was defined as MDR by showing resistance to antibiotics in six different groups. Besides, five lytic listeriophages were isolated from wastewaters and treated with Cla1 and Sac1. Taking EoP, TEM, in vitro, and in vivo analyses results into consideration, three bacteriophages were used for the biocontrol assay. The application of the bacteriophages on drumsticks achieved a reduction up to 3.3 log CFU/ml in L. monocytogenes count in 3 hr of incubation at 4°C.
Our results showed that in spite of the developments in hygiene practices during slaughtering, chicken meat is still a potential source for L. monocytogenes. On the other hand, the phage cocktail that used in this study can be an effective tool to reduce L. monocytogenes in chicken carcasses at final wash or at cooling step in poultry slaughtering process, as well as in decontamination of chicken meat parts.
Posted in Bacteriophage, food contamination, Food Hygiene, Food Microbiology, Food Microbiology Blog, Food Pathogen, Food Safety, Food Technology, Food Testing, Food Toxin, Listeria, Listeria monocytogenes, Uncategorized
WAGENINGEN, Netherlands, Sept. 18, 2018 /PRNewswire/ — FDA & USDA announced they have approved Phageguard-E as a “GRAS” (Generally Recognized as Safe) food processing aid against E.coli O157. The new product consists of natural phages against E.coli and is produced by Micreos of The Netherlands. The company confirms that industrial scale projects with US meat processing companies are set to start shortly.
Micreos, a pioneer in targeted pathogen reduction technology continues to expand its product portfolio. Today it announced that PhageGuard-E, a new surface intervention to combat E. coli O157 on food products, will now be available for the US beef industry. The findings are of particular interest to beef processors looking for natural and effective post harvest interventions, reducing E. coli O157 on beef carcasses, primals, subs and trimmings. Recent research conducted at the University of Neveda demonstrated superior results of PhageGuard-E surface spray on E. coli O157 contaminated fresh cold beef over currently used chemicals.