Silver-decorated gel-shell nanobeads: physicochemical characterization and evaluation of antibacterial properties

• Marta Bartel,
• Katarzyna Markowska,
• Marcin Strawski,
• Krystyna Wolska and
• Maciej Mazur

Beilstein J. Nanotechnol. 2020, 11, 620–630, doi:10.3762/bjnano.11.49

• sulfonate beads modified with polyaniline followed by decoration with silver nanoparticles and demonstrated the considerable antibacterial activity of this material [24]. While the number of works on hybrid polymer/nanoparticle structures and their antibacterial activity is relatively limited, a great

• have been partially reduced to thiol moieties. In consequence, the thiols interact with the silver nanoparticles anchoring them in the gel layer on the nanobeads. Moreover, it has been shown that the nanocomposite exhibits considerable antibacterial activity, comparable or superior to that of non

• composite particles (the Ag nanoparticles are coordinated to thiol groups generated in situ during the synthesis), in a simple and relatively fast reaction. Antibacterial activity of PSSAg nanocomposite We were further interested whether the silver-modified beads show antibacterial effects. To determine the

Luminescent gold nanoclusters for bioimaging applications

• Nonappa

Beilstein J. Nanotechnol. 2020, 11, 533–546, doi:10.3762/bjnano.11.42

• that assists better binding. Zhu et al. reported a rigid host–guest assembly to improve the PL of AuNCs, their antibacterial activity and bioimaging [84]. In their work, 5-methyl-2-thiouracil (MTU)-capped AuNCs (Au-MTU) were prepared. The Au-MTU NCs were then treated with protamine (Prot), a cationic

Facile biogenic fabrication of hydroxyapatite nanorods using cuttlefish bone and their bactericidal and biocompatibility study

• Satheeshkumar Balu,
• Manisha Vidyavathy Sundaradoss,
• Swetha Andra and
• Jaison Jeevanandam

Beilstein J. Nanotechnol. 2020, 11, 285–295, doi:10.3762/bjnano.11.21

• a concentration-mediated hemolytic effect. These biogenic CB-Hap NRs with improved physicochemical properties, blood compatibility and antibacterial efficacy could be highly beneficial for orthopedic applications in the future. Keywords: antibacterial activity; biocompatibility; bone implant

• responsible for hemolysis by aggregating red blood cells (RBCs) via bridging force mediated electrostatic interaction [54]. Thus, the hemolytic effect of CB-Hap NRs at high concentration can be reduced by optimizing their surface charge in the future. Antibacterial activity Generally, bacterial colonies can

• can be noted from the literature that nanometer-sized Hap can effectively inhibit antibacterial activity but only when doped or cationic-substituted [55][56]. In contrast, the CB-derived Hap nanorods in the present study show optimum bactericidal effect on E. coli and S. aureus due to the size (>50 nm

Novel hollow titanium dioxide nanospheres with antimicrobial activity against resistant bacteria

• Carol López de Dicastillo,
• Cristian Patiño,
• María José Galotto,
• Yesseny Vásquez-Martínez,
• Claudia Torrent,
• Daniela Alburquenque,
• Alejandro Pereira and
• Juan Escrig

Beilstein J. Nanotechnol. 2019, 10, 1716–1725, doi:10.3762/bjnano.10.167

• molecules and proteins of the cellular membrane and a lower amount of substance [2][43][44]. In this work, the evaluation of the antibacterial activity of CSTiO2 with a spherical morphology and nanoscale-thickness of approximately 17 nm was evaluated and compared with traditional TiO2 NPs. The reduction of

• thickness of these nanostructures was obtained by reducing the cycles of deposition during the ALD process [18][45][46]. The antibacterial activity of CSTiO2 and TiO2 NPs was evaluated by the inhibition of growth of Staphylococcus aureus (control strain ATCC®6538TM and resistant strain MRSA 97-7 and MRSA

• 622-4) and Escherichia coli (control strain ATCC®25922TM and resistant strain E. coli 33.1). When the analysis was done using control strains, the results in Table 1 indicate that CSTiO2 presented an improved antibacterial activity against S. aureus and a similar activity against E. coli in comparison

Photoactive nanoarchitectures based on clays incorporating TiO₂ and ZnO nanoparticles

• Eduardo Ruiz-Hitzky,
• Pilar Aranda,
• Marwa Akkari,
• Nithima Khaorapapong and
• Makoto Ogawa

Beilstein J. Nanotechnol. 2019, 10, 1140–1156, doi:10.3762/bjnano.10.114

• materials that have been assembled at the nanometer scale with clay silicates and deeply investigated due to their useful properties for various applications, including heterogeneous photocatalysis, antibacterial activity, and water splitting [12][13][14][15][16][17][18][19][20]. Both semiconducting solids

• semiconductors such as ZnO are increasingly investigated for processes concerning environmental remediation, antibacterial activity and chemical technologies for hydrogen production and synthesis of organic compounds [22]. Anyway, according to WoS, in the given period TiO2 NPs appear to be cited ten times more

• challenges are developments regarding applications related to antibacterial activity and uses in the production of fine chemicals through photo-assisted organic syntheses. The use as films and membranes appears as a valuable alternative for industrial processes. Moreover, the clays can be used as substrates

The systemic effect of PEG-nGO-induced oxidative stress in vivo in a rodent model

• Qura Tul Ain,
• Samina Hyder Haq,
• Abeer Alshammari,
• Moudhi Abdullah Al-Mutlaq and
• Muhammad Naeem Anjum

Beilstein J. Nanotechnol. 2019, 10, 901–911, doi:10.3762/bjnano.10.91

• a chitosan 3D scaffold and enhanced its bioactivity, mechanical properties, and pore formation with GO for optimal bone tissue engineering [15]. Zhang et al. improved the chemotherapy efficacy of anticancer drugs with polyethyleneimine (PEI)-grafted GO [16]. Liu et al. discussed the antibacterial

• activity of GO [17]. Moreover, GO-based sensors have been used for the detection of neonicotinoids [18], tyrosine [19], ascorbic acid, dopamine, uric acid [20], 4-nitrophenol [21], and glucose [22]. Among all biocompatible polymers, PEG has been extensively used as a GO cover. Feng et al. used PEG and PEI

Noble metal-modified titania with visible-light activity for the decomposition of microorganisms

• Maya Endo,
• Zhishun Wei,
• Kunlei Wang,
• Baris Karabiyik,
• Kenta Yoshiiri,
• Paulina Rokicka,
• Bunsho Ohtani,
• Agata Markowska-Szczupak and
• Ewa Kowalska

Beilstein J. Nanotechnol. 2018, 9, 829–841, doi:10.3762/bjnano.9.77

• albicans (C. albicans)) activity under visible-light irradiation and in the dark using disk diffusion, suspension, colony growth (“poisoned food”) and sporulation methods. It was found that silver-modified titania, besides remarkably high antibacterial activity (inhibition of bacterial proliferation

• found that silver-modified titania showed superior antibacterial activity, whereas gold-modified samples were very active against fungi, suggesting that bimetallic photocatalysts containing both gold and silver should exhibit excellent antimicrobial properties. Keywords: antifungal properties

• surprising, due to a decrease in charge-carrier recombination since noble metals work as an electron sink [54]. The most interesting finding was a significant enhancement of activity under vis irradiation and in the dark. Under vis irradiation the antibacterial activity was increased four times for ST01 and

BN/Ag hybrid nanomaterials with petal-like surfaces as catalysts and antibacterial agents

• Konstantin L. Firestein,
• Denis V. Leybo,
• Alexander E. Steinman,
• Andrey M. Kovalskii,
• Andrei T. Matveev,
• Anton M. Manakhov,
• Irina V. Sukhorukova,
• Pavel V. Slukin,
• Nadezda K. Fursova,
• Sergey G. Ignatov,
• Dmitri V. Golberg and
• Dmitry V. Shtansky

Beilstein J. Nanotechnol. 2018, 9, 250–261, doi:10.3762/bjnano.9.27

• whole duration of testing (14 days), the maximum concentration of Ag+ ions was 90 ppb (CVD BN/Ag HNMs) and 110 ppb (UV BN/Ag HNMs). Antibacterial activity The antibacterial activity of BN/Ag HNMs obtained via CVD was first studied using the inhibition zone method. The diameter of all discs with tested

• associated with the appearance of bacterial cell resistivity to low Ag+ ion concentration. Then, the antibacterial activity of the BN/Ag HNMs was evaluated against planktonic E. coli bacteria. After incubation for 3 h, the number of CFUs in the presence of both types of BN/Ag HNMs decreased to zero (Figure

•  9d, lines 3 and 4), whereas control and BN NP samples did not show any antibacterial effect (Figure 9d, curves 1 and 2). In order to estimate the antibacterial activity of the BN/Ag HNMs at the early stage of biofilm formation, the coupon method was used. The obtained results show that, unlike the

Evaluating the toxicity of TiO₂-based nanoparticles to Chinese hamster ovary cells and Escherichia coli: a complementary experimental and computational approach

• Alicja Mikolajczyk,
• Natalia Sizochenko,
• Ewa Mulkiewicz,
• Anna Malankowska,
• Michal Nischk,
• Przemyslaw Jurczak,
• Seishiro Hirano,
• Grzegorz Nowaczyk,
• Adriana Zaleska-Medynska,
• Jerzy Leszczynski,
• Agnieszka Gajewicz and
• Tomasz Puzyn

Beilstein J. Nanotechnol. 2017, 8, 2171–2180, doi:10.3762/bjnano.8.216

• nanoparticles, electron/hole (e−/h+) pairs can be generated under UV light. Under such conditions, free radicals are produced, which is one of the major pathways of the antibacterial activity of TiO2-based NPs. In the absence of UV light, photoactive TiO2 nanomaterials demonstrate little or no bacteria

• ions. For instance, TiO2 NPs doped with either copper (Cu) or silver (Ag), exhibited enhanced antibacterial activity against Staphylococcus aureus, whereas their toxicity towards mouse cells from L929 cell line remained low [19]. Ag-TiO2 NPs, which were activated by UV–vis light, exhibited stronger

• three independent experiments and expressed as the percentage of the viability of exposed cells vs controls. Concentration–response curves were fitted using the nonlinear least-squares method. Calculations were carried out with the R environment (http://www.r-project.org). Antibacterial activity The

Bi-layer sandwich film for antibacterial catheters

• Gerhard Franz,
• Florian Schamberger,
• Hamideh Heidari Zare,
• Sara Felicitas Bröskamp and
• Dieter Jocham

Beilstein J. Nanotechnol. 2017, 8, 1982–2001, doi:10.3762/bjnano.8.199

• thick coatings, although they have definitely passed the state of islands and have already coalesced [50]. This larger surface area should increase the release rate and therefore the antibacterial activity. PPX by CVD Surface polymerization vs volume polymerization The silver depot is capped by a layer

Preparation of alginate–chitosan–cyclodextrin micro- and nanoparticles loaded with anti-tuberculosis compounds

• Albert Ivancic,
• Fliur Macaev,
• Fatma Aksakal,
• Veaceslav Boldescu,
• Serghei Pogrebnoi and
• Gheorghe Duca

Beilstein J. Nanotechnol. 2016, 7, 1208–1218, doi:10.3762/bjnano.7.112

• addition to this, ISN has an antibacterial effect against gram-positive bacteria (B. cereus, C. tuberculostearicum, S. aureus MR, S. haemolyticus, S. hominis, and S. salivarius) confirmed by numerous reports on its antibacterial activity [21][22][23][24][25]. The antibacterial activity of ISN has been

Microwave solvothermal synthesis and characterization of manganese-doped ZnO nanoparticles

• Jacek Wojnarowicz,
• Roman Mukhovskyi,
• Elzbieta Pietrzykowska,
• Sylwia Kusnieruk,
• Jan Mizeracki and
• Witold Lojkowski

Beilstein J. Nanotechnol. 2016, 7, 721–732, doi:10.3762/bjnano.7.64

• , varistors, TFT display windows and laser technology [5][6][7]. ZnO displays pyroelectric and piezoelectric properties, thanks to which it is used in electroacoustic devices [8]. It is a biocompatible material used for producing biosensors and in drug delivery applications [9]. Thanks to antibacterial

• activity, matting and hiding properties, as well as bleaching properties, it is applied in the pharmaceutical and cosmetic industry to produce creams, dressings, powders, baby powders and toothpastes. In paediatric dentistry, it is the primary ingredient of the temporary filling material [10]. It is also a

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