Spectroscopic and antibacterial study of biochemically-derived silver nanoparticles

Publication date: 2019Source: Materials Today: Proceedings, Volume 19, Part 1Author(s): Α. Ntolia, N. Matisioudis, E. Triantafillou, G. Evangelopoulou, V. Karachristou, E. Rizos, T. Karamanidou, A. Tsouknidas, D. Papadopoulos, D. Tsipas, N. Michailidis, A. AggeliAbstractSilver nanoparticles (AgNPs) constitute a promising approach for the development of new antimicrobial systems. The major global concern about the emergence of bacterial strains resistant to widely used therapeutic agents for human infections has increased research for the discovery of new antimicrobial compounds as therapeutic alternatives. The aim of the present study was a preliminary investigation of the spectroscopic properties and inhibitory activity of silver nanoparticles on four reference gram negative and gram positive bacterial strains: Salmonella Typhimurium, Escherichia coli, Listeria monocytogenes and Staphylococcus aureus, at two different concentrations (103 and 106 cfu/ml) using cultivation media. The results confirmed that AgNPs absorb light in the visible area of the electromagnetic spectrum, as a fairly dominant and sharp peak appears at around 425 nm wavelength. These nanomaterials are shown here to be very effective antibacterial agents in both pathogen (Listeria, Salmonella) and non-pathogens (E.coli, Staphylococcus) microorganisms; furthermore the present study proves their efficacy against both Gram positive (Staphylococcus, Listeria) and Gram negative (E.coli, Salmonella) bacteri...
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research

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In conclusion, SCLP was a potential natural antimicrobial substance with strong antimicrobial activity, which may reduce the use of antibiotics or combat drug-resistant bacteria through synergistic combination with antibiotics. PMID: 31637496 [PubMed - as supplied by publisher]
Source: Applied Microbiology and Biotechnology - Category: Microbiology Authors: Tags: Appl Microbiol Biotechnol Source Type: research
This study was conducted to determine the efficacy of UV-C irradiation for safety and quality of dried bay leaves. Cocktails of microorganisms of the same species were prepared and inoculated onto the leaves, which were thereafter subjected to UV-C irradiation. Results showed that all tested organisms, which included Escherichia coli O157:H7, Salmonella enterica, Pseudomonas aeruginosa, Listeria monocytogenes, and Staphylococcus aureus, exhibited inactivation behaviors in the irradiated leaves that are characterized by initial log-linear population decline, followed by inactivation tail. The Total Log Reductions in the org...
Source: LWT Food Science and Technology - Category: Food Science Source Type: research
Publication date: Available online 18 September 2019Source: Food BioscienceAuthor(s): Sarengaowa, Wenzhong Hu, Ke Feng, Zhilong Xiu, Aili Jiang, Ying LaoAbstractFresh-cut cantaloupe (Cucumis melo L.) is a popular food. However, the presence of foodborne pathogen on the cut surfaces leads to both spoilage and food poisoning of fresh-cut cantaloupe. The antibacterial effectiveness of an alginate-based edible coating (EC) containing thyme oil was evaluated against foodborne pathogens on fresh-cut cantaloupe samples. Cantaloupe samples were treated with alginate-based EC and alginate-based EC containing different concentration...
Source: Food Bioscience - Category: Food Science Source Type: research
Publication date: Available online 12 August 2019Source: LWTAuthor(s): Saritha Gopal Pandit, Krishna-Prashanth Ramesh Mekala, Mohankumari H. Puttananjaiah, Mohan Appasaheb DhaleAbstractFungus producing red pigment was identified as Talaromyces purpureogenus CFRM02. Agriculture by-product, bengal gram husk (BegH) was used as substrate for fermentation. Red pigment characteristics were confirmed by CIELAB and UV–vis spectrum. T. purpureogenus CFRM02 produced 0.565 Absorption Unit-AU mL−1 of red pigment. Addition of peptone, glucose and trace elements to culture medium significantly improved (≈4 fold) the pi...
Source: LWT Food Science and Technology - Category: Food Science Source Type: research
In this study, a method was developed to encapsulated carvacrol in nanofibers from soluble potato starch. The carvacrol was added in starch solutions at various concentrations (0, 20, 30 and 40% v/v) and electrospun into fibers. The morphology, size distribution, thermal stability, FT-IR spectra, relative crystallinity (RC) and antioxidant of the electrospun fibers were analyzed. For mechanical properties and antimicrobial activities evaluation electrospun nonwovens were obtain. The carvacrol-loaded nanofibers showed homogeneous morphology and average diameters ranging from 73 to 95 nm. The carvacrol encapsulated in the ...
Source: International Journal of Biological Macromolecules - Category: Biochemistry Authors: Tags: Int J Biol Macromol Source Type: research
The goal of this study was to isolate, screen, and characterize Arctic microbial isolates from Expedition Fjord, Axel Heiberg Island, Nunavut, Canada capable of inhibiting the growth of foodborne and clinically relevant pathogens. Arctic bacteria were isolated from twelve different high Arctic habitats pertaining to active layer permafrost soil, saline spring sediments, lake sediments, and endoliths. This was achieved using (1) the cryo-iPlate, an innovative in situ cultivation device within active layer permafrost soil and (2) bulk plating of Arctic samples by undergraduate students that applied standard culturing. To mit...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
In conclusion, methyl gallate (1) and gallic acid (2) are the compounds responsible for the antibacterial activity of Caesalpinia coriaria fruit.Graphical abstract
Source: Microbial Pathogenesis - Category: Infectious Diseases Source Type: research
This study gives insights to design new fiber-based antimicrobial nanomaterials of interest in food packaging exploits.Graphical abstract
Source: Carbohydrate Polymers - Category: Biomedical Science Source Type: research
This study aimed to develop novel multifunctional soy protein-based packaging materials with the incorporation of cellulose nanofibril (CNF), Cedrus deodara pine needle extract (PNE), and lactic acid. The effects of the loaded components on the physical and functional properties of nanocomposites were evaluated. Results indicate that the incorporation of CNF into the composite enhanced its tensile strength due to the filling effects of CNF. The addition of CNF and PNE greatly enhanced the light barrier property of films. Moreover, the films containing PNE displayed strong antioxidant activity and significantly improved ant...
Source: Food Packaging and Shelf Life - Category: Food Science Source Type: research
Publication date: Available online 17 July 2019Source: LWTAuthor(s): Jeong Hyeon Lee, Kyung Bin Song, Eun Ji Choi, Hong Kyeong Kim, Hae Woong Park, Ho Hyun ChunAbstractWe evaluated the efficiency of high hydrostatic pressure (HHP, 100–600 MPa) and 5% red ginseng concentrate (RGC) supplementation in inactivating foodborne pathogens and the impacts of treatment on the quality of kimchi sauce. Listeria monocytogenes and Staphylococcus aureus decreased by 4.02 log CFU/g with increasing HHP intensity, in kimchi sauces supplemented with or without RGC. In addition, Escherichia coli O157:H7 and Salmonella Typhimurium decr...
Source: LWT Food Science and Technology - Category: Food Science Source Type: research
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