scholarly journals Silver Nanoparticles against Foodborne Bacteria. Effects at Intestinal Level and Health Limitations

2020 ◽  
Vol 8 (1) ◽  
pp. 132 ◽  
Author(s):  
Irene Zorraquín-Peña ◽  
Carolina Cueva ◽  
Begoña Bartolomé ◽  
M. Victoria Moreno-Arribas
Keyword(s):  
Silver Nanoparticles ◽  
Foodborne Pathogens ◽  
Food Processing ◽  
Food Industry ◽  
Antimicrobial Agents ◽  
Current Knowledge ◽  
Dietary Exposure ◽  
Food Control ◽  
Ag Nps ◽  
The Impact

Foodborne diseases are one of the factors that endanger the health of consumers, especially in people at risk of exclusion and in developing countries. The continuing search for effective antimicrobials to be used in the food industry has resulted in the emergence of nanotechnology in this area. Silver nanoparticles (Ag-NPs) are the nanomaterial with the best antimicrobial activity and therefore, with great potential of application in food processing and packing. However, possible health effects must be properly addressed to ensure food safety. This review presents a detailed description on the main applications of Ag-NPs as antimicrobial agents for food control, as well as the current legislation concerning these materials. Current knowledge about the impact of the dietary exposure to Ag-NPs in human health with special emphasis on the changes that nanoparticles undergo after passing through the gastrointestinal tract and how they alter the oral and gut microbiota, is also summarized. It is concluded that given their potential and wide properties against foodborne pathogens, research in Ag-NPs is of great interest but is not exempt from difficulties that must be resolved in order to certify the safety of their use.

Antimicrobial potential of kombucha against foodborne pathogens

2021 ◽  
Vol 13 (3) ◽  
pp. 53-61
Author(s):  
Jie Hou ◽  
Rong Luo ◽  
Hui Ni ◽  
Ke Li ◽  
Fedrick C Mgomi ◽  
...  
Keyword(s):  
Foodborne Pathogens ◽  
Food Processing ◽  
Food Industry ◽  
Antimicrobial Agents ◽  
Microbial Flora ◽  
Chemical Compositions ◽  
Foodborne Illnesses ◽  
Food Borne ◽  
Alternative Approach ◽  
Potential Applications

The survival of foodborne pathogens under stressful food processing conditions and in host’s gastrointestinal tract has been widely reported to cause the outbreak of human diseases. Generally, antibiotics have been used to elimi-nate the microbial flora of foodborne pathogens. However, the overuse of antibiotics has contributed to the emergence and spread of multi-drug-resistant foodborne pathogens. Kombucha is a beverage prepared by fermenting sugared tea or other substrates with a symbiotic culture of yeasts and bacteria, and has been proved to fight food-borne pathogens and affect gastrointestinal microbial flora to prevent foodborne illnesses. In this context, this review primarily focused on microbiological and chemical compositions of kombucha obtained by fermenting different substrates. It further discussed the antimicrobial activity of kombucha, as well as potential antimicrobial agents found in kombucha, and the limitations of kombucha in the food industry. In addition, the need for developing antimicrobial agents from kombucha has been discussed for potential applications. The information provided in this review indicates that kombucha could serve as an alternative approach to control pathogens in place of using antibiotics.

scholarly journals Photocatalytic Activity of Revolutionary Galaxaura elongata, Turbinaria ornata, and Enteromorpha flexuosa’s Bio-Capped Silver Nanoparticles for Industrial Wastewater Treatment

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3241
Author(s):  
Manal N. Abdel Azeem ◽  
Safwat Hassaballa ◽  
Osama M. Ahmed ◽  
Khaled N. M. Elsayed ◽  
Mohamed Shaban
Keyword(s):  
Silver Nanoparticles ◽  
Wastewater Treatment ◽  
Organic Dyes ◽  
Exposure Period ◽  
Marine Macroalgae ◽  
Ag Nps ◽  
Turbinaria Ornata ◽  
Vis Spectroscopy ◽  
Safranine O ◽  
The Impact

More suitable wastewater treatment schemes need to be developed to get rid of harmful dyes and pigments before they are discharged, primarily from apparel and textile factories, into water bodies. Silver nanoparticles (Ag-NPs) are very effective, reductive nanocatalysts that can degrade many organic dyes. In this study, Ag-NPs are stabilized and capped with bioactive compounds such as Galaxaura elongata, Turbinaria ornata, and Enteromorpha flexuosa from marine macroalgae extracts to produce Ag[GE], Ag[TE], and Ag[EE] NPs. The reduction of Ag ions and the production of Ag[GE], Ag[TE], and Ag[EE] NPs have been substantiated by UV–Vis spectroscopy, SEM, EDX, and XRD tests. The NPs are sphere and crystalline shaped in nature with dimensions ranging from 20 to 25 nm. The biosynthesized Ag[GE], Ag[TE], Ag[EE] NPs were applied to photodegrade hazardous pigments such as methylene blue, Congo red, safranine O, and crystal violet under sunlight irradiation. In addition to the stability analysis, various experimental parameters, including dye concentration, exposure period, photocatalyst dose, and temperature, were optimized to achieve 100% photodegradation of the dyes. Moreover, the thermodynamic and kinetic parameters were calculated and the impact of scavengers on the photocatalytic mechanism was also investigated.

Understanding of food biofilms by the application of omics techniques

2021 ◽  
Author(s):  
Lei Yuan ◽  
Fedrick C Mgomi ◽  
Zhenbo Xu ◽  
Ni Wang ◽  
Guoqing He ◽  
...  
Keyword(s):  
Food Safety ◽  
Foodborne Pathogens ◽  
Food Processing ◽  
Biofilm Formation ◽  
Food Industry ◽  
Processing Conditions ◽  
Protective Barrier ◽  
And Control

Biofilms constitute a protective barrier for foodborne pathogens to survive under stressful food processing conditions. Therefore, studies into the development and control of biofilms by novel techniques are vital for the food industry. In recent years, foodomics techniques have been developed for biofilm studies, which contributed to a better understanding of biofilm behavior, physiology, composition, as well as their response to antibiofilm methods at different molecular levels including genes, RNA, proteins and metabolic metabolites. Throughout this review, the main studies where foodomics tools used to explore the mechanisms for biofilm formation, dispersal and elimination were reviewed. The data summarized from relevant studies are important to design novel and appropriate biofilm elimination methods for enhancing food safety at any point of food processing lines.

scholarly journals Silver Nanoparticles Induce a Triclosan-Like Antibacterial Action Mechanism in Multi-Drug Resistant Klebsiella pneumoniae

2021 ◽  
Vol 12 ◽  
Author(s):  
Vikram Pareek ◽  
Stéphanie Devineau ◽  
Sathesh K. Sivasankaran ◽  
Arpit Bhargava ◽  
Jitendra Panwar ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Silver Nanoparticles ◽  
Klebsiella Pneumoniae ◽  
Antimicrobial Agents ◽  
Transcriptional Analysis ◽  
Antibacterial Action ◽  
Resistant Bacteria ◽  
Drug Resistant ◽  
Action Mechanism ◽  
Ag Nps

Infections associated with antimicrobial-resistant bacteria now represent a significant threat to human health using conventional therapy, necessitating the development of alternate and more effective antibacterial compounds. Silver nanoparticles (Ag NPs) have been proposed as potential antimicrobial agents to combat infections. A complete understanding of their antimicrobial activity is required before these molecules can be used in therapy. Lysozyme coated Ag NPs were synthesized and characterized by TEM-EDS, XRD, UV-vis, FTIR spectroscopy, zeta potential, and oxidative potential assay. Biochemical assays and deep level transcriptional analysis using RNA sequencing were used to decipher how Ag NPs exert their antibacterial action against multi-drug resistant Klebsiella pneumoniae MGH78578. RNAseq data revealed that Ag NPs induced a triclosan-like bactericidal mechanism responsible for the inhibition of the type II fatty acid biosynthesis. Additionally, released Ag+ generated oxidative stress both extra- and intracellularly in K. pneumoniae. The data showed that triclosan-like activity and oxidative stress cumulatively underpinned the antibacterial activity of Ag NPs. This result was confirmed by the analysis of the bactericidal effect of Ag NPs against the isogenic K. pneumoniae MGH78578 ΔsoxS mutant, which exhibits a compromised oxidative stress response compared to the wild type. Silver nanoparticles induce a triclosan-like antibacterial action mechanism in multi-drug resistant K. pneumoniae. This study extends our understanding of anti-Klebsiella mechanisms associated with exposure to Ag NPs. This allowed us to model how bacteria might develop resistance against silver nanoparticles, should the latter be used in therapy.

scholarly journals Optimization of antimicrobial efficiency of silver nanoparticles against three oral microorganisms in irreversible hydrocolloid impressions

2021 ◽  
Author(s):  
Ahmad Jafari ◽  
Ramin Mazaheri Nezhad Fard ◽  
Sima Shahabi ◽  
Farid Abbasi ◽  
Golshid Javdani Shahedin ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Antimicrobial Agents ◽  
Diffusion Method ◽  
Ag Nps ◽  
Disk Diffusion Method ◽  
E Coli ◽  
Irreversible Hydrocolloid ◽  
Predicted Model ◽  
Water Ratio

Background and Objectives: Silver nanoparticles (Ag-NPs) are potent antimicrobial agents, which have recently been used in dentistry. The aim of the current study was to optimize antimicrobial activity of Ag-NPs used in preparing irre- versible hydrocolloid impressions against three microorganisms of Escherichia coli, Streptococcus mutans and Candida albicans. Materials and Methods: After assessing antimicrobial activity of the compound using disk diffusion method, three parame- ters of concentration of Ag-NPs (250-1000 ppm), ratio of hydrocolloid impression material powder to water (0.30-0.50) and time of mixing (20.0-60.0 s), affecting antimicrobial activity of irreversible hydrocolloid impression materials against the three microorganisms, were optimized. This combined process was successfully modeled and optimized using Box-Behnken design with response surface methodology (RSM). Decreases in colony number of E. coli, S. mutans and C. albicans were proposed as responses. Results: Qualitative antimicrobial assessments respectively showed average zone of inhibition (ZOI) of 3.7 mm for E. coli, 3.5 mm for S. mutans and 4 mm for C. albicans. For all responses, when the mixing duration and powder-to-water ratio increased, the circumstances (mixing duration of 59.38 s, powder-to-water ratio of 0.4 and Ag-NP concentration of 992 response) increased. Results showed that in optimum ppm, the proportion of decreases in colony numbers was maximum (89.03% for E. coli, 87.08% for S. mutans and 74.54% for C. albicans). Regression analysis illustrated a good fit of the ex- perimental data to the predicted model as high correlation coefficients validated that the predicted model was well fitted with data. Values of R2Adj with R2Pred were associated to the accuracy of this model in all responses. Conclusion: Disinfection efficiency dramatically increased with increasing of Ag-NP concentration, powder-to-water ratio and mixing time.

scholarly journals Application of Nanoparticles In Ensuring Food Safety

2020 ◽  
pp. 367-369
Author(s):  
T. Ganesh Kumar ◽  
P. Mahesh Reddy ◽  
C. V. Rajagopala Reddy
Keyword(s):  
Food Safety ◽  
Foodborne Pathogens ◽  
Food Processing ◽  
Food Industry ◽  
Food Packaging ◽  
Free Food ◽  
Food Microbiology ◽  
Life Extension ◽  
Food Science ◽  
Industry Applications

Recent innovations in nanotechnology have transformed a number of scientific and industrial areas including the food industry. Applications of nanotechnology have emerged with increasing need of nanoparticle uses in various fields of food science and food microbiology, including food processing, food packaging, functional food development, food safety, detection of foodborne pathogens, and shelf-life extension of food and/or food products. This review summarizes the potential of nanoparticles for their uses in the food industry in order to provide consumers a safe and contamination free food and to ensure the consumer acceptability of the food with enhanced functional properties.

scholarly journals Extracellular probiotic lipase capped silver nanoparticles as highly efficient broad spectrum antimicrobial agents

RSC Advances ◽  
2018 ◽  
Vol 8 (55) ◽  
pp. 31358-31365 ◽  
Author(s):  
Imran Khan ◽  
Nivetha Sivasankaran ◽  
Ravikiran Nagarjuna ◽  
Ramakrishnan Ganesan ◽  
Jayati Ray Dutta
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Broad Spectrum ◽  
Antimicrobial Agents ◽  
Ag Nps ◽  
Highly Efficient

A series of Ag NPs capped with different concentrations of probiotic lipase have been synthesized. The obtained Ag NPs exhibited efficient broad spectrum antimicrobial activity at concentrations much lower than the LC50values of zebrafish.

scholarly journals Silver nanoparticles impregnated with polyamide-66 to disinfect drinking water

2018 ◽  
Vol 13 (6) ◽  
pp. 1 ◽  
Author(s):  
Luciano André Deitos Koslowski ◽  
André Lourenço Nogueira ◽  
Silvana Licodiedoff ◽  
Adrieny Taliny Comper ◽  
Marilena Valadares Folgueras
Keyword(s):  
Silver Nanoparticles ◽  
Drinking Water ◽  
Polymer Matrix ◽  
Antimicrobial Agents ◽  
Silver Ions ◽  
Polymeric Matrix ◽  
Test Method ◽  
Concentration Limit ◽  
Polyamide 66 ◽  
The Impact

The importance of the preservation of water resources has resulted in the application of technologies such as nanostructured materials, which are able to minimize the impact associated with water contamination. This work evaluated the application of polyamide-66 (PA) pellets functionalized with silver nanoparticles (AgNPs) at polymer mass percentages of 0.05, 0.10 and 0.50% to disinfect of drinking water. Studies were carried out in three stages. The first stage was the synthesis of the silver nanoparticles by using silver nitrate as a metal precursor and sodium borohydrate as a reduction agent. The colloidal dispersion was characterized by UV-Vis spectrophotometry and transmission electron microscopy (MET). Afterwards, the nanostructures were incorporated into a polyamide-66 polymeric matrix. In the second stage, the silver ions leached from the polymer matrix in the water after a three-hour period were quantified in order to evaluate the limit established by Conama Resolution 357/2005, which imposes a concentration limit of 0.010 mg L-1. The best results were obtained with the application of 0.05% AgNPs in the polymeric matrix, yielding an average concentration of silver ions lixiviated of 0.008 mg L-1. The last step comprised the quantification of the antibacterial activity of the polymer matrix containing 0.05% of AgNPs against the microorganism E. coli using the Standard Test Method for Determining the Antimicrobial Agents Under Dynamic Contact Conditions. The samples containing 0.05% of AgNPs exhibited an antibacterial reduction of 97.89% after 24 h of incubation under stirring at room temperature (25°C).

scholarly journals Modelling the epidemiology of Escherichia coli ST131 and the impact of interventions on the community and healthcare centres

2016 ◽  
Vol 144 (9) ◽  
pp. 1974-1982 ◽  
Author(s):  
A. TALAMINOS ◽  
L. LÓPEZ-CERERO ◽  
J. CALVILLO ◽  
A. PASCUAL ◽  
L. M. ROA ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Antimicrobial Agents ◽  
Current Knowledge ◽  
Epidemiological Studies ◽  
Term Care ◽  
E Coli ◽  
Care Facilities ◽  
Potential Impact ◽  
The Impact

SUMMARYST131 Escherichia coli is an emergent clonal group that has achieved successful worldwide spread through a combination of virulence and antimicrobial resistance. Our aim was to develop a mathematical model, based on current knowledge of the epidemiology of ESBL-producing and non-ESBL-producing ST131 E. coli, to provide a framework enabling a better understanding of its spread within the community, in hospitals and long-term care facilities, and the potential impact of specific interventions on the rates of infection. A model belonging to the SEIS (Susceptible–Exposed–Infected–Susceptible) class of compartmental models, with specific modifications, was developed. Quantification of the model is based on the law of mass preservation, which helps determine the relationships between flows of individuals and different compartments. Quantification is deterministic or probabilistic depending on subpopulation size. The assumptions for the model are based on several developed epidemiological studies. Based on the assumptions of the model, an intervention capable of sustaining a 25% reduction in person-to-person transmission shows a significant reduction in the rate of infections caused by ST131; the impact is higher for non-ESBL-producing ST131 isolates than for ESBL producers. On the other hand, an isolated intervention reducing exposure to antimicrobial agents has much more limited impact on the rate of ST131 infection. Our results suggest that interventions achieving a continuous reduction in the transmission of ST131 in households, nursing homes and hospitals offer the best chance of reducing the burden of the infections caused by these isolates.

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