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nanomaterial and biofilm

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https://www.readbyqxmd.com/read/27908256/a-review-on-nano-antimicrobials-metal-nanoparticles-methods-and-mechanisms
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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...
August 10, 2016: Critical Reviews in Biotechnology
https://www.readbyqxmd.com/read/27622944/nanomaterials-for-the-treatment-of-bacterial-biofilms
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
https://www.readbyqxmd.com/read/26682456/nanomaterial-based-approaches-for-prevention-of-biofilm-associated-infections-on-medical-devices-and-implants
#16
Kshipra Naik, Pallavee Srivastava, Ketaki Deshmukh, M S Monsoor, Meenal Kowshik
Biofilm formation is a major problem in medical device-related infections leading to failure of implant-based therapies. Though various conventional approaches to counter biofilm formation like physical and/or mechanical removal, chemical removal, and the use of antimicrobials exist, they fail due to increased resistance of biofilms. This review discusses various nanomaterial-based approaches such as the use of metallic and metal oxide nanoparticles- and polymer-based nanocomposites, which are currently being developed for prevention and treatment of biofilms...
December 2015: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/26573588/a-nanomolecular-approach-to-decrease-adhesion-of-biofouling-producing-bacteria-to-graphene-coated-material
#17
Carolina Parra, Fernando Dorta, Edra Jimenez, Ricardo Henríquez, Cristian Ramírez, Rodrigo Rojas, Patricio Villalobos
BACKGROUND: Biofouling, the colonization of artificial and natural surfaces by unwanted microorganisms, has an important economic impact on a wide range of industries. Low cost antifouling strategies are typically based on biocides which exhibit a negative environmental impact, affecting surrounding organisms related and not related to biofouling. Considering that the critical processes resulting in biofouling occur in the nanoscale/microscale dimensions, in this work we present a bionanotechnological approach to reduce adhesion of biofilm-producing bacteria Halomonas spp...
2015: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/26545862/in-vitro-study-of-the-antibacterial-properties-and-impact-strength-of-dental-acrylic-resins-modified-with-a-nanomaterial
#18
Denise T de Castro, Mariana L C Valente, José Augusto M Agnelli, Cláudia H Lovato da Silva, Evandro Watanabe, Renato L Siqueira, Oswaldo L Alves, Raphael D Holtz, Andréa C dos Reis
STATEMENT OF PROBLEM: The accumulation of bacteria on the surface of dental prostheses can lead to systemic disease. PURPOSE: The purpose of this in vitro study was to evaluate the growth of Staphylococcus aureus and Pseudomonas aeruginosa on the surface of autopolymerizing (AP) and heat-polymerizing (HP) acrylic resins incorporated with nanostructured silver vanadate (β-AgVO3) and its impact strength. MATERIAL AND METHODS: For each resin, 216 circular specimens (9 × 2 mm) were prepared for microbiologic analysis and 60 rectangular specimens (65 × 10 × 3...
February 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/26429230/nanoparticle-conversion-to-biofilms-in-vitro-demonstration-using-serum-derived-mineralo-organic-nanoparticles
#19
Tsui-Yin Wong, Hsin-Hsin Peng, Cheng-Yeu Wu, Jan Martel, David M Ojcius, Fu-Yung Hsu, John D Young
AIMS: Mineralo-organic nanoparticles (NPs) detected in biological fluids have been described as precursors of physiological and pathological calcifications in the body. Our main objective was to examine the early stages of mineral NP formation in body fluids. MATERIALS & METHODS: A nanomaterial approach based on atomic force microscopy, dynamic light scattering, electron microscopy and spectroscopy was used. RESULTS: The mineral particles, which contain the serum proteins albumin and fetuin-A, initially precipitate in the form of round amorphous NPs that gradually grow in size, aggregate and coalesce to form crystalline mineral films similar to the structures observed in calcified human arteries...
2015: Nanomedicine
https://www.readbyqxmd.com/read/26305189/antimicrobial-photodynamic-inactivation-in-nanomedicine-small-light-strides-against-bad-bugs
#20
REVIEW
Rui Yin, Tanupriya Agrawal, Usman Khan, Gaurav K Gupta, Vikrant Rai, Ying-Ying Huang, Michael R Hamblin
The relentless advance of drug-resistance among pathogenic microbes, mandates a search for alternative approaches that will not cause resistance. Photodynamic inactivation (PDI) involves the combination of nontoxic dyes with harmless visible light to produce reactive oxygen species that can selectively kill microbial cells. PDI can be broad-spectrum in nature and can also destroy microbial cells in biofilms. Many different kinds of nanoparticles have been studied to potentiate antimicrobial PDI by improving photosensitizer solubility, photochemistry, photophysics and targeting...
2015: Nanomedicine
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