Research Publications (Food Safety)

by Dhruv B. Pai

Background

by Jocelyn A. Curtis-Quick, Alexander V. Ulanov, Zhong Li, John F. Bieber, Emily K. Tucker-Retter, Cory D. Suski

by Ilias Gountas, Georgios Nikolopoulos, Giota Touloumi, Anastasios Fotiou, Kyriakos Souliotis

Introduction

A. M. Smith et al. We describe the molecular epidemiology of cholera in South Africa during 2018–2020. Vibrio cholerae O1 sequence type (ST) 75 recently emerged and became more prevalent than the V. cholerae O1 biotype El Tor pandemic clone. ST75 isolates were found across large spatial and temporal distances, suggesting local ST75 spread.

Author(s): H.D. Geizer, S.J. Klapstein, M.L. Mallory, N.J. O’Driscoll

Author(s): Chuan-Hai Li, Dong-Hui Zhang, Li-Dan Jiang, Yuan Qi, Liang-Hong Guo

Author(s): Dimitrios Varvarousis, Christina Martzivanou, Dimitris Dimopoulos, Georgios Dimakopoulos, George I. Vasileiadis, Avraam Ploumis

Author(s): Kun Ma, Enjie Diao, Hui Zhang, Shiquan Qian, Peng Xie, Ruifeng Mao, Huwei Song, Liming Zhang

Author(s): Shuangshuang Wang, Yuanye Liu, Yan Zhang, Xin Lü, Lili Zhao, Yuxuan Song, Lei Zhang, Hao Jiang, Jiaying Zhang, Wupeng Ge

Novel protein sources for animal feed are needed, and the use of insects as feed ingredient is explored. The insect production sector offers opportunities for a circular and sustainable approach to feed production by upgrading waste or side streams into high-quality proteins. However, potential food or feed safety issues should be studied in advance.

Abstract

This study presents an analytical strategy named silica nanoparticles (Si-NP) based pipette tip solid phase extraction (PT-SPE) method for the trace level determination of cadmium in mineral water samples. Slotted quartz tube flame atomic absorption spectrophotometry (SQT-FAAS) was used to determine the cadmium analyte. Si-NPs synthesized from rice husk were used to preconcentrate/extract the cadmium ions.

Phenotypic heterogeneity within a bacterial population may confer new functionality and allow microorganisms to adapt to fluctuating environments. Previous work has suggested that Staphylococcus aureus could form small colony variants to avoid elimination by therapeutic antibiotics and host immunity systems. Here we show that a reversible non-pigment large colony morphology (Mu50∆lcpA-LC) was observed in S. aureus Mu50 after knocking out lcpA, coding for the LytR-CpsA-Psr family A protein.

Vibrio parahaemolyticus (Vp) is an aquatic Gram-negative bacterium that may infect humans and cause gastroenteritis and wound infections. The first pandemic of Vp associated infection was caused by the serovar O3:K6 and epidemics caused by the other serovars are increasingly reported. The two major virulence factors, thermostable direct hemolysin (TDH) and/or TDH-related hemolysin (TRH), are associated with hemolysis and cytotoxicity.

Rickettsia is the pathogen of Q fever, Brucella ovis is the pathogen of brucellosis, and both of them are Gram-negative bacteria which are parasitic in cells. The mixed infection of rickettsia and Brucella ovis is rarely reported in clinic. Early diagnosis and treatment are of great significance to the treatment and prognosis of brucellosis and Q fever. Here, we report a case of co-infection Rickettsia burneti and Brucella melitensis.

The recognition of a new yeast, Candida auris, in 2009 in East Asia, and its rapid global spread, was a reminder of the threats posed by multidrug-resistant fungal pathogens. C. auris had likely remained unrecognized for a long time as accurate tests were not available. The laboratory community responded to the C. auris challenge by publishing 35 new or revised diagnostic methods between 2014 and early 2021. The commercial sector also modified existing diagnostic devices. These C.

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants have been emerging and circulating globally since the start of the COVID-19 pandemic, of which B.1.617 lineage that was first reported in India at the end of 2020, soon became predominant. Tracing genomic variations and understanding their impact on the viral properties are the foundations for the vaccine and drug development and for the mitigation measures to be taken or lifted.

by Sarah Raymond, Amy L. W. Schwartz, Robert J. Thomas, Elizabeth Chadwick, Sarah E. Perkins

Author(s): Trung Quang Nguyen, Thanh-Thien Tran-Lam, Hoa Quynh Nguyen, Yen Hai Dao, Giang Truong Le

Author(s): Jie Guo, Yan Pu, Liqiao Zhong, Ke Wang, Xinbin Duan, Daqing Chen

Author(s): Lihan Wang, Xinyi Pang, Jiayuan Zhao, Haonan Jin, Xinyan Yang, Shiqian Fu, Shasha Cheng, Hongxuan Li, Chao Miao, Chaoxin Man, Yujun Jiang

The objectives of this study were to determine the effect of the milling degree (MD) of Oryza sativa L. (Korean rice) on the heating rate, pathogen inactivation (Salmonella Typhimurium and Staphylococcus aureus), and color change resulting from radio-frequency (RF) heating. Rice samples inoculated with pathogens were placed in a polypropylene jar and subjected to RF heating for 0-75 s.

Salmonella contamination in a dry processing facility frequently requires removal methods that are non-aqueous. Removal of pathogens from food processing systems with a purge of uncontaminated dry food materials has been proposed, however, little is known with the respect to efficacy. In this study, survival of Salmonella on inert contact surfaces and transfer of Salmonella from inert contact surfaces to low-moisture foods was evaluated.

Cold smoked salmon is a ready-to-eat seafood product of high commercial importance. The processing and storage steps facilitate the introduction, growth and persistence of foodborne pathogens and spoilage bacteria. The growth of commensal bacteria during storage and once the product is opened also influence the quality and safety of cold smoked salmon.

Combined steam-ultrasound process was investigated for decontamination of freshly slaughtered broilers. Combined steam-ultrasound was delivered simultaneously through specially designed nozzles. The nozzles were installed inside of a constructed machine that allowed for continuous processing.