Non-covalent functionalization of graphene oxide using self-assembly of silver-triphenylphosphine for bactericidal formulations

Publication date: 1 March 2020Source: Materials Chemistry and Physics, Volume 243Author(s): Samir Bouchareb, Rachida Doufnoune, Farid Riahi, Hafsa Cherif-Silini, Lassaad BelbahriAbstractGO-Ag nanohybrids have attracted tremendous attention thanks to their several potential properties. In this research work, a new approach was adopted, where Triphenylphosphine (PPh3) was used as a linkage to decorate the surface of Graphene oxide (GO) nanosheets by Silver nanoparticles (AgNPs) via a simple method. The Fourier transform infrared spectroscopy (FTIR), Ultraviolet–visible spectroscopy (UV–Vis), X-ray diffraction analysis (XRD), Raman spectroscopy, Thermo-gravimetric analysis (TGA), X-ray fluorescence (XRF), Zeta potential analysis, Scanning electron microscopy (SEM), and Atomic force microscopy (AFM) techniques were used to reveal that AgNPs have covered the surface of GO sheets through non covalent and permanent bonding, altering new structural and electronic properties, leading to the appearance of the oxidative stress phenomenon, which considered as a key step of the antibacterial mechanism of this kind of hybrids, causing death of both Gram-positive (Bacillus subtilis, Enterococcus faecalis, Methicillin-resistant Staphylococcus aureus - MRSA, and Staphylococcus aureus) and Gram-negative (Escherichia coli, Serratia marcescens, Shigella sp, Salmonella sp, Serratia microorganisms liquefaciens, Proteus sp, Enterobacter cloacae and Pseudomonas aeruginosa).Graphical abst...
Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research

Related Links:

Authors: Reissier S, Cattoir V Abstract INTRODUCTION: Streptogramins (pristinamycin and quinupristin-dalfopristin) can be interesting options for the treatment of infections due to Gram-positive cocci, especially multidrug-resistant isolates. AREAS COVERED: This review provides an updated overview on structural and activity characteristics, mechanisms of action and resistance, pharmacokinetic/pharmacodynamic and clinical use of streptogramins. EXPERT OPINION: The streptogramin antibiotics act by inhibition of the bacterial protein synthesis. They are composed of two chemically distinct compounds, namely typ...
Source: Expert Review of Anti-Infective Therapy - Category: Infectious Diseases Tags: Expert Rev Anti Infect Ther Source Type: research
CONCLUSIONS: Xyloglucan/gelose plus ORS was effective and safe in treating acute diarrhea in children. PMID: 33028102 [PubMed - as supplied by publisher]
Source: Expert Review of Gastroenterology and Hepatology - Category: Gastroenterology Tags: Expert Rev Gastroenterol Hepatol Source Type: research
CONCLUSIONS: Immunohistochemistry seems to be a promising option not only in clinical recognition, but also in the selection and monitoring of treatment effects. However, these methods have not yet recommended for routine clinical use. PMID: 33032462 [PubMed - as supplied by publisher]
Source: Scandinavian Journal of Gastroenterology - Category: Gastroenterology Tags: Scand J Gastroenterol Source Type: research
Conclusions: (1) Data at our center suggests at least a regional implementation gap in GBS screening and IAP. (2) The decline in the resistance rate ofE. coli for all antimicrobial substances might indicate that the reduction of prenatal antibiotics use is beneficial and that neonatal antibiotic stewardship programs should include pregnant women as well.What is Known:• GBS screening and intrapartum antibiotic prophylaxis led to a 32%-reduction in GBS disease in Germany with a 0.75 (92:122) ratio of early-onset disease to late-onset disease in 2009–2010.• Prenatal antibiotic use might increase the risk of E....
Source: European Journal of Pediatrics - Category: Pediatrics Source Type: research
CONCLUSIONS: Paramagnetic rims might be a characteristic MRI finding for MS, and therefore they have potential as an imaging marker for differentially diagnosing MS from NMOSD using 3-T MRI. PMID: 33029961 [PubMed]
Source: Journal of Clinical Neurology - Category: Neurology Tags: J Clin Neurol Source Type: research
This study investigated antibacterial-producing Streptomyces isolated from the gut of estuarine fish Chanos chanos, emphasizing screening for the producer of peptide-containing antibacterial compounds. Eighteen isolates were found during preliminary screening, in which four isolates showed the best antibacterial activities. Based on the morphological, physiological, and biochemical characterization, as well as 16S rRNA partial sequencing, all of the four isolates belonged to Streptomyces. Three isolates were suspected as novel isolate candidates based on homology presentations and phylogenetic tree analysis. Disk-diffusion...
Source: International Journal of Microbiology - Category: Microbiology Tags: Int J Microbiol Source Type: research
Authors: Phuyal N, Jha PK, Raturi PP, Rajbhandary S Abstract Crude methanol extracts of fruits, seeds, and bark of Zanthoxylum armatum were investigated in vitro for antimicrobial activities against 9 different bacterial strains: Bacillus subtilis, Enterococcus faecalis, Proteus vulgaris, Pseudomonas aeruginosa, Salmonella typhi, Shigella dysenteriae, Staphylococcus aureus, methicillin-resistant Staphylococcus aureus (MRSA), and Staphylococcus epidermidis using agar well diffusion method, and the MBC values were determined. Only 5 bacteria, i.e., Bacillus subtilis, Enterococcus faecalis, MRSA, Staphylococcus aureus...
Source: Journal of Tropical Medicine - Category: Tropical Medicine Tags: J Trop Med Source Type: research
François Chassagne1†, Xinyi Huang1†, James T. Lyles1 and Cassandra L. Quave1,2* 1Center for the Study of Human Health, Emory University, Atlanta, GA, United States 2Department of Dermatology, Emory University, Atlanta, GA, United States In the search for new therapeutic solutions to address an increasing number of multidrug-resistant bacterial pathogens, secondary metabolites from plants have proven to be a rich source of antimicrobial compounds. Ginkgo biloba, a tree native to China, has been spread around the world as an ornamental tree. Its seeds have been used as snacks and medical mater...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
Publication date: 15 September 2017 Source:LWT - Food Science and Technology, Volume 83 Author(s): Surya Kant Verma, Shiv Kumar Sood, Ram Krishan Saini, Neha Saini The present study was carried out to enhance shelf life of raw buffalo milk by the use of pediocin PA-1 containing fermented cheese whey (PCFCW) as bio-preservative. Ten distinct genera of milk microbes could be identified as Streptococcus, Enterococcus, Salmonella, Campylobacter, Lactobacillus, Enterobacter, E. coli, Shigella, Candida and Aspergillus. For the production of PCFCW, supplemented cheese whey medium was fermented with Pediococcus pentosaceous NCDC ...
Source: LWT Food Science and Technology - Category: Food Science Source Type: research
The World Health Organization is issuing a warning about a group of deadly bacteria: Recently, the WHO released its first-ever list of “priority pathogens,” a list of antibiotic-resistant bacteria that the organization says pose the greatest threat to human health. The list is divided into three categories: critical-, high- and medium-priority. Three pathogens made it into the critical-priority group. These bacteria are resistant to multiple antibiotics and pose a high risk to people in hospitals and nursing homes, the WHO says. Multidrug-resistant bacteria, sometimes called “superbugs,” are a ...
Source: Science - The Huffington Post - Category: Science Source Type: news
More News: Chemistry | Dysentery | Enterococcus | Gastroenteritis | Infectious Diseases | Materials Science | MRSA | Nanotechnology | PET Scan | Physics | Salmonella | Staphylococcus Aureus | Superbugs