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nanomaterial and biofilm

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https://www.readbyqxmd.com/read/28335307/zinc-oxide-nanorods-decorated-graphene-nanoplatelets-a-promising-antimicrobial-agent-against-the-cariogenic-bacterium-streptococcus-mutans
#1
Elena Zanni, Chandrakanth Reddy Chandraiahgari, Giovanni De Bellis, Maria Rita Montereali, Giovanna Armiento, Paolo Ballirano, Antonella Polimeni, Maria Sabrina Sarto, Daniela Uccelletti
Nanomaterials are revolutionizing the field of medicine to improve the quality of life due to the myriad of applications stemming from their unique properties, including the antimicrobial activity against pathogens. In this study, the antimicrobial and antibiofilm properties of a novel nanomaterial composed by zinc oxide nanorods-decorated graphene nanoplatelets (ZNGs) are investigated. ZNGs were produced by hydrothermal method and characterized through field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) techniques...
September 29, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28110014/nanosilver-as-a-disinfectant-in-dental-unit-waterlines-assessment-of-the-physicochemical-transformations-of-the-agnps
#2
Alireza Gitipour, Souhail R Al-Abed, Stephen W Thiel, Kirk G Scheckel, Thabet Tolaymat
Dental unit water lines (DUWL) are susceptible to biofilm development and bacterial growth leading to water contamination, causing health and ecological effects. This study monitors the interactions between a commonly used nanosilver disinfectant (ASAP-AGX-32, an antimicrobial cleaner for dental units, 0.0032% Ag) and biofilm development in DUWL. To simulate the disinfection scenario, an in-house DUWL model was assembled and biofilm accumulation was allowed. Subsequent to biofilm development, the disinfection process was performed according to the manufacturer's instructions...
January 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/27995243/nano-layered-magnesium-fluoride-reservoirs-on-biomaterial-surfaces-strengthen-polymorphonuclear-leukocyte-resistance-to-bacterial-pathogens
#3
Geyong Guo, Huaijuan Zhou, Qiaojie Wang, Jiaxing Wang, Jiaqi Tan, Jinhua Li, Ping Jin, Hao Shen
Biomaterial-related bacterial infections cause patient suffering, mortality and extended periods of hospitalization, imposing a substantial burden on medical systems. In this context, understanding of nanomaterials-bacteria-cells interactions is of both fundamental and clinical significance. Herein, nano-MgF2 films were deposited on titanium substrate via magnetron sputtering. Using this platform, the antibacterial behavior and mechanism of the nano-MgF2 films were investigated in vitro and in vivo. It was found that, for S...
December 20, 2016: Nanoscale
https://www.readbyqxmd.com/read/27933975/high-antibacterial-activity-of-functionalized-chemically-exfoliated-mos2
#4
Subhendu Pandit, Subbaraj Karunakaran, Sunil Kumar Boda, Bikramjit Basu, Mrinmoy De
In view of the implications of inherent resistance of pathogenic bacteria, especially ESKAPE pathogens toward most of the commercially available antibiotics and the importance of these bacteria-induced biofilm formation leading to chronic infection, it is important to develop new-generation synthetic materials with greater efficacy toward antibacterial property. In addressing this issue, this paper reports a proof-of-principle study to evaluate the potential of functionalized two-dimensional chemically exfoliated MoS2 (ce-MoS2) toward inhibitory and bactericidal property against two representative ESKAPE pathogenic strain-a Gram-positive Staphylococcus aureus (MRSA) and a Gram-negative Pseudomonas aeruginosa...
November 23, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27916691/therapeutic-effects-of-gold-nanoparticles-synthesized-using-musa-paradisiaca-peel-extract-against-multiple-antibiotic-resistant-enterococcus-faecalis-biofilms-and-human-lung-cancer-cells-a549
#5
S Vijayakumar, B Vaseeharan, B Malaikozhundan, N Gopi, P Ekambaram, R Pachaiappan, P Velusamy, K Murugan, G Benelli, R Suresh Kumar, M Suriyanarayanamoorthy
Botanical-mediated synthesis of nanomaterials is currently emerging as a cheap and eco-friendly nanotechnology, since it does not involve the use of toxic chemicals. In the present study, we focused on the synthesis of gold nanoparticles using the aqueous peel extract of Musa paradisiaca (MPPE-AuNPs) following a facile and cheap fabrication process. The green synthesized MPPE-AuNPs were bio-physically characterized by UV-Vis spectroscopy, FTIR, XRD, TEM, Zeta potential analysis and EDX. MPPE-AuNPs were crystalline in nature, spherical to triangular in shape, with particle size ranging within 50 nm...
January 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/27908256/a-review-on-nano-antimicrobials-metal-nanoparticles-methods-and-mechanisms
#6
Edris Hoseinzadeh, Pouran Makhdoumi, Parisa Taha, John Stelling, Hooshyar Hossini, Mohammad Amjad Kamal, Ghulam Md Ashraf
Nanotechnology is a scientific and engineering technology conducted at the Nano-scale, such as in the fields of compound fabric manufacturing, food processing, agricultural processing, and engineering, as well as in medical and medicinal application. In recent decade, nanomaterial applications for antimicrobial works have been interested by many researchers. Available reports show that some of the metal oxide Nanoparticles including; Al2O3, TiO2, ZnO, CuO, Co3O4, In2O3, MgO, SiO2, ZrO2, Cr2O3, Ni2O3, Mn2O3, CoO, and Nickel oxide have toxicity toward several microorganisms and they could successfully kill numerous bacteria...
December 1, 2016: Current Drug Metabolism
https://www.readbyqxmd.com/read/27799768/core-shell-magnetic-nanoparticles-display-synergistic-antibacterial-effects-against-pseudomonas-aeruginosa-and-staphylococcus-aureus-when-combined-with-cathelicidin-ll-37-or-selected-ceragenins
#7
Katarzyna Niemirowicz, Ewelina Piktel, Agnieszka Z Wilczewska, Karolina H Markiewicz, Bonita Durnaś, Marzena Wątek, Irena Puszkarz, Marta Wróblewska, Wiesława Niklińska, Paul B Savage, Robert Bucki
Core-shell magnetic nanoparticles (MNPs) are promising candidates in the development of new treatment methods against infections, including those caused by antibiotic-resistant pathogens. In this study, the bactericidal activity of human antibacterial peptide cathelicidin LL-37, synthetic ceragenins CSA-13 and CSA-131, and classical antibiotics vancomycin and colistin, against methicillin-resistant Staphylococcus aureus Xen 30 and Pseudomonas aeruginosa Xen 5, was assessed alone and in combination with core-shell MNPs...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27794590/synthetic-biogenesis-of-bacterial-amyloid-nanomaterials-with-tunable-inorganic-organic-interfaces-and-electrical-conductivity
#8
Urartu Ozgur Safak Seker, Allen Yuyin Chen, Robert J Citorik, Timothy K Lu
Amyloids are highly ordered, hierarchal protein nanoassemblies. Functional amyloids in bacterial biofilms, such as Escherichia coli curli fibers, are formed by the polymerization of monomeric proteins secreted into the extracellular space. Curli is synthesized by living cells, is primarily composed of the major curlin subunit CsgA, and forms biological nanofibers with high aspect ratios. Here, we explore the application of curli fibers for nanotechnology by engineering curli to mediate tunable biological interfaces with inorganic materials and to controllably form gold nanoparticles and gold nanowires...
October 30, 2016: ACS Synthetic Biology
https://www.readbyqxmd.com/read/27788125/high-performance-bio-based-hyperbranched-polyurethane-carbon-dot-silver-nanocomposite-a-rapid-self-expandable-stent
#9
Rituparna Duarah, Yogendra P Singh, Prerak Gupta, Biman B Mandal, Niranjan Karak
Development of a bio-based smart implantable material with multifaceted attributes of high performance, potent biocompatibility and inherent antibacterial property, particularly against drug resistant bacteria, is a challenging task in biomedical domain. Addressing these aspects at the bio-nano interface, we report the in situ fabrication of starch modified hyperbranched polyurethane (HPU) nanocomposites by incorporating different weight percentages of carbon dot-silver nanohybrid during polymerization process...
October 27, 2016: Biofabrication
https://www.readbyqxmd.com/read/27690228/impairment-of-biofilm-formation-by-tio2-photocatalysis-through-quorum-quenching
#10
Xiang Xiao, Wen-Wen Zhu, Qiu-Yue Liu, Hang Yuan, Wen-Wei Li, Li-Jun Wu, Qian Li, Han-Qing Yu
The release of nanomaterials into the environment, due to their massive production and application today, has caused ecological and health safety concerns. Semiconductor photocatalysts like TiO2 exhibit cytotoxicity to bacterial cells when exposed to UV irradiation. However, information about their impacts on individual or group bacterial behaviors is limited. In this work, the biofilm formation of Escherichia coli K12 in the presence of TiO2 with and without UV irradiation was investigated and biofilm formation was found not to be affected under the sole application of TiO2 or UV irradiation...
October 13, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27684212/bactericidal-quorum-quenching-and-anti-biofilm-nanofactories-a-new-niche-for-nanotechnologists
#11
Brahma N Singh, Prateeksha, Dalip K Upreti, Braj Raj Singh, Tom Defoirdt, Vijai K Gupta, Ana Olivia De Souza, Harikesh Bahadur Singh, João C M Barreira, Isabel C F R Ferreira, Khabat Vahabi
Despite several conventional potent antibacterial therapies, bacterial infections pose a significant threat to human health because they are emerging as the leading cause of death worldwide. Due to the development of antibiotic resistance in bacteria, there is a pressing demand to discover novel approaches for developing more effective therapies to treat multidrug-resistant bacterial strains and biofilm-associated infections. Therefore, attention has been especially devoted to a new and emerging branch of science "nanotechnology" to design non-conventional antimicrobial chemotherapies...
June 2017: Critical Reviews in Biotechnology
https://www.readbyqxmd.com/read/27622944/nanomaterials-for-the-treatment-of-bacterial-biofilms
#12
Li-Sheng Wang, Akash Gupta, Vincent M Rotello
Treatment of biofilm-associated infections is challenging, requiring the development of new therapeutic strategies. In this viewpoint, we discuss the use of nanoparticle-based systems as active therapeutic agents and as vehicles to transport drugs to the site of infection. These applications require understanding of the surface interactions of nanoparticles with bacteria/biofilms, an aspect that we likewise summarize.
January 8, 2016: ACS Infectious Diseases
https://www.readbyqxmd.com/read/27554277/ultrasonic-assisted-green-synthesis-of-flower-like-silver-nanocolloids-using-marine-sponge-extract-and-its-effect-on-oral-biofilm-bacteria-and-oral-cancer-cell-lines
#13
D Inbakandan, C Kumar, M Bavanilatha, Dune Naga Ravindra, R Kirubagaran, S Ajmal Khan
The knowhow followed for synthesis, characterization and application of nanomaterials has become an important branch of nanoscience. The use of marine sponges for the synthesis of metal nanoparticles is still in the budding level of current nanobiotechnology. This paper reports a single step one pot biosynthesis utilizing marine sponge (Haliclona exigua) extract as a reducing agent by means of a conventional ultrasonic bath on the formation and growth of flower like silver nanocolloids. These silver nanocolloids were characterized through UV visible spectroscopy, High Resolution Transmission Electron Microscope, Fourier Transform Infrared spectroscopy and X-ray Diffractometer...
October 2016: Microbial Pathogenesis
https://www.readbyqxmd.com/read/27438339/chitosan-iron-oxide-coated-graphene-oxide-nanocomposite-hydrogel-a-robust-and-soft-antimicrobial-biofilm
#14
Achyut Konwar, Sanjeeb Kalita, Jibon Kotoky, Devasish Chowdhury
We report a robust biofilm with antimicrobial properties fabricated from chitosan-iron oxide coated graphene oxide nanocomposite hydrogel. For the first time, the coprecipitation method was used for the successful synthesis of iron oxide coated graphene oxide (GIO) nanomaterial. After this, films were fabricated by the gel-casting technique aided by the self-healing ability of the chitosan hydrogel network system. Both the nanomaterial and the nanocomposite films were characterized by techniques such as scanning electron microscopy, FT-IR spectroscopy, X-ray diffraction, and vibrating sample magnetometry...
August 17, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27220400/inhibition-of-gold-nanoparticles-aunps-on-pathogenic-biofilm-formation-and-invasion-to-host-cells
#15
Qilin Yu, Jianrong Li, Yueqi Zhang, Yufan Wang, Lu Liu, Mingchun Li
Owing to the growing infectious diseases caused by eukaryotic and prokaryotic pathogens, it is urgent to develop novel antimicrobial agents against clinical pathogenic infections. Biofilm formation and invasion into the host cells are vital processes during pathogenic colonization and infection. In this study, we tested the inhibitory effect of Au nanoparticles (AuNPs) on pathogenic growth, biofilm formation and invasion. Interestingly, although the synthesized AuNPs had no significant toxicity to the tested pathogens, Candida albicans and Pseudomonas aeruginosa, the nanoparticles strongly inhibited pathogenic biofilm formation and invasion to dental pulp stem cells (DPSCs)...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27077871/antibacterial-applications-of-nanodiamonds
#16
REVIEW
Sabine Szunerits, Alexandre Barras, Rabah Boukherroub
Bacterial infectious diseases, sharing clinical characteristics such as chronic inflammation and tissue damage, pose a major threat to human health. The steady increase of multidrug-resistant bacteria infections adds up to the current problems modern healthcare is facing. The treatment of bacterial infections with multi-resistant germs is very difficult, as the development of new antimicrobial drugs is hardly catching up with the development of antibiotic resistant pathogens. These and other considerations have generated an increased interest in the development of viable alternatives to antibiotics...
April 12, 2016: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/27006760/nanoparticle-based-antimicrobials-surface-functionality-is-critical
#17
REVIEW
Akash Gupta, Ryan F Landis, Vincent M Rotello
Bacterial infections cause 300 million cases of severe illness each year worldwide. Rapidly accelerating drug resistance further exacerbates this threat to human health. While dispersed (planktonic) bacteria represent a therapeutic challenge, bacterial biofilms present major hurdles for both diagnosis and treatment. Nanoparticles have emerged recently as tools for fighting drug-resistant planktonic bacteria and biofilms. In this review, we present the use of nanoparticles as active antimicrobial agents and drug delivery vehicles for antibacterial therapeutics...
2016: F1000Research
https://www.readbyqxmd.com/read/26954088/delivery-of-fluorophores-by-calcium-phosphate-coated-nanoliposomes-and-interaction-with-staphylococcus-aureus-biofilms
#18
Ignacio Rivero Berti, María Laura Dell' Arciprete, María Laura Dittler, Alejandro Miñan, Mónica Fernández Lorenzo de Mele, Mónica Gonzalez
The delivery capacity and mechanical stability of calcium phosphate (CaP) coated 1,2-dioleoyl-sn-glycero-3-phosphate (DOPA) liposomes free and adsorbed on bacterial surface was investigated introducing either acridine orange (AO) or 5,10,15,20-Tetrakis(1-methyl-4-pyridinio)porphyrin (TMP) in the aqueous core of the liposomes. The obtained nanomaterials were thoroughly characterized by electron and optical microscopy and by fluorescence techniques. Distribution of the AO and TMP molecules between the aqueous liposomes core and the outer solution was demonstrated by the band shifts and broadening of the excitation-emission matrices and the modified Stern-Volmer model for fluorescence quenching...
June 1, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/26867687/effects-of-fullerene-c60-multi-wall-carbon-nanotubes-mwcnt-single-wall-carbon-nanotubes-swcnt-and-hydroxyl-and-carboxyl-modified-single-wall-carbon-nanotubes-on-riverine-microbial-communities
#19
J R Lawrence, M J Waiser, G D W Swerhone, J Roy, V Tumber, A Paule, A P Hitchcock, J J Dynes, D R Korber
Commercial production of nanoparticles (NP) has created a need for research to support regulation of nanotechnology. In the current study, microbial biofilm communities were developed in rotating annular reactors during continuous exposure to 500 μg L(-1) of each nanomaterial and subjected to multimetric analyses. Scanning transmission X-ray spectromicroscopy (STXM) was used to detect and estimate the presence of the carbon nanomaterials in the biofilm communities. Microscopy observations indicated that the communities were visibly different in appearance with changes in abundance of filamentous cyanobacteria in particular...
May 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/26811181/escherichia-coli-biofilm-development-and-therapeutic-strategies
#20
REVIEW
G Sharma, S Sharma, P Sharma, D Chandola, S Dang, S Gupta, R Gabrani
Escherichia coli biofilm consists of a bacterial colony embedded in a matrix of extracellular polymeric substances (EPS) which protects the microbes from adverse environmental conditions and results in infection. Besides being the major causative agent for recurrent urinary tract infections, E. coli biofilm is also responsible for indwelling medical device-related infectivity. The cell-to-cell communication within the biofilm occurs due to quorum sensors that can modulate the key biochemical players enabling the bacteria to proliferate and intensify the resultant infections...
August 2016: Journal of Applied Microbiology
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