Research Publications (Food Safety)

Consumers are becoming vegan, vegetarian, or flexitarian due to the factors such as a healthy lifestyle, and growing environmental concerns. Circumstances like this have cumulatively driven the global nuts and dried fruits market. Thereby, this study aims to review two nuts (almond and cashew nut) in terms of processing effect on their quality attributes, nutritional value, phytochemical composition, and significant health advantages.

Salmonellosis is one of the most common foodborne diseases worldwide. Surface adherence and biofilm formation are among the main strategies evolved by Salmonella to survive under harsh conditions and are risk factors for its spread through the food chain. Owing to the increase in antimicrobial resistance, there is a growing need to develop other methods to control foodborne pathogens, and bacteriophages have been suggested as a potential alternative for this purpose.

by Eamon Gibbons, Mehbooba Tamanna, Bobby J. Cherayil Salmonella enterica serovars Typhimurium and Typhi are enteropathogens that differ in host range and the diseases that they cause. We found that exposure to a combination of hypotonicity and the detergent Triton X-100 significantly reduced the viability of the S. Typhi strain Ty2 but had no effect on the S. Typhimurium strain SL1344.

This study evaluated the effectiveness of triplewashing with a hydrogen peroxide (H2O2)-peroxyacetic acid (PAA) mixer to mitigate microbial cross-contamination of Salmonella Typhimurium and the surrogate bacteria Enterococcus faecium on butternut squash. To produce cross-contamination, one or two butternut squash were dip-inoculated with nalidixic acid-resistant S. Typhimurium (4.03 log10MPN/g) or E.

Proteus mirabilis is an opportunistic pathogen frequently associated with nosocomial infection and food poisoning cases. Contamination of P. mirabilis in retail meat products may be important transmission routes for human infection with P. mirabilis. In this study a total of 89 P. mirabilis strains were isolated from 347 samples in 14 food markets in China and subjected to whole-genome sequencing.

Lysin EN4 is a peptidoglycan-degrading enzyme. Like other lysins against Gram-negative bacteria, EN4 requires cell-wall destabilizing agents, such as ethylenediamine tetraacetic acid (EDTA) to facilitate it to the peptidoglycan layer. This study aimed to use EN4 in reducing Salmonella in chilled and thawed raw chicken meat. However, the use of EDTA is limited to some types of foods. An alternative to EDTA was explored.

Introduction Use of antimicrobial drugs (AMDs) in food producing animals has received increasing scrutiny because of concerns about antimicrobial resistance (AMR) that might affect consumers. Previously, investigations regarding AMR have focused largely on phenotypes of selected pathogens and indicator bacteria, such as Salmonella enterica or Escherichia coli. However, genes conferring AMR are known to be distributed and shared throughout microbial communities.

This study focused on the microencapsulation of enterocin from Enterococcus durans (E. durans MF5) in whey powder (WP) using a spray-drying technique followed by the evaluation of how complexation can preserve the enterocin structure and antimicrobial activity against food-borne pathogens. Crude enterocin samples (1 and 5%) were microencapsulated in 10% WP.

Background. Raw milk is usually contaminated with pathogenic bacteria. Fermentation of milk is important to inhibit the growth of contaminants, spoilage, and pathogenic bacteria. The objective of this study was to isolate lactic acid bacteria from fermented milk and evaluate their antimicrobial activity against selected pathogenic bacteria. Methods.

Salmonella enterica serovar Typhimurium (S. Typhimurium) is a zoonotic pathogen that causes severe gastroenteritis. The 5′-nucleotidases of pathogens can dephosphorylate adenosine phosphates, boost adenosine levels and suppress the pro-inflammatory immune response. In our previous study, an extracellular nuclease, 5′-nucleotidase, was identified in the extracellular proteins of S. Typhimurium.

Previous studies indicated that the use of a phage cocktail, composed of bacteriophages vB_SenM-2 and vB_Sen-TO17, is effective in killing cells of Salmonella enterica serovars Typhimurium and Enteritidis in vitro and in the Galleria mellonella animal model as efficiently as antibiotics (enrofloxacin or colistin) and induced fewer deleterious changes in immune responses.

Fresh vegetables are closely associated with foodborne disease outbreaks; however, systematic analysis of the microbiological quality of fresh vegetables and molecular information on foodborne pathogens in fresh produce are poorly reported in China.

Rapid and sensitive quantitative detection methods are required to monitor and detect Salmonella throughout the food supply chain and early prevention of foodborne disease outbreaks. In this study, a magnetic microbead enzyme-linked immunoassay (MELISA) based on phage receptor binding protein was developed for rapid enrichment and detection of Salmonella in complex food matrices.

In this study, transcriptional level gene expression changes in biofilm forms of Salmonella Typhimurium ATCC 14028 and its dam mutant were investigated by performing RNAseq analysis. As a result of these analyzes, a total of 233 differentially expressed genes (DEGs) were identified in the dam mutant, of which 145 genes were downregulated and 88 genes were upregulated compared to the wild type.

The topic of bacteriophage as an alternative to antibiotics to control pathogenic bacteria has attracted attention. Here, a novel virulent Salmonella bacteriophage JNwz02 capable of cross-infecting E. coli O157:H7 was isolated and characterized. The complete genome of JNwz02 was composed of 114390 bp double-stranded DNA molecules encoding 164 open reading frames (ORFs) with a G + C content of 40.22%.

Nisin, a bacteriocin widely used in the food industry, and curcumin, the yellow pigment extracted from turmeric (Curcuma longa L.) stand out among the numerous natural preservatives that have antimicrobial activity. The conversion of these compounds into nanoparticles could be interesting as an alternative to improve technological aspects (such as the low water solubility of curcumin) and to evaluate how synergism could take place in the case of co-encapsulation.

Sensitive and specific detection of Salmonella is highly desirable to guarantee food safety and prevent food-borne disease outbreaks. Herein, we proposed a ratiometric electrochemical biosensor based on the combination of SRCA and CRISPR/Cas12a system for ultrasensitive and specific detection of Salmonella. Signal amplification is accomplished by reasonably integrating rapid SRCA amplification and the trans-cleavage capabilities of Cas12a.

Background Salmonella are pathogenic foodborne bacteria with complex pathogenicity from numerous virulence genes housed in Salmonella pathogenicity islands (SPIs), plasmids, and other gene cassettes. However, Salmonella virulence gene distributions and mechanisms remain unestablished.

Zoonotic Salmonella infection is a critical and challenging issue for public health. Since human infections are mainly associated with consuming contaminated chicken products, strategies to reduce Salmonella carriage and shedding are essential.

Food safety and health are the themes of today's society. As a class of foodborne pathogens, Salmonella enteritidis has become one of the common zoonotic pathogens. Because chemical preservatives have certain harmfulness and have been questioned, it is particularly important to find green and safe natural preservatives. The advantages of plant essential oils (EOs) are that they are green and safe, have a wide range of antibacterials, and are not easy to form drug resistance.

This study investigated the antimicrobial and antibiofilm efficacy of separate and combined treatments of Lactobacillus curvatus B67-produced postbiotic and the polyphenolic flavanol quercetin against Listeria monocytogenes and Salmonella enterica ser. Typhimurium. The antimicrobial potentiality of the postbiotic was chiefly associated with organic acids (e.g., lactic and acetic acids).

This study was designed to evaluate the adaptive resistance of Salmonella Typhimurium under continuous sublethal selective pressure. Salmonella Typhimurium ATCC 19585 (STATCC) and S. Typhimurium CCARM 8009 (STCCARM) were sequentially cultured for 3 days at 37 °C in trypticase soy broth containing 1/2 × MICs of cefotaxime (CEF1/2), chloramphenicol (CHL1/2), gentamicin (GEN1/2), and polymyxin B (POL1/2).

Cooked battered products like nuggets and sausages are famous street foods in Malaysia. However, these foods lack prevalence data for the non-typhoidal Salmonella enterica serovars Enteritidis and Typhimurium (NTS) contaminations, thus leading to concern over foodborne outbreaks. Therefore, the present work aimed to examine the prevalence of antibiotic-resistant NTS in battered foods, and investigate their survival under simulated gastric fluid (SGF) and microwave heating.

A colorimetric biosensor based on a novel metal-organic framework (MOF) composed of Zirconium (Zr) and Praseodymium (Pr) is presented as a nanozyme to detect Salmonella Typhimurium (S. typhimurium). The ZrPr-MOF poses extreme peroxidase-mimic activity, and it interacts with an aptamer. In the presence of hydrogen peroxide (H2O2), the intense blue color is observed via the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by ZrPr-MOF.

Geraniol nanoemulsions (G-NE) based on Tween 80 and medium chain triglyceride (MCT) as surfactant and co-surfactant, respectively, has been prepared by the spontaneous emulsification method. Its physical and chemical properties such as mean particle size, zeta potential, PDI, pH, viscosity, contact angle, appearance morphology, and stability (storage stability, thermal stability, centrifugal properties, acid-base stability, and freeze-thaw properties) of the droplet were analyzed.