Research Publications (Food Safety)

ABSTRACT

BACKGROUND

Knowledge on the culturable bacteria and foodborne pathogen presence on pears is important to understand the impact of postharvest practices on food safety assurance. Pear fruit bacteria were investigated from the point of harvest, following chlorine drenching and after controlled atmosphere (CA) storage to assess the impact on the natural bacterial populations and potential foodborne pathogens.

Sarah E. Clark, Holly C. Filak, Brandon S. Guthrie, Rebecca L. Schmidt, Amanda Jamieson, Patricia Merkel, Vijaya Knight, Caroline M. Cole, David H. Raulet, Laurel L. Lenz

The unique Escherichia coli GTPase Der (Double Era-like GTPase), which contains tandemly repeated GTP-binding domains, has been shown to play an essential role in 50S ribosomal subunit biogenesis. The depletion of Der results in the accumulation of precursors of 50S ribosomal subunits that are structurally unstable at low Mg2+ concentrations. Der homologs are ubiquitously found in eubacteria. Conversely, very few are conserved in eukaryotes and none is conserved in archaea.

Publication date: December 2016
, Volume 70

Author(s): Hajime Takahashi, Ai Iwakawa, Krittaporn Thanatsang, Chihiro Ohshima, Miku Nakagawa, Chirapiphat Phraephaisarn, Yuphakhun Chaturongkasumrit, Takashi Kuda, Bon Kimura, Suwimon Keeratipibul

Microbial contamination in food processing plants can play a fundamental role in food quality and safety. The aims of this study were to learn more about the possible influence of the meat processing environment on initial fresh meat contamination and to investigate the differences between small-scale retail distribution (SD) and large-scale retail distribution (LD) facilities.

Listeria monocytogenes senses blue light via the flavin mononucleotide-containing sensory protein Lmo0799, leading to activation of the general stress response sigma factor SigB (B). In this study, we investigated the physiological response of this foodborne pathogen to blue light. We show that blue light (460 to 470 nm) doses of 1.5 to 2 mW cm–2 cause inhibition of growth on agar-based and liquid culture media.

Raw sausages are perishable foodstuffs; reducing their salt content raises questions about a possible increased spoilage of these products. In this study, we evaluated the influence of salt reduction (from 2.0% to 1.5% [wt/wt]), in combination with two types of packaging (modified atmosphere [50% mix of CO2-N2] and vacuum packaging), on the onset of spoilage and on the diversity of spoilage-associated bacteria.

Shiga toxin-producing Escherichia coli (STEC) and enteropathogenic E. coli (EPEC) strains may be responsible for food-borne infections in humans. Twenty-eight STEC and 75 EPEC strains previously isolated from French shellfish-harvesting areas and their watersheds and belonging to 68 distinguishable serotypes were characterized in this study. High-throughput real-time PCR was used to search for the presence of 75 E.

Escherichia coli O26 is the second most important enterohemorrhagic E. coli (EHEC) serogroup worldwide. Serogroup O26 strains are categorized mainly into two groups: enteropathogenic (EPEC) O26, carrying a locus of enterocyte effacement (LEE) and mostly causing mild diarrhea, and Shiga-toxigenic (STEC) O26, which carries the Shiga toxin (STX) gene (stx), responsible for more severe outcomes. stx-negative O26 strains can be further split into two groups.

Use of antimicrobials in industrial food animal production is associated with the presence of multidrug-resistant Staphylococcus aureus among animals and humans. The livestock-associated (LA) methicillin-resistant S. aureus (MRSA) clonal complex 9 (CC9) is associated with animals and related workers in Asia. This study aimed to explore the genotypic and phenotypic markers of LA-MRSA CC9 in humans. We conducted a cross-sectional study of livestock workers and controls in Guangdong, China.

Five isolates from chilled food and refrigerator inner surfaces and closely related reference strains of the species Escherichia coli, Listeria monocytogenes, Staphylococcus xylosus, Bacillus cereus, Pedobacter nutrimenti, and Pedobacter panaciterrae were tested for the effect of growth temperature (30°C and 10°C) on biomass formation.

Antimicrobial resistance (AMR) is a global health problem, and emerging semi-intensive farming systems in Southeast Asia are major contributors to the AMR burden.

Abstract

Online Ahead of Print.

Elisabetta Di Giannatale, Giuliano Garofolo, Alessandra Alessiani, Guido Di Donato, Luca Candeloro, Walter Vencia, Lucia Decastelli, Francesca Marotta

Publication date: November 2016
Source:LWT - Food Science and Technology, Volume 73

Author(s): Catarina Moreirinha, Adelaide Almeida, Jorge A. Saraiva, Ivonne Delgadillo

Publication date: December 2016
, Volume 70

Author(s): Dean Burfoot, Jeremy Hall, Keith Nicholson, Kirsty Holmes, Cedric Hanson, Simon Handley, Elizabeth Mulvey

Publication date: November 2016
Source:LWT - Food Science and Technology, Volume 73

Author(s): Esmail Abdollahzadeh, Seyed Mahdi Ojagh, Hedayat Hosseini, Gholamreza Irajian, Ezzat Allah Ghaemi

Publication date: October 2016
, Volume 120

Author(s): J. Scollard, O. McManamon, A. Schmalenberger

Publication date: Available online 9 June 2016


Author(s): M. Angeles Argudín, Birgit Lauzat, Britta Kraushaar, Patricia Alba, Yvonne Agerso, Lina Cavaco, Patrick Butaye, M. Concepción Porrero, Antonio Battisti, Bernd-Alois Tenhagen, Alexandra Fetsch, Beatriz Guerra

Summary

Natacha C. Gómez, Juan M. P. Ramiro, Beatriz X. V. Quecan, Bernadette D. G. de Melo Franco

Abstract

Aims

To evaluate the antibacterial efficacy of novel antimicrobial peptides (AMPs) against multidrug-resistant (MDR) Salmonella enterica serovar Choleraesuis (S. Choleraesuis) and to delineate the AMP-responsive mechanisms of wild-type (WT) and MDR strains.

Muhabat A. Raji, Ghada Garaween, Ralf Ehricht, Stefan Monecke, Atef M. Shibl, Abiola Senok