Research Publications (Food Safety)

Publication date: January 2016
, Volume 111
Author(s): Annalisa Petruzzelli, Andrea Osimani, Marina Pasquini, Francesca Clementi, Vittorio Vetrano, Francesca Paolini, Martina Foglini, Eleonora Micci, Alberto Paoloni, Franco Tonucci

This study was carried out to improve the microbiological safety and shelf life of minimally processed cabbage and carrots at 16CSalad vegetables can be a source of opportunistic pathogens and spoilage bacteria – namely, Aeromonas hydrophila, A. sobria and Pseudomonas syringae.

Patricia Alba, Fabiola Feltrin, Gessica Cordaro, María Concepción Porrero, Britta Kraushaar, María Angeles Argudín, Suvi Nykäsenoja, Monica Monaco, Marc Stegger, Frank M. Aarestrup, Patrick Butaye, Alessia Franco, Antonio Battisti

Thiamine pyrophosphate is a required cofactor for all forms of life. The pyrimidine moiety of thiamine, 2-methyl-4-amino-5-hydroxymethylpyrimidine phosphate (HMP-P), is synthesized by different mechanisms in bacteria and plants compared to fungi. In this study, Salmonella enterica was used as a host to probe requirements for activity of the yeast HMP-P synthase, Thi5p.

Abstract

Publication date: February 2016
, Volume 53, Part B
Author(s): Won-Jae Song, Dong-Hyun Kang

Publication date: 23 December 2015
, Volume 215
Author(s): Anna J. Williams, Willie M. Cooper, Christine V. Summage-West, Lillie M. Sims, Robert Woodruff, Jessica Christman, Ted J. Moskal, Shawn Ramsaroop, John B. Sutherland, Pierre Alusta, Jon G. Wilkes, Dan A. Buzatu

Publication date: 23 December 2015
, Volume 215
Author(s): Manuela Murgia, Brahim Bouchrif, Mohammed Timinouni, Ahmed Al-Qahtani, Mohammed N. Al-Ahdal, Pietro Cappuccinelli, Salvatore Rubino, Bianca Paglietti

Publication date: 23 December 2015
, Volume 215
Author(s): Yue Zhang, Qiumin Ma, Faith Critzer, P. Michael Davidson, Qixin Zhong

Publication date: 23 December 2015
, Volume 215
Author(s): Gui-Ying Mei, Joshua Tang, Christine Carey, Susan Bach, Magdalena Kostrzynska

Publication date: February 2016, Volume 53, Part B Author(s): Alexander W. Emch, Joy G. Waite-Cusic Food Safety Modernization Act (FSMA) has emphasized microbial risks associated with irrigation water. Treasure Valley (eastern Oregon/western Idaho) has the highest yield of dry bulb onions in the country; however, their irrigation water is often non-compliant with current industry and proposed federal standards for fresh produce.

Teramura, Hajime et al. The presence of expanded-spectrum β-lactamase (ESBL)–producing Escherichia coli is a common problem in the isolation of Campylobacter from poultry samples using conventional cefoperazone-based selective media. A novel chromogenic medium (CM-HT), based on modified charcoal cefoperazone deoxycholate agar (mCCDA), has been developed as a solution for improved Campylobacter detection from poultry samples.

Page, Jennifer A. et al. Cattle are an important reservoir for the foodborne pathogens Salmonella and Escherichia coli O157:H7; they frequently harbor these microorganisms in their digestive tracts and shed them in their feces. Thus, there is potential for contamination of cattle hides and, subsequently, carcasses. Interventions aimed at reducing or eliminating pathogen shedding preharvest will also reduce the likelihood of beef product contamination by these pathogens.

Knowles, Michael et al. Control strains of bacterial pathogens such as Escherichia coli O157:H7 are commonly processed in parallel with test samples in food microbiology laboratories as a quality control measure to assure the satisfactory performance of materials used in the analytical procedure. Before positive findings can be reported for risk management purposes, analysts must have a means of verifying that pathogenic bacteria (e.g., E.

Gill, Alexander et al.

Greve, Josephine D. et al.

Luo, Ke et al. The aim of this study was to model the growth kinetics of Listeria monocytogenes on ready-to-eat ham and sausage at different temperatures (4 to 35°C). The observed data fitted well with four primary models (Baranyi, modified Gompertz, logistic, and Huang) with high coefficients of determination (R2 > 0.98) at all measured temperatures.

Bolocan, Andrei Sorin et al. Putative routes of Listeria monocytogenes contamination, based on the workflow of the employees, were studied in a meat processing facility by investigating 226 samples collected from food contact surfaces, non–food contact surfaces, raw materials, and ready-to-eat meat products on four occasions over a 1-year period.

Kim, Dong-Hyeon et al.

Jarquin, Claudia et al. The objective of this study was to determine Salmonella numbers on retail raw chicken carcasses in Guatemala and to phenotypically characterize the isolates (serotyping and antibiotic susceptibility). In total, 300 chicken carcasses were collected from seven departments in Guatemala. Salmonella numbers were determined using the most-probable-number method following the U.S. Department of Agriculture's Food Safety and Inspection Service protocol.

Ryan, Gina et al. Assays for detection of foodborne pathogens are generally initially evaluated for performance in validation studies carried out according to guidelines provided by validation schemes (e.g., AOAC International or the International Organization for Standardization). End users often perform additional validation studies to evaluate the performance of assays in specific matrices (e.g., specific foods or raw material streams of interest) and with specific pathogen strains.

Erickson, Marilyn C. et al. Consumers are being advised to increase their consumption of fruits and vegetables to reduce their risk of chronic disease. However, to achieve that goal, consumers must be able to implement protocols in their kitchens to reduce their risk of consuming contaminated produce.

Publication date: Available online 29 August 2015

Author(s): C.F. Magistrali, L. Cucco, G. Pezzotti, S. Farneti, V. Cambiotti, S. Catania, P. Prati, M. Fabbi, S. Lollai, P. Mangili, C. Sebastiani, L. Bano, A.M. Dionisi, I. Luzzi

Two of the primary virulence regulators of Vibrio cholerae, ToxR and TcpP, function together with cognate effector proteins. ToxR undergoes regulated intramembrane proteolysis (RIP) during late stationary phase in response to nutrient limitation at alkaline pH, however, the specific function of its cognate ToxS remains unresolved.

In this studyfermentation of Allium chinense bulbs was carried out with Lactobacillus plantarum ZDY 2013. A decrease in pH from 6.8 to 3.5 and a stable lactic acid bacteria population were observed during 7-d fermentation. The total phenolic content increased by 2.7-fold in the aqueous and ethanol extracts of A. chinense bulbs after fermentation.