scholarly journals Bacteriophage-Derived Endolysins Applied as Potent Biocontrol Agents to Enhance Food Safety

2020 ◽  
Vol 8 (5) ◽  
pp. 724 ◽  
Author(s):  
Yoonjee Chang
Keyword(s):  
Food Safety ◽  
Food Preservation ◽  
Resistant Bacteria ◽  
Food Preservatives ◽  
Antibiotic Resistant ◽  
Cell Wall Binding ◽  
Cell Wall Binding Domain ◽  
Novel Strategy ◽  
Bacterial Peptidoglycan ◽  
Frequent Problem

Endolysins, bacteriophage-encoded enzymes, have emerged as antibacterial agents that can be actively applied in food processing systems as food preservatives to control pathogens and ultimately enhance food safety. Endolysins break down bacterial peptidoglycan structures at the terminal step of the phage reproduction cycle to enable phage progeny release. In particular, endolysin treatment is a novel strategy for controlling antibiotic-resistant bacteria, which are a severe and increasingly frequent problem in the food industry. In addition, endolysins can eliminate biofilms on the surfaces of utensils. Furthermore, the cell wall-binding domain of endolysins can be used as a tool for rapidly detecting pathogens. Research to extend the use of endolysins toward Gram-negative bacteria is now being extensively conducted. This review summarizes the trends in endolysin research to date and discusses the future applications of these enzymes as novel food preservation tools in the field of food safety.

scholarly journals Prevalence and Characterization of Extended-Spectrum β-Lactamase-Producing Antibiotic-Resistant Escherichia coli and Klebsiella pneumoniae in Ready-to-Eat Street Foods

Antibiotics ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 850
Author(s):  
Shobha Giri ◽  
Vaishnavi Kudva ◽  
Kalidas Shetty ◽  
Veena Shetty
Keyword(s):  
Escherichia Coli ◽  
Food Safety ◽  
Klebsiella Pneumoniae ◽  
Rural Areas ◽  
Significant Risk ◽  
Microbiological Quality ◽  
Resistant Bacteria ◽  
Antibiotic Resistant ◽  
E Coli ◽  
Extended Spectrum

As the global urban populations increase with rapid migration from rural areas, ready-to-eat (RTE) street foods are posing food safety challenges where street foods are prepared with less structured food safety guidelines in small and roadside outlets. The increased presence of extended-spectrum-β-lactamase (ESBL) producing bacteria in street foods is a significant risk for human health because of its epidemiological significance. Escherichia coli and Klebsiella pneumoniae have become important and dangerous foodborne pathogens globally for their relevance to antibiotic resistance. The present study was undertaken to evaluate the potential burden of antibiotic-resistant E. coli and K. pneumoniae contaminating RTE street foods and to assess the microbiological quality of foods in a typical emerging and growing urban suburb of India where RTE street foods are rapidly establishing with public health implications. A total of 100 RTE food samples were collected of which, 22.88% were E. coli and 27.12% K. pneumoniae. The prevalence of ESBL-producing E. coli and K. pneumoniae was 25.42%, isolated mostly from chutneys, salads, paani puri, and chicken. Antimicrobial resistance was observed towards cefepime (72.9%), imipenem (55.9%), cefotaxime (52.5%), and meropenem (16.9%) with 86.44% of the isolates with MAR index above 0.22. Among β-lactamase encoding genes, blaTEM (40.68%) was the most prevalent followed by blaCTX (32.20%) and blaSHV (10.17%). blaNDM gene was detected in 20.34% of the isolates. This study indicated that contaminated RTE street foods present health risks to consumers and there is a high potential of transferring multi-drug-resistant bacteria from foods to humans and from person to person as pathogens or as commensal residents of the human gut leading to challenges for subsequent therapeutic treatments.

scholarly journals Bacteriocins as a new generation of antimicrobials: toxicity aspects and regulations

2020 ◽  
Author(s):  
Samira Soltani ◽  
Riadh Hammami ◽  
Paul D Cotter ◽  
Sylvie Rebuffat ◽  
Laila Ben Said ◽  
...  
Keyword(s):  
Regulatory Agencies ◽  
Resistant Bacteria ◽  
Antibiotic Resistant Bacteria ◽  
Food Preservatives ◽  
Food Preservative ◽  
Antibiotic Resistant ◽  
Spectrum Activity ◽  
Recent Trends ◽  
Global Threat ◽  
New Generation

ABSTRACT In recent decades, bacteriocins have received substantial attention as antimicrobial compounds. Although bacteriocins have been predominantly exploited as food preservatives, they are now receiving increased attention as potential clinical antimicrobials and as possible immune-modulating agents. Infections caused by antibiotic-resistant bacteria have been declared as a global threat to public health. Bacteriocins represent a potential solution to this worldwide threat due to their broad- or narrow-spectrum activity against antibiotic-resistant bacteria. Notably, despite their role in food safety as natural alternatives to chemical preservatives, nisin remains the only bacteriocin legally approved by regulatory agencies as a food preservative. Moreover, insufficient data on the safety and toxicity of bacteriocins represent a barrier against the more widespread use of bacteriocins by the food and medical industry. Here, we focus on the most recent trends relating to the application of bacteriocins, their toxicity and impacts.

scholarly journals In VitroCharacterization of PlySK1249, a Novel Phage Lysin, and Assessment of Its Antibacterial Activity in a Mouse Model of Streptococcus agalactiae Bacteremia

2013 ◽  
Vol 57 (12) ◽  
pp. 6276-6283 ◽  
Author(s):  
Frank Oechslin ◽  
Jean Daraspe ◽  
Marlyse Giddey ◽  
Philippe Moreillon ◽  
Grégory Resch
Keyword(s):  
Mouse Model ◽  
Streptococcus Agalactiae ◽  
Content Type ◽  
Cell Wall Binding ◽  
Gene Coding ◽  
Invasive Infections ◽  
Cell Wall Binding Domain ◽  
Bacterial Peptidoglycan

ABSTRACTBeta-hemolyticStreptococcus agalactiaeis the leading cause of bacteremia and invasive infections. These diseases are treated with β-lactams or macrolides, but the emergence of less susceptible and even fully resistant strains is a cause for concern. New bacteriophage lysins could be promising alternatives against such organisms. They hydrolyze the bacterial peptidoglycan at the end of the phage cycle, in order to release the phage progeny. By using a bioinformatic approach to screen several beta-hemolytic streptococci, a gene coding for a lysin was identified on a prophage carried byStreptococcus dysgalactiaesubsp.equisimilisSK1249. The gene product, named PlySK1249, harbored an original three-domain structure with a central cell wall-binding domain surrounded by an N-terminal amidase and a C-terminal CHAP domain. Purified PlySK1249 was highly lytic and bactericidal forS. dysgalactiae(2-log10CFU/ml decrease within 15 min). Moreover, it also efficiently killedS. agalactiae(1.5-log10CFU/ml decrease within 15 min) but not several streptococcal commensal species. We further investigated the activity of PlySK1249 in a mouse model ofS. agalactiaebacteremia. Eighty percent of the animals (n= 10) challenged intraperitoneally with 106CFU ofS. agalactiaedied within 72 h, whereas repeated injections of PlySK1249 (45 mg/kg 3 times within 24 h) significantly protected the mice (P< 0.01). Thus, PlySK1249, which was isolated fromS. dysgalactiae, demonstrated high cross-lytic activity againstS. agalactiaebothin vitroandin vivo. These encouraging results indicated that PlySK1249 might represent a good candidate to be developed as a new enzybiotic for the treatment of systemicS. agalactiaeinfections.

scholarly journals Silver Nanoparticle-Based Nanocomposites for Combating Infectious Pathogens: Recent Advances and Future Prospects

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 581
Author(s):  
Md A. Wahab ◽  
Luming Li ◽  
Hongmei Li ◽  
Ahmed Abdala
Keyword(s):  
Biomedical Applications ◽  
Antibacterial Agents ◽  
Structural Parameters ◽  
Antibacterial Activities ◽  
Food Preservation ◽  
Resistant Bacteria ◽  
Ag Nps ◽  
Antibiotic Resistant ◽  
The Impact ◽  
Careful Investigation

Silver nanoparticles (Ag NPs) and their nanocomposites with polymers are potent agents for antibacterial and disinfectant applications. The structural parameters of Ag-NPs, such as size, shape, and surface area, are very critical for developing appropriate formulations for the targeted applications. The impact of these factors on the performance of Ag NPs is analyzed. Ag NPs with a broad spectrum of antibacterial activities have already found applications in wound and burn dressing, food preservation, agricultural ponds, treatment for infected areas, coatings, water treatment, and other biomedical applications. Ag NPs are quite useful against antibiotic-resistant bacteria, but their level of toxicity needs careful investigation as their toxicity could be very harmful to human health and the environment. This review discusses the challenges and prospects of various Ag NPs and their composites. The review will enrich the knowledge about the efficiency and mechanism of various Ag nanoparticle-based antibacterial agents.

Study of the interactions between endolysin and bacterial peptidoglycan on S. aureus by dynamic force spectroscopy

Nanoscale ◽  
2015 ◽  
Vol 7 (37) ◽  
pp. 15245-15250 ◽  
Author(s):  
Jianli Liu ◽  
Xuejie Zhang ◽  
Hang Yang ◽  
Jinghe Yuan ◽  
Hongping Wei ◽  
...  
Keyword(s):  
Cell Wall ◽  
Bacterial Pathogen ◽  
Force Spectroscopy ◽  
Binding Domain ◽  
Dynamic Force ◽  
Dynamic Force Spectroscopy ◽  
Binding Strength ◽  
Cell Wall Binding ◽  
Cell Wall Binding Domain ◽  
Bacterial Peptidoglycan

The cell wall binding domain (CBD) of bacteriophage lysins can bind to host bacteria with comparable binding strength as antibody, demonstrating it is a promising new probe to detect the corresponding bacterial pathogen.

scholarly journals Potential Application of Phage ɸ11 Lytic Proteins in Rapid Detection and Elimination of Staphylococcus aureus

2021 ◽  
Vol 10 (10) ◽  
pp. 142-155
Author(s):  
Amenti Rajkrishna Mondal
Keyword(s):  
Staphylococcus Aureus ◽  
Peptidoglycan Hydrolase ◽  
Antibiotic Resistant ◽  
Promising Alternative ◽  
Catalytic Domains ◽  
Cell Wall Binding ◽  
C Terminus ◽  
A Cell ◽  
Cell Wall Binding Domain ◽  
Potential Antimicrobial Activity

The increasing antibiotic resistance conferred by Staphylococcus aureus to multiple potential antibiotics has become a serious issue of concern and threat to mankind worldwide. In light of this, phage lytic proteins have been reported which show potential antimicrobial activity against pathogenic microorganisms that could be a promising alternative to antibiotics to eradicate the antibiotic resistant problems. This review discusses the various applications of S. aureus phage lytic proteins and the potentiality of aureophage phi 11 endolysin and virion associated peptidoglycan hydrolase (VAPGH) against staphylococcus strains. Phage Phi11 endolysin harbors two enzymatically active domain; cysteine and histidine-dependent amidohydrolase/peptidase (CHAP) and Amidase 2 at the N-terminus and a cell wall binding domain (CBD) SH3 5 at the C-terminus, while virion associated peptidoglycan hydrolase (VAPGH) has two catalytic domains, CHAP and Glucosaminidase (Mannosyl-glycoprotein endo-beta-N-acetylglucosaminidase) at its N-terminal and C-terminal, respectively.

scholarly journals Antimicrobial-Resistant Pathogens in Food Handlers Serving in Mass Catering Centers

2020 ◽  
Author(s):  
Chalachew Yenew ◽  
Fitalew Tadele
Keyword(s):  
Food Safety ◽  
Work Experience ◽  
Diffusion Method ◽  
Resistant Bacteria ◽  
Antibiotics Resistance ◽  
Food Handlers ◽  
Antibiotic Resistant Bacteria ◽  
Antibiotic Resistant ◽  
Foodborne Bacteria ◽  
Microbiological Methods

Abstract BackgroundThe prevalence of antimicrobial-resistant pathogens, including foodborne antibiotic-resistant bacteria, is ever increasing. An increase in antimicrobial resistance results in treatment failure and outbreaks. Mass food serving institutions are at a high risk of outbreaks due to the probability of mass infection.ObjectiveThis study aims to determine the contamination of food handlers with antibiotic-resistant bacteria and its associated factors at Debre Tabor University cafeteria.MethodsA laboratory-based cross-sectional study was conducted by following standard microbiological methods to isolate and identify foodborne bacteria from the hands of food handlers. The Kirby-Bauer disc diffusion method was used for perform the resistance profiles of the foodborne bacteria that were identified from the hands of the food in March 2020. Thirty samples each from hand and food utensil swabs were collected. Besides, work experience, drug use characteristics, and educational status of the food handler’s data were collected by using an observational checklist and interview questions. Descriptive statistics, correlation, and linear regressions were used to analyze the data.ResultsThe result shows the contamination of food handlers with varying pathogenic microbial organisms. The food handlers were mostly contaminated with multiple antibiotics-resistance (MAR) of Escherichia coli 43% (95% CI: 41.2%, 46.9%), Salmonella 36.7% (95% CI:33.2%, 38.7%), and Shigella 20% (95% CI: 19.2%, 26.9%). The study identifies poor personnel hygiene, lack of food safety training, and lack of sufficient food safety knowledge of the food handlers.ConclusionsThe contamination of food handlers with antimicrobial-resistant microbes at the university cafeteria could indicate the likelihood of the occurrence of foodborne outbreaks. Hence, continuous awareness creation and strict supervision were preventing the contamination of the food and related consequences.

The comparative study among the MRSAcin, Nisin A and vancomycin, on biofilm formation by Methicillin resistance Staphylococcus aureus isolated from food sources.

2019 ◽  
Vol 9 (o3) ◽  
Author(s):  
¹Hind H. Muunim ◽  
Muna T Al-Mossawei ◽  
Mais Emad Ahmed
Keyword(s):  
Biofilm Formation ◽  
Methicillin Resistance ◽  
Microbial Control ◽  
Antibiotic Sensitivity ◽  
Raw Milk ◽  
Sensitivity Test ◽  
Food Sources ◽  
Resistant Bacteria ◽  
Biochemical Tests ◽  
Food Preservatives

Biofilms formation by pathogens microbial Control considered important in medical research because it is the hazarded virulence factor leading to becoming difficult to treat because of its high resistance to antimicrobials. Glycopeptide antibiotic a (Vancomycin) and the commercial bacteriocin (Nisin A) were used to comparative with purification bacteriocin (MRSAcin) against MRSA biofilm. One hundred food samples were collected from Baghdad markets from July 2016 to September 2016, including (cheese, yogurt, raw milk, fried meat, grilled meat, and beef burger). All samples were cultures; S. aureus was confirmation by macroscopic culture and microscopic examination, in addition to biochemical tests. Methicillin resistance S. asureus (MRSA) were identification by antibiotic sensitivity test (AST), Vitek 2 system. The result shown the 60(60%) isolate were identified as S. aureus and 45(75%) gave positive result as MRSA isolate, M13 isolate was chosen as MRSA isolates highest biofilm formation for treatment with MRSAcin, Nisin A(bacteriocin) and Vancomycin (antibiotic) to compared the more antimicrobial have bacteriocidal effect. The sensitivity test uses to determine the effect of MRSAcin, Nisin A, and Vancomycin MIC on MRSA planktonic cell by (WDA). The new study shows the impacts of new kind Pure Bacteriocins (MRSAcin) from methicillin-resistant S. aureus (MRSA) highly effects then (Vancomycin and Nisin A) at different concentration. In a current study aimed to suggest new Bacteriocin is potent highly for the treatment of resistant bacteria biofilm infections in food preservatives

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