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https://www.readbyqxmd.com/read/28098790/synthesis-structure-and-antimicrobial-properties-of-novel-benzalkonium-chloride-analogues-with-pyridine-rings
#1
Bogumił Brycki, Izabela Małecka, Anna Koziróg, Anna Otlewska
Quaternary ammonium compounds (QACs) are a group of compounds of great economic significance. They are widely used as emulsifiers, detergents, solubilizers and corrosion inhibitors in household and industrial products. Due to their excellent antimicrobial activity QACs have also gained a special meaning as antimicrobials in hospitals, agriculture and the food industry. The main representatives of the microbiocidal QACs are the benzalkonium chlorides (BACs), which exhibit biocidal activity against most bacteria, fungi, algae and some viruses...
January 13, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28091679/sustainability-of-renewable-fuel-infrastructure-a-screening-lca-case-study-of-anticorrosive-graphene-oxide-epoxy-liners-in-steel-tanks-for-the-storage-of-biodiesel-and-its-blends
#2
Govinda Chilkoor, Venkata K K Upadhyayula, Venkataramana Gadhamshetty, Nikhil Koratkar, Mats Tysklind
Biodiesel is a widely used fuel that meets the renewable fuel standards developed under the Energy Policy Act of 2005. However, biodiesel is known to pose a series of abiotic and biotic corrosion risks to storage tanks. A typical practice (incumbent system) used to protect the tanks from these risks include (i) coating the interior surface of the tank with a solvent-free epoxy (SFE) liner, and (ii) adding a biocide to the tank. Herein, we present a screening-level life-cycle assessment study to compare the environmental performance of a graphene oxide (GO)-epoxy (GOE) liner with the incumbent system...
January 16, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28089892/algerian-propolis-extracts-chemical-composition-bactericidal-activity-and-in%C3%A2-vitro-effects-on-gilthead-seabream-innate-immune-responses
#3
El-Khamsa Soltani, Rebeca Cerezuela, Noureddine Charef, Samia Mezaache-Aichour, Maria Angeles Esteban, Mohamed Mihoub Zerroug
Propolis has been used as a medicinal agent for centuries. The chemical composition of four propolis samples collected from four locations of the Sétif region, Algeria, using gas chromatography-mass spectrometry was determined. More than 20 compounds and from 30 to 35 compounds were identified in the aqueous and ethanolic extracts, respectively. Furthermore, the antimicrobial activity of the propolis extracts against two marine pathogenic bacteria was evaluated. Finally, the in vitro effects of propolis on gilthead seabream (Sparus aurata L...
January 9, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28079271/uptake-and-elimination-kinetics-of-the-biocide-triclosan-and-the-synthetic-musks-galaxolide-and-tonalide-in-the-earthworm-dendrobaena-veneta-when-exposed-to-sewage-sludge
#4
Ivo Havranek, Claire Coutris, Hans Ragnar Norli, Pierre-Adrien Rivier, Erik J Joner
Sewage sludge is an important amendment that enriches soils with organic matter and provides plants with nutrients such as nitrogen and phosphorus. However, knowledge on fate and effects of organic pollutants present in the sludge on soil organisms is limited. In the present study, the uptake of triclosan, galaxolide, and tonalide in the earthworm Dendrobaena veneta was measured one week after amendment of agricultural soil with sewage sludge, while elimination kinetics were assessed over a 21-day period after transferring worms to a clean soil...
January 12, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28077760/effective-delivery-of-volatile-biocides-employing-mesoporous-silicates-for-treating-biofilms
#5
Andrea C Chan, Marimar Bravo Cadena, Helen E Townley, Mark D Fricker, Ian P Thompson
Nanoparticulate delivery of biocides has the potential to decrease levels of exposure to non-target organisms, and miminize long-term exposure that can promote the development of resistance. Silica nanoparticles are an ideal vehicle since they are inert, biocompatible, biodegradable, and thermally and chemically stable. Encapsulation of biocides within nanoparticulates can improve their stability and longevity and maximize the biocidal potential of hydrophobic volatile compounds. Herein, we have shown that the plant secondary metabolites allyl isothiocyanate and cinnamaldehyde demonstrated increased antimicrobial activity against Escherichia coli in planktonic form, when packaged into mesoporous silica nanoparticles...
January 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28067359/antibacterial-properties-of-nanostructured-cu-tio2-surfaces-for-dental-implants
#6
Jonathan Rosenbaum, Davy Louis Versace, Samir Abbad-Andallousi, Remi Pires, Christophe Azevedo, Pierre Cénédese, Pierre Dubot
The influence of copper derived TiO2 surfaces (nCu-nT-TiO2) on the death of nosocomial Staphylococcus aureus (Sa) and Escherichia coli (Ec), was investigated. TiO2 nanotube (nT-TiO2) arrays were fabricated by anodic oxidation of pure titanium sheets in fluorhydric solutions, leading to surface nanostructuration and creation of specific reactive sites. Copper nanocubes with a mean size of 20 nm have been synthesized and deposited on the nT-TiO2 surface by pulsed electrodeposition from a copper sulphate solution...
January 9, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28065676/rhamnolipids-from-non-pathogenic-burkholderia-thailandensis-e264-physicochemical-characterization-antimicrobial-and-antibiofilm-efficacy-against-oral-hygiene-related-pathogens
#7
Mohamed Elshikh, Scott Funston, Alif Chebbi, Syed Ahmed, Roger Marchant, Ibrahim M Banat
Biosurfactants are naturally occurring surface active compounds that have mainly been exploited for environmental applications and consumer products, with their biomedical efficacy an emerging area of research. Rhamnolipids area major group of biosurfactants that have been reported for their antimicrobial and antibiofilm efficacy. One of the main limiting factors for scaled up production and downstream applications of rhamnolipids is the fact that they are predominantly produced from the opportunistic pathogen Pseudomonas aeruginosa...
January 5, 2017: New Biotechnology
https://www.readbyqxmd.com/read/28056742/fungal-biofilm-a-real-obstacle-against-an-efficient-therapy-lessons-from-candida
#8
Thaís Pereira de Mello, Lívia de Souza Ramos, Lys Adriana Braga-Silva, Marta Helena Branquinha, André Luis Souza Dos Santos
The past decades have witnessed a dramatic increase in invasive fungal infections, especially caused by different species belonging to the Candida genus. Nowadays, even after many improvements in several medical procedures, Candida infections (candidiasis) still account for an unacceptable high rate of morbimortality in hospital settings. Corroborating this statement, fungal biofilms formed on both abiotic and living surfaces are responsible for an important medical and economic burden, since biofilm lifestyle confers numerous advantages to the pathogens, including high tolerance to environmental stresses such as antimicrobials and host immune responses...
January 5, 2017: Current Topics in Medicinal Chemistry
https://www.readbyqxmd.com/read/28040182/effects-of-exposure-to-quaternary-ammonium-based-biocides-on-antimicrobial-susceptibility-and-tolerance-to-physical-stresses-in-bacteria-from-organic-foods
#9
Rebeca Gadea, Miguel Ángel Fernández Fuentes, Rubén Pérez Pulido, Antonio Gálvez, Elena Ortega
In the present study, a collection of 76 biocide-sensitive bacterial strains isolated from organically produced food were adapted by repeated exposure to increasing concentrations of the quaternary ammonium compounds (QACs) benzalkonium chloride (BC) and hexadecylpyridinium chloride (HDP). The sensitivity of both wildtype strains and their corresponding QAC-adapted strains to other biocides and to antibiotics was studied. QAC tolerance increased in 88.2% of strains for BC and in 30.3% of strains for HDP, with increases in minimum inhibitory concentrations between 2 and over 100 fold...
May 2017: Food Microbiology
https://www.readbyqxmd.com/read/28034542/shifts-in-microbial-community-structure-and-function-in-surface-waters-impacted-by-unconventional-oil-and-gas-wastewater-revealed-by-metagenomics
#10
N L Fahrenfeld, Hannah Delos Reyes, Alessia Eramo, Denise M Akob, Adam C Mumford, Isabelle M Cozzarelli
Unconventional oil and gas (UOG) production produces large quantities of wastewater with complex geochemistry and largely uncharacterized impacts on surface waters. In this study, we assessed shifts in microbial community structure and function in sediments and waters upstream and downstream from a UOG wastewater disposal facility. To do this, quantitative PCR for 16S rRNA and antibiotic resistance genes along with metagenomic sequencing were performed. Elevated conductivity and markers of UOG wastewater characterized sites sampled downstream from the disposal facility compared to background sites...
December 26, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/28034536/reduction-of-health-care-associated-infection-indicators-by-copper-oxide-impregnated-textiles-crossover-double-blind-controlled-study-in-chronic-ventilator-dependent-patients
#11
Esther-Lee Marcus, Hana Yosef, Gadi Borkow, Yehezkel Caine, Ady Sasson, Allon E Moses
BACKGROUND: Copper oxide has potent wide-spectrum biocidal properties. The purpose of this study is to determine if replacing hospital textiles with copper oxide-impregnated textiles reduces the following health care-associated infection (HAI) indicators: antibiotic treatment initiation events (ATIEs), fever days, and antibiotic usage in hospitalized chronic ventilator-dependent patients. METHODS: A 7-month, crossover, double-blind controlled trial including all patients in 2 ventilator-dependent wards in a long-term care hospital...
December 26, 2016: American Journal of Infection Control
https://www.readbyqxmd.com/read/28018705/antioxidant-and-antibacterial-potential-of-silver-nanoparticles-biogenic-synthesis-utilizing-apple-extract
#12
Upendra Nagaich, Neha Gulati, Swati Chauhan
The advancement of the biological production of nanoparticles using herbal extracts performs a significant role in nanotechnology discipline as it is green and does not engage harsh chemicals. The objective of the present investigation was to extract flavonoids in the mode of apple extract and synthesize its silver nanoparticles and ultimately nanoparticles loading into hydrogels. The presence of flavonoids in apple extract was characterized by preliminary testing like dil. ammonia test and confirmatory test by magnesium ribbon test...
2016: Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28006823/effects-of-antifouling-biocides-on-molecular-and-biochemical-defense-system-in-the-gill-of-the-pacific-oyster-crassostrea-gigas
#13
Mi Seon Park, Young Dae Kim, Bo-Mi Kim, Youn-Jung Kim, Jang Kyun Kim, Jae-Sung Rhee
Antifouling biocides such as organotin compounds and their alternatives are potent toxicants in marine ecosystems. In this study, we employed several molecular and biochemical response systems of the Pacific oyster Crassostrea gigas to understand a potential mode of action of antifouling biocides (i.e. tributyltin (TBT), diuron and irgarol) after exposure to different concentrations (0.01, 0.1, and 1 μg L-1) for 96 h. As a result, all the three antifouling biocides strongly induced the antioxidant defense system...
2016: PloS One
https://www.readbyqxmd.com/read/28004762/a-simple-and-rapid-method-for-optical-visualization-and-quantification-of-bacteria-on-textiles
#14
Philipp Stiefel, Jana Schneider, Caroline Amberg, Katharina Maniura-Weber, Qun Ren
To prevent bacterial contamination on textiles and the associated undesired effects different biocidal coatings have been investigated and applied. However, due to health and environmental concerns anti-adhesive coatings preventing the binding of bacteria would be favored. To develop such anti-adhesive coatings simple assays for reliable and fast screening are beneficial. Here an easy-to-handle, robust and rapid assay to assess bacteria on textiles utilizing a tetrazolium salt was reported. The assay allowed direct eye visualization of the color change of the textiles containing bacteria, facilitating fast screening...
December 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/28003630/in-vitro-evaluation-of-the-biocompatibility-of-newly-synthesized-bis-quaternary-ammonium-compounds-with-spacer-structures-derived-from-pentaerythritol-or-hydroquinone
#15
Masashi Yamamoto, Takashi Takami, Reiko Matsumura, Alexander Dorofeev, Yoshihiko Hirata, Hideaki Nagamune
 With the object of developing new biocides milder for human use than the current antiseptics, we synthesized a series of bis-quaternary ammonium compounds (bis-QACs). The antimicrobial activity of the newly synthesized bis-QACs and common biocides used as antiseptics was compared by examining minimum inhibitory concentrations and minimum bactericidal concentrations (MBCs). Moreover, the cytotoxicity of these compounds against human cells was determined to calculate the biocompatibility index (BI) of these compounds...
2016: Biocontrol Science
https://www.readbyqxmd.com/read/28001053/low-dose-effects-nonmonotonic-responses-for-the-toxicity-of-a-bacillus-thuringiensis-biocide-to-daphnia-magna
#16
Anderson Abel de Souza Machado, Christiane Zarfl, Saskia Rehse, Werner Kloas
Currently, there is a trend toward an increasing use of biopesticides assumed to be environmentally friendly, such as Bacillus thuringiensis (Bt). Studies of the Bt toxicity to nontarget organisms have reported low effects at high exposure levels, which is interpreted as indicating negligible risk to nontarget organisms. We investigated the response of the nontarget organism Daphnia magna to waterborne DiPel ES, a globally used Bt formulation. Neonates and adults were exposed for 48 h to a wide range of concentrations, and immobilization and mortality were monitored...
January 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/27992831/nanotechnology-to-the-rescue-using-nano-enabled-approaches-in-microbiological-food-safety-and-quality
#17
REVIEW
Mary Eleftheriadou, Georgios Pyrgiotakis, Philip Demokritou
Food safety and quality assurance is entering a new era. Interventions along the food supply chain must become more efficient in safeguarding public health and the environment and must address numerous challenges and new consumption trends. Current methods of microbial control to assure the safety of food and minimize microbial spoilage have each shown inefficiencies. Nanotechnology is a rapidly expanding area in the agri/feed/food sector. Nano-enabled approaches such as antimicrobial food-contact surfaces/packaging, nano-enabled sensors for rapid pathogen/contaminant detection and nano-delivered biocidal methods, currently on the market or at a developmental stage, show great potential for the food industry...
December 16, 2016: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/27989595/analysis-of-genomic-responses-in-a-rat-lung-model-treated-with-a-humidifier-sterilizer-containing-polyhexamethyleneguanidine-phosphate
#18
Min-Seok Kim, Seok Won Jeong, Seong-Jin Choi, Jin-Young Han, Sung-Hwan Kim, Seokjoo Yoon, Jung-Hwa Oh, Kyuhong Lee
The antimicrobial biocide polyhexamethyleneguanidine (PHMG) phosphate is the main ingredient in the commercially available humidifier disinfectant. PHMG phosphate-based humidifier disinfectants can cause pulmonary fibrosis and induce inflammatory and fibrotic responses both in vivo and in vitro. However, toxicological mechanisms including genomic alterations induced by inhalation exposure to PHMG phosphate have not been elucidated. Therefore, this study evaluated the toxicological effects of the PHMG phosphate-containing humidifier disinfectant...
December 15, 2016: Toxicology Letters
https://www.readbyqxmd.com/read/27989173/iodine-rich-imidazolium-iodate-and-periodate-salts-en-route-to-single-based-biocidal-agents
#19
Chunlin He, Joseph P Hooper, Jean'ne M Shreeve
Two classes of iodine-rich salts that consist of iodine-rich cations and iodate (IO3(-)) or periodate (IO4(-)) anions were synthesized. The synthesis of analogous I3O8(-) salts was more difficult because of poor solubility and hydrolytic instability. All iodine-rich salts were fully characterized by infrared, (1)H nuclear magnetic resonance, and (13)C nuclear magnetic resonance spectroscopy as well as elemental analyses. The molecular structures of compounds 15 and 24 were elucidated by X-ray single-crystal diffraction...
December 19, 2016: Inorganic Chemistry
https://www.readbyqxmd.com/read/27988897/green-mitigation-strategy-for-cultural-heritage-bacterial-potential-for-biocide-production
#20
Mara Silva, Tânia Rosado, Dora Teixeira, António Candeias, Ana Teresa Caldeira
Several biosurfactants with antagonistic activity are produced by a variety of microorganisms. Lipopeptides (LPPs) produced by some Bacillus strains, including surfactin, fengycin and iturin are synthesized nonribosomally by mega-peptide synthetase (NRPS) units and they are particularly relevant as antifungal agents. Characterisation, identification and evaluation of the potentials of several bacterial isolates were undertaken in order to establish the production of active lipopeptides against biodeteriogenic fungi from heritage assets...
December 17, 2016: Environmental Science and Pollution Research International
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