Antibacterial activity of silver nanoparticles obtained by pulsed laser ablation in pure water and in chloride solution

• Brunella Perito,
• Emilia Giorgetti,
• Paolo Marsili and
• Maurizio Muniz-Miranda

Beilstein J. Nanotechnol. 2016, 7, 465–473, doi:10.3762/bjnano.7.40

• also be affected by other parameters linked to the ablation conditions, such as the pulse width. The antibacterial activity of AgNPs was evaluated for NPs obtained either by nanosecond (ns) or picosecond (ps) PLAL using a 1064 nm ablation wavelength, in pure water or in LiCl aqueous solution, with

• -potential values were very negative, indicating excellent long-term colloidal stability. Antibacterial activity was observed against both microorganisms for the four AgNP formulations, but the ps-ablated nanoparticles were shown to more effectively inhibit the growth of both microorganisms. Moreover, LiCl

• : antibacterial activity; colloid; laser ablation; nanoparticles; silver; Introduction The interest in nanoscale metal particles is constantly growing as they find wide application in diverse fields ranging from sensing [1][2][3], medicine [4], catalysis [5][6][7][8], to astrobiology [9][10] and many others. In

Sonochemical co-deposition of antibacterial nanoparticles and dyes on textiles

• Ilana Perelshtein,
• Anat Lipovsky,
• Nina Perkas,
• Tzanko Tzanov and
• Aharon Gedanken

Beilstein J. Nanotechnol. 2016, 7, 1–8, doi:10.3762/bjnano.7.1

• antibacterial properties. The color fastness was evaluated by immersing the coated/dyed cotton in water and monitoring the absorbance of the colored fabric. Two major issues were solved in this research: i) the antibacterial activity of the metal oxide (MO) NPs was maintained while deposited simultaneously with

• after leaching experiments was characterized by reflectance measurements. Antibacterial test The antibacterial activity was tested according to the procedure described by our group previously [25]. Briefly, the antibacterial activity of MO- and MO/dye-coated fabrics was tested against E. coli. Overnight

• the best reaction parameters, which resulted in the highest antibacterial activity and coloration are reported in the experimental section. The presence of the dye on the fabric after the sonochemical reaction can be easily observed by the naked eye (Figure 2). While the color of RO16 changed only

Green and energy-efficient methods for the production of metallic nanoparticles

• Mitra Naghdi,
• Mehrdad Taheran,
• Satinder K. Brar,
• M. Verma,
• R. Y. Surampalli and
• J. R. Valero

Beilstein J. Nanotechnol. 2015, 6, 2354–2376, doi:10.3762/bjnano.6.243

• , 6, 24 and 48 h, respectively. According to the measured zeta potential of 54.5 mV, they concluded that the synthesized Ag NPs had acceptable stability [4]. In another study, they studied the antibacterial activity of different sizes of Ag NPs against two different bacteria and observed that Ag NPs

• with smaller size have a higher antibacterial activity [62]. Li et al. synthesized Ag NPs using PEG-200 as reducing and stabilizing agent and AgNO3 as precursor at ambient temperature within 6 h. Their analysis showed that the Ag NPs are spherical and stable for several weeks and the particle sizes are

Fulleropeptide esters as potential self-assembled antioxidants

• Mira S. Bjelaković,
• Tatjana J. Kop,
• Jelena Đorđević and
• Dragana R. Milić

Beilstein J. Nanotechnol. 2015, 6, 1065–1071, doi:10.3762/bjnano.6.107

• , Keller et al. [18] reported the synthesis of fullerenedihydropyrrole cationic peptides, which did not show antibacterial activity. Neuroprotective and antioxidant properties are based on the fact that fullerene derivatives possess an extended π-bond system, with high electron and free-radical species

Novel ZnO:Ag nanocomposites induce significant oxidative stress in human fibroblast malignant melanoma (Ht144) cells

• Syeda Arooj,
• Samina Nazir,
• Akhtar Nadhman,
• Nafees Ahmad,
• Bakhtiar Muhammad,
• Ishaq Ahmad,
• Kehkashan Mazhar and
• Rashda Abbasi

Beilstein J. Nanotechnol. 2015, 6, 570–582, doi:10.3762/bjnano.6.59

• in the light source used, the percentage of Ag content or the cellular model used. Sharma et al. [32] reported zinc oxide nanoparticles with different formulations (0.1, 0.2, 0.3 and 0.4%) of Ag (size range: 23–59 nm) for their antibacterial activity and Shah et al. [33] reported that ZnO nanorods

Nanobioarchitectures based on chlorophyll photopigment, artificial lipid bilayers and carbon nanotubes

• Marcela Elisabeta Barbinta-Patrascu,
• Stefan Marian Iordache,
• Ana Maria Iordache,
• Nicoleta Badea and
• Camelia Ungureanu

Beilstein J. Nanotechnol. 2014, 5, 2316–2325, doi:10.3762/bjnano.5.240

• radical scavenging ability (affording an antioxidant activity of 73.25%) and enhanced biocidal ability, offering inhibition zones of 12.4, 11.3 and 10.2 mm in diameter, against Escherichia coli, Staphylococcus aureus and Enterococcus faecalis, respectively. Keywords: antibacterial activity; antioxidant

• standard sample at t = 5 s, and I is the maximum CL intensity for a sample at t = 5 s [29]. Three measurements were performed for each sample in order to accurately evaluate the antioxidant activity. Antibacterial assay The antibacterial activity of the samples was tested against Gram-positive and Gram

• ) showed weak antibacterial activity (see Figure 9), offering inhibition zone diameters in the range of 5.0–6.1 mm. However, their biohybrids with carbon nanotubes exhibited enhanced biocidal features due to the presence of SWCNTs, which are known to possess antimicrobial properties [47][48]. Kang et al

Biopolymer colloids for controlling and templating inorganic synthesis

• Laura C. Preiss,
• Katharina Landfester and
• Rafael Muñoz-Espí

Beilstein J. Nanotechnol. 2014, 5, 2129–2138, doi:10.3762/bjnano.5.222

• supercritical CO2 and subsequent calcination. Scaffold templating can also be achieved with starch and even with peptides. Thakore et al. [13] synthesized Cu, Ag, and Cu–Ag alloy nanoparticles in a matrix of starch through a green route and studied the antibacterial activity. Hexagonal silica platelets were

Effect of silver nanoparticles on human mesenchymal stem cell differentiation

• Christina Sengstock,
• Jörg Diendorf,
• Matthias Epple,
• Thomas A. Schildhauer and
• Manfred Köller

Beilstein J. Nanotechnol. 2014, 5, 2058–2069, doi:10.3762/bjnano.5.214

• of Duisburg-Essen, Universitaetsstr. 5-7, 45117 Essen, Germany 10.3762/bjnano.5.214 Abstract Background: Silver nanoparticles (Ag-NP) are one of the fastest growing products in nano-medicine due to their enhanced antibacterial activity at the nanoscale level. In biomedicine, hundreds of products

Antimicrobial properties of CuO nanorods and multi-armed nanoparticles against B. anthracis vegetative cells and endospores

• Pratibha Pandey,
• Merwyn S. Packiyaraj,
• Himangini Nigam,
• Gauri S. Agarwal,
• Beer Singh and
• Manoj K. Patra

Beilstein J. Nanotechnol. 2014, 5, 789–800, doi:10.3762/bjnano.5.91

• , generated on copper foil as effective antibacterial against E. coli bacteria when the bacterial suspension drop was tested on these surfaces. Perelshtein et al. [19] have reported antibacterial CuO-cotton textile against E. coli and S. aureus. Gao et al. [20] reported strong antibacterial activity of CuO

• nanostructures comparable to established antibiotics as well as their photocatalytic potential. However, we have not come across any report on bactericidal potential of CuO nanoparticles against B. anthracis cells and spores. The earlier findings inspired us to evaluate antibacterial activity of noncorrosive CuO

• the graph that PS2 NPs show higher a bactericidal action against non-sporogenic bacteria E. coli in comparison to B. anthracis vegetative cells. The probable reason is discussed later. Figure 3 represents the antibacterial activity of electrochemically synthesized CuO multi-armed NPs (P5) at two

An ultrasonic technology for production of antibacterial nanomaterials and their coating on textiles

• Anna V. Abramova,
• Vladimir O. Abramov,
• Aharon Gedanken,
• Ilana Perelshtein and
• Vadim M. Bayazitov

Beilstein J. Nanotechnol. 2014, 5, 532–536, doi:10.3762/bjnano.5.62

• the surface of textile at very high velocities. Fabrics coated with ZnO nanoparticles by using the developed method showed good antibacterial activity against E. coli. Keywords: antibacterial textile; cavitation; electrical discharge in liquid; nanoparticle; ultrasound; Introduction Currently, the

• analyse the antibacterial properties of the samples comparing their antibacterial activity and the antibacterial activity of samples coated with industrially produced NPs. In the research described in this paper we produced a suspension of zinc oxide NPs in water by using a sonoplasma discharge between

• treatment of textiles in a roll-to-roll mode [7] of operation was used to coat cotton fabrics with ZnO NPs. The testing results of the antibacterial activity of the coated fabric samples are reported and compared with the antibacterial activity of the fabric coated by using the same ultrasonic method [2][7

Photocatalytic antibacterial performance of TiO₂ and Ag-doped TiO₂ against S. aureus. P. aeruginosa and E. coli

• Kiran Gupta,
• R. P. Singh,
• Ashutosh Pandey and
• Anjana Pandey

Beilstein J. Nanotechnol. 2013, 4, 345–351, doi:10.3762/bjnano.4.40

• indirect optical band gap of 3.2 eV, while the rutile phase has a direct band gap of 3.06 eV and an indirect one of 3.10 eV [7]. However, crude nanoparticles are amorphous in nature, with decreased surface area, and show a fast recombination rate of electrons and holes. Finally the antibacterial activity

• acid-catalyzed sol–gel technique. The prepared particles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), ultraviolet visible spectroscopy (UV–vis) and photoluminescence (PL). Furthermore, the antibacterial activity of the TiO2 and Ag-TiO2 nanoparticles were

• killing of the bacteria investigated here. The antibacterial activity of annealed samples is slightly more than crude TiO2, because after annealing at 450 °C the amorphous phase of the nanoparticle is converted to both anatase and rutile phases, and shows an indirect band gap of 3.2 eV, which is similar

Electrospinning preparation and electrical and biological properties of ferrocene/poly(vinylpyrrolidone) composite nanofibers

• Ji-Hong Chai and
• Qing-Sheng Wu

Beilstein J. Nanotechnol. 2013, 4, 189–197, doi:10.3762/bjnano.4.19

• model organisms. The nanofibers fabricated by this method showed obvious antibacterial activity. Electrochemical properties were characterized based on cyclic voltammetry measurements. The CV results showed redox peaks corresponding to the Fc+/Fc couple, which suggested that Fc molecules encapsulated

• a polymer provides different properties compared with applying Fc alone. The incorporation of Fc in a polymeric matrix can improve the dispersion of Fc, increasing the catalyst effect and antibacterial activity of hybrid nanofibers. However, the current reports mainly focus on the preparation and

• fibers became porous and the diameter obviously increased with the distribution ranging from 100 to 200 nm (Figure 1d). The high surface-to-volume ratio improved the antibacterial activity of the composite Fc/PVP nanofiber membrane. As seen from the presented SEM micrographs (Figure 1d), no Fc crystals

Paper modified with ZnO nanorods – antimicrobial studies

• Mayuree Jaisai,
• Sunandan Baruah and
• Joydeep Dutta

Beilstein J. Nanotechnol. 2012, 3, 684–691, doi:10.3762/bjnano.3.78

• and H2O2 are harmful to the cells of living organisms and are the major contributors to antibacterial activity [11][12][13]. ZnO nanoparticles are reported to have significant antifungal properties against B. cinerea and P. expansum, and the inhibitory effects were found to increase with an increase