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Microorganism, metal nanoparticles

Lata Ramrakhiani, Sourja Ghosh
Biological synthesis of nanoparticles (NPs) involves greater prospect; however, a detailed review is required for ecofriendly, faster and stable NP formulation in large scale for different commercial applications. The present article highlighted recent updates on biological route of single and bimetallic NP synthesis wherein the chemical reducing agents are eliminated and biological entities are utilised to convert metal ions to NPs. Application of the biological reducing agents ranging from bacteria to fungi and even natural plant extracts have emerged as eco-friendly and cost-effective routes for the synthesis of metal nanomaterials...
June 2018: IET Nanobiotechnology
Manikandan Dhayalan, Michael Immanuel Jesse Denison, Manikandan Ayyar, N N Gandhi, Kathiravan Krishnan, Baykal Abdulhadi
In modern era, the great interest and demand among chemists and researchers for metal nanoparticles is increasing in the application of biomedical fields, textiles, cosmetics and various sectors. Consequently, the present study reports an eco-friendly, cost-effective, rapid and easy method to produce environment-friendly metal nanoparticles to prevent exhaustion of metal resources. In this context, gold and silver metal nanoparticles were green synthesized using the Root Extract of Coleous forskohlii (RECo) as capping and reducing agent...
May 1, 2018: Journal of Photochemistry and Photobiology. B, Biology
Agata Roguska, Anna Belcarz, Justyna Zalewska, Marcin Holdynski, Mariusz Andrzejczuk, Marcin Pisarek, Grazyna Ginalska
Titanium oxide nanotubes layers with silver and zinc nanoparticles are attracting increasing attention in the design of bone and dental implants, due to their antimicrobial potential and their ability to control host cell adhesion, growth and differentiation. However, recent reports indicate that the etiology of dental infections is more complex than has been previously considered. Therefore, the antimicrobial potential of dental implants should be evaluated against at least several different microorganisms cooperating in human mouth colonization...
May 2, 2018: ACS Applied Materials & Interfaces
Ibrahim Ali Radini, Nazim Hasan, Maqsood Ahmad Malik, Zaheer Khan
Trigonella foenum-graecum is the source of various biological and chemical constituents with a wide area of applications, especially in the treatment/prevention of diabetes and other chronic diseases such as cancer. Multiple biological and organic moieties in the aqueous or the organic phase of Trigonella foenum-graecum carry soft reduction properties to reduce the metal cations to nanoparticles. In this investigation, the Trigonella foenum-graecum was found in the seed extract for the first time in an aqueous medium...
April 17, 2018: Journal of Photochemistry and Photobiology. B, Biology
Еlena Yausheva, Sergey Miroshnikov, Еlena Sizova
The research included the study of influence of ultrafine particle preparations (nanoparticles of copper, zinc, iron, CuZn alloy) and metal salts (iron pyrophosphate, copper asparginate, zinc asparginate) on the composition of cecal microbiota of broiler chickens. Before adding the studied nanoparticles and metal salts to the diet, cecal microbiota of broiler chickens was represented by 76% Firmicutes taxon and 16% Bacteroidetes. Numerous among them were the bacteria of the taxa Anaerotruncus spp., Lactobacillus spp...
April 24, 2018: Environmental Science and Pollution Research International
Basma A Omran, Hussein N Nassar, Nesreen A Fatthallah, A Hamdy, Einas H El-Shatoury, Nour Sh El-Gendy
AIMS: Since mycosynthesis of metal nanoparticles is advertised as a promising and eco- friendly approach. Thus, the present study aims to investigate the capability of Aspergillus brasiliensis ATCC 16404 for mycosynthesis of silver nanoparticles (AgNPs). METHODS AND RESULTS: One-factor-at-a-time-technique was used to study the effect of different physicochemical parameters; the reaction time, pH, temperature, different stirring rates, illumination and finally the different concentrations of silver nitrate and fungal biomass on the mycosynthesis of AgNPs...
April 6, 2018: Journal of Applied Microbiology
Ashajyothi C, Harish K Handral, Chandrakanth Kelmani R
During the present time, anti-microbial features of copper (Cu) and zinc oxide (ZnO) nanoparticles (NPs) are extensively used to combat the growth of pathogenic microbes. CuNPs and ZnONPs are recurrently used in cosmetics, medicine and food additives, and their potential for toxic impacts on human and ecosystem is of high concern. In this study, the fate and toxicity of 16- to 96-nm-ranged biosynthesized copper (Bio-CuNPs) and zinc oxide (Bio-ZnONPs) was assessed in male Wistar rats. In vivo exposures of the two nanoparticles are achieved through two different administration routes namely, intraperitoneal (i/p) and intravenous (i/v) injections...
April 3, 2018: Nanoscale Research Letters
Claudia Ursino, Roberto Castro-Muñoz, Enrico Drioli, Lassaad Gzara, Mohammad H Albeirutty, Alberto Figoli
The use of membrane-based technologies has been applied for water treatment applications; however, the limitations of conventional polymeric membranes have led to the addition of inorganic fillers to enhance their performance. In recent years, nanocomposite membranes have greatly attracted the attention of scientists for water treatment applications such as wastewater treatment, water purification, removal of microorganisms, chemical compounds, heavy metals, etc. The incorporation of different nanofillers, such as carbon nanotubes, zinc oxide, graphene oxide, silver and copper nanoparticles, titanium dioxide, 2D materials, and some other novel nano-scale materials into polymeric membranes have provided great advances, e...
April 3, 2018: Membranes
Bo Peng, Xinglin Zhang, Dirk G A L Aarts, Roel P A Dullens
Recent progress in synthetic nanotechnology and the ancient use of metals in food preservation and the antibacterial treatment of wounds have prompted the development of nanometallic materials for antimicrobial applications1-4 . However, the materials designed so far do not simultaneously display antimicrobial activity and the capability of binding and capturing bacteria and spores. Here, we develop a one-step pyrolysis procedure to synthesize monodisperse superparamagnetic nickel colloidal nanocrystal clusters (SNCNCs), which show both antibacterial activity and the ability to bind Gram-positive (Bacillus subtilis) and Gram-negative (Escherichia coli) bacteria, as well as bacterial spores...
April 2, 2018: Nature Nanotechnology
Haikun Zhang, Xiaoke Hu
Recovery of noble metals using marine bacteria is becoming an attractive research area because the marine microbes can better adapt to unfavorable environment than terrestrial microorganisms. In this study, we first reported that a marine Bacillus sp. GP was capable of producing Pd and Au NPs in the presence of sodium lactate. Ultraviolet visible spectrometer (UV-vis), transmission electron microscopy (TEM), X-ray diffraction patterns (XRD), X-ray photoelectron spectroscopy (XPS) and fourier transform infrared spectroscopy (FTIR) analyses were employed to explain the process and mechanism of Pd(II)/Au(III) reduction through GP...
June 2018: Enzyme and Microbial Technology
Vladimir N Popok, Cesarino M Jeppesen, Peter Fojan, Anna Kuzminova, Jan Hanuš, Ondřej Kylián
Background: Antibacterial materials are of high importance for medicine, and for the production and conservation of food. Among these materials, polymer films with metal nanoparticles (NPs) are of considerable interest for many practical applications. Results: The paper describes a novel approach for the formation of bactericidal polymer thin films (polystyrene in this case), produced by spin-coating, with Ti and Cu NPs deposited from cluster beams. Ti NPs are treated in three different ways in order to study different approaches for oxidation and, thus, efficiency in formation of the particles with semiconducting properties required for the catalytic formation of reactive oxygen species...
2018: Beilstein Journal of Nanotechnology
Anupriya Baranwal, Ananya Srivastava, Pradeep Kumar, Vivek K Bajpai, Pawan K Maurya, Pranjal Chandra
Nanostructured materials (NSMs) have increasingly been used as a substitute for antibiotics and additives in various products to impart microbicidal effect. In particular, use of silver nanoparticles (AgNPs) has garnered huge researchers' attention as potent bactericidal agent due to the inherent antimicrobial property of the silver metal. Moreover, other nanomaterials (carbon nanotubes, fullerenes, graphene, chitosan, etc.) have also been studied for their antimicrobial effects in order ensure their application in widespread domains...
2018: Frontiers in Microbiology
Aleksey Nikolayevich Sizentsov, Olga Vilorievna Kvan, Elena Petrovna Miroshnikova, Irina Aleksandrovna Gavrish, Victoria Alekseevna Serdaeva, Artem Vladimirovich Bykov
Copper nanoparticle Cu (d = 55 ± 15 nm) and CuO nanoparticles (d = 90 ± 10 nm) were used in the studies (OOO Platina, Russia). Using the method of pure cultures, we extracted Lactobacillus, Enterococcus, and Enterobacterium from the intestines of broilers. Additionally, strains of Bacillus subtilis 10641 and Bifidobacterium were involved in probiotic strains. The data obtained in the course of the study testify to the insignificant biotoxicity of copper nanoparticles with respect to representatives of the genera Lactobacillus (30 to 15 μg/ml) and Bifidobacterium (30 μg/ml), with the most sensitive bacteria being the genus Lactobacillus, for which a concentration of 7...
March 26, 2018: Environmental Science and Pollution Research International
Matheus Aparecido Dos Santos Ramos, Patrícia Bento Da Silva, Larissa Spósito, Luciani Gaspar De Toledo, Bruna Vidal Bonifácio, Camila Fernanda Rodero, Karen Cristina Dos Santos, Marlus Chorilli, Taís Maria Bauab
Since the dawn of civilization, it has been understood that pathogenic microorganisms cause infectious conditions in humans, which at times, may prove fatal. Among the different virulent properties of microorganisms is their ability to form biofilms, which has been directly related to the development of chronic infections with increased disease severity. A problem in the elimination of such complex structures (biofilms) is resistance to the drugs that are currently used in clinical practice, and therefore, it becomes imperative to search for new compounds that have anti-biofilm activity...
2018: International Journal of Nanomedicine
Muhammad Junaid Afzal, Erum Pervaiz, Sarah Farrukh, Tahir Ahmed, Zhang Bingxue, Minghui Yang
Highly integrated nanocomposite of Graphene oxide (GO) and its derivatives with metal oxides is essential for enhanced performance for various applications. Tuning the morphology is an important aspect during nanomaterials synthesis; this has an amplifying influence upon physicochemical properties of advanced functional materials. In this research work, GO/TiO2 nanotube composites have been successfully synthesized via alkaline hydrothermal treatment method by augmenting GO layers with two different phases of TiO2 (anatase and rutile) nanoparticles, followed by the hydrothermal treatment that also have caused reduction of GO to reduced GO (RGO)...
March 9, 2018: Environmental Technology
Humberto Palza, Mauricio Nuñez, Roberto Bastías, Katherine Delgado
Copper and its alloys are effective antimicrobial surface materials in the laboratory and in clinical trials. Copper has been used in the healthcare setting to reduce environmental contamination, and thus prevent healthcare-associated infections, complementing traditional protocols. The addition of copper nanoparticles to polymer/plastic matrices can also produce antimicrobial materials, as confirmed under laboratory conditions. However, there is a lack of studies validating the antimicrobial effects of these nanocomposite materials in clinical trials...
February 19, 2018: International Journal of Antimicrobial Agents
Lidiane Patrícia Gonçalves, Alejandro Miñán, Guillermo Benítez, Mónica Fernández Lorenzo de Mele, María Elena Vela, Patricia L Schilardi, Elias Paiva Ferreira-Neto, Júlia Cristina Noveletto, Wagner Rafael Correr, Ubirajara Pereira Rodrigues-Filho
Medical device-related infections represent a major healthcare complication, resulting in potential risks for the patient. Antimicrobial materials comprise an attractive strategy against bacterial colonization and biofilm proliferation. However, in most cases these materials are only bacteriostatic or bactericidal, and consequently they must be used in combination with other antimicrobials in order to reach the eradication condition (no viable microorganisms). In this study, a straightforward and robust antibacterial coating based on Phosphotungstate Ormosil doped with core-shell (SiO2 @TiO2 ) was developed using sol-gel process, chemical tempering, and Ag nanoparticle photoassisted synthesis (POrs-CS-Ag)...
April 1, 2018: Colloids and Surfaces. B, Biointerfaces
Xiaoming Ma, Peng Liu, Yuyang Tian, Guangshan Zhu, Ping Yang, Ge Wang, Lin Yang
A unique mineralized cell-based functional platform with biogenic intracellular hydroxyapatite nanoscaffolds (nHAP@yeasts) has been intelligently constructed using a biomimetic mineralization approach. Such a platform not only preserves the nature and functions of cells but also possesses intracellular nanoscaffolds, which endow the mineralized cells with novel functions in biological and nanotechnological applications. Benefiting from their unique organism shell and inorganic core, the nHAP@yeasts are biocompatible and have a large loading capacity for drugs...
February 15, 2018: Nanoscale
Ke Luo, Samuel Jung, Kyu-Hwan Park, Young-Rok Kim
Microbial biosynthesis of metal nanoparticles has been extensively studied for the applications in biomedical sciences and engineering. However, the mechanism for their synthesis through microorganism is not completely understood. In this study, several culture media were investigated for their roles in the microbial biosynthesis of silver nanoparticles (AgNPs). The size and morphology of the synthesized AgNPs were analyzed by UV-vis spectroscopy, Fourier-transform-infrared (FT-IR), transmission electron microscopy (TEM), and dynamic light scattering (DLS)...
January 31, 2018: Journal of Agricultural and Food Chemistry
Tuğçe Yurtluk, Fikriye Alev Akçay, Ayşe Avcı
Biosynthesis of silver nanoparticles (AgNPs) using microorganisms is an important application of nanobiotechnology and green chemistry because of interest by pharmaceutical and food manufacturers. In this study, biosynthesis of AgNPs by a novel Bacillus strain isolated from a soil sample from Sakarya district in Turkey was investigated. Biosynthesis was performed using cell-free supernatant of the bacterium following 24 h growth. Effects of varying AgNO3 concentration (1-10 mM), pH (5-10), and temperature (30-40°C) on the synthesis of AgNPs were determined...
February 7, 2018: Preparative Biochemistry & Biotechnology
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