Research Publications (Food Safety)

Chickens are regarded as the main reservoir for human campylobacteriosis. Little is known about the interaction between Campylobacter jejuni (C. jejuni) and chickens. This interaction may be influenced by the sta...

Abstract

The axy43A gene encoding the intracellular trifunctional xylanolytic enzyme from Paenibacillus curdlanolyticus B-6 was cloned and expressed in Escherichia coli. Recombinant PcAxy43A consisting of a glycoside hydrolase family 43 and a family 6 carbohydrate-binding module exhibited endo-xylanase, β-xylosidase, and arabinoxylan arabinofuranohydrolase activities.

Ethidium monoazide and propidium monoazide (EMA and PMA) have been used in combination with PCR for more than a decade to facilitate the discrimination of live and dead bacteria (LD discrimination). These methods, however, require many laborious procedures, including the use of a darkroom.

In host and natural environments, microbes often exist in complex multispecies communities. The molecular mechanisms through which such communities develop and persist, despite significant antagonistic interactions between species, are not well understood. The type VI secretion system (T6SS) is a lethal weapon commonly employed by Gram-negative bacteria to inhibit neighboring species through the delivery of toxic effectors.

Various Listeria monocytogenes strains may contaminate a single food product, potentially resulting in simultaneous exposure of consumers to multiple strains. However, due to bias in strain recovery, L. monocytogenes strains isolated from foods by selective enrichment (SE) might not always represent those that can better survive the immune system of a patient.

Publication date: Available online 9 November 2016


Author(s): Lydia-Marie Joubert, Jose AG Ferreira, David A Stevens, Hasan Nazik, Lynette Cegelski

Sophie-Marie Martirani-Von Abercron, Daniel Pacheco, Patricia Benito-Santano, Patricia Marín, Silvia Marqués

Letícia Dias de Melo Carrasco, Ronaldo Bertolucci, Rodrigo T. Ribeiro, Jorge L. M. Sampaio, Ana M. Carmona-Ribeiro

Abstract

Roxarsone (Rox), an organoarsenic compound, served as a feed additive in the poultry industry for more than 60 years. Residual amounts of Rox present in chicken meat could give rise to potential human exposure to Rox. However, studies on the bioavailability of Rox in humans are scarce. We report here the accumulation and transepithelial transport of Rox using the human colon-derived adenocarcinoma cell line (Caco-2) model.

One of the foodborne pathogens is Listeria monocytogenes, which causes serious invasive illness in elderly and immunocompromised patients, pregnant women, newborns and infants ranking second after salmonellosis b...

Ribonuclease Y (RNase Y) is a major endoribonuclease that plays a crucial role in mRNA degradation and processing. We study the role of RNase Y in the Gram-positive anaerobic pathogen Clostridium perfringens, which has until now not been well understood. Our study implies an important role for RNase Y-mediated RNA degradation and processing in virulence gene expression and the physiological development of the organism.

Abstract

Abstract

In this paper a method of using the “quick, easy, cheap, effective, rugged, and safe” (QuEChERS) extraction and gas chromatography coupled to mass spectrometry detection (GC–MS) was developed for the analysis of five frequently applied pesticides in papaya and avocado. The selected pesticides, ametryn, atrazine, carbaryl, carbofuran, and methyl parathion, represent the most commonly used classes (carbamates, organophosphorous, and triazines).

Abstract

Publication date: May 2017
, Volume 63

Author(s): María del Carmen Villalobos, Manuel Joaquín Serradilla, Alberto Martín, Alejandro Hernández-León, Santiago Ruíz-Moyano, María de Guía Córdoba

Zinc-substituted myoglobin (ZnMb) is a naturally occurring photosensitizer that generates singlet oxygen with a high quantum yield. Using a combination of photophysical and fluorescence imaging techniques, we demonstrate the interaction of ZnMb with Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli. An efficient antibacterial action against S.

Summary

Publication date: Available online 3 November 2016


Author(s): Pranav Chettri, Rosie E. Bradshaw

Abstract

Aims

The aim of this study was to verify the suitable use of candidate ‘probiotics’ selected by in vitro tests and the importance of in vivo assays to nominate the microorganisms as probiotics and alternatives prophylactic treatments for Salmonella Typhimurium infection.

ABSTRACT

BACKGROUND

In recent years, improved detection methods and increased fresh-cut processing of produce have led to an increased number of outbreaks associated with fresh fruits and vegetables. During fruit and vegetable processing, natural protective barriers are removed and tissues are cut, causing nutrient rich exudates and providing attachment sites for microbes. Consequently, fresh-cut produce is more susceptible to microbial proliferation than whole produce.

Publication date: Available online 3 November 2016


Author(s): Kaissar Tabynov, Bolat Yespembetov, Nurali Matikhan, Sholpan Ryskeldinova, Nadezhda Zinina, Zhailaubay Kydyrbayev, Nurika Assanzhanova, Kairat Tabynov, Gourapura J Renukaradhya, Gulnara Mukhitdinova, Abylai Sansyzbay