Preparation and antibacterial activities of polyaniline/Cu0.05Zn0.95O nanocomposites

Liang, Xiaoxi; Sun, Mengxi; Li, Liangchao; Qiao, Ru; Chen, Keyu; Xiao, Qi; Xu, Feng

doi:10.1039/c2dt11823h

Cited by 115 publications

(46 citation statements)

References 49 publications

(44 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…37 Alternatively, Gram-negative bacteria like E. coli have a special cell membrane structure which possesses an important ability to resist antimicrobial agents. 38 Furthermore, other factors such as nanoparticle diffusion rates may also affect bacterial strain differently. Nevertheless, further studies are required to confirm this and it is beyond the scope of this manuscript.…”

Section: Discussionmentioning

confidence: 99%

Size-dependent antimicrobial properties of CuO nanoparticles against Gram-positive and -negative bacterial strains

Azam

Ahmed²,

Oves³

et al. 2012

IJN

672

237

View full text Add to dashboard Cite

Background: CuO is one of the most important transition metal oxides due to its captivating properties. It is used in various technological applications such as high critical temperature superconductors, gas sensors, in photoconductive applications, and so on. Recently, it has been used as an antimicrobial agent against various bacterial species. Here we synthesized different sized CuO nanoparticles and explored the size-dependent antibacterial activity of each CuO nanoparticles preparation. Methods: CuO nanoparticles were synthesized using a gel combustion method. In this approach, cupric nitrate trihydrate and citric acid were dissolved in distilled water with a molar ratio of 1:1. The resulting solution was stirred at 100°C, until gel was formed. The gel was allowed to burn at 200°C to obtain amorphous powder, which was further annealed at different temperatures to obtain different size CuO nanoparticles. We then tested the antibacterial properties using well diffusion, minimum inhibitory concentration, and minimum bactericidal concentration methods. Results: XRD spectra confirmed the formation of single phase CuO nanoparticles. Crystallite size was found to increase with an increase in annealing temperature due to atomic diffusion. A minimum crystallite size of 20 nm was observed in the case of CuO nanoparticles annealed at 400°C. Transmission electron microscopy results corroborate well with XRD results. All CuO nanoparticles exhibited inhibitory effects against both Gram-positive and -negative bacteria. The size of the particles was correlated with its antibacterial activity. Conclusion: The antibacterial activity of CuO nanoparticles was found to be size-dependent. In addition, the highly stable minimum-sized monodispersed copper oxide nanoparticles synthesized during this study demonstrated a significant increase in antibacterial activities against both Gram-positive and -negative bacterial strains.

show abstract

Section: Discussionmentioning

confidence: 99%

Size-dependent antimicrobial properties of CuO nanoparticles against Gram-positive and -negative bacterial strains

Azam

Ahmed²,

Oves³

et al. 2012

IJN

672

237

View full text Add to dashboard Cite

show abstract

“…The difference in activity against these two nanoparticles could be attributed to the compound present in the metals and the size of nanoparticles obtained might be a reason to high/ low antibacterial activity. A recent study describes, when irradiation applied at 4 kGy without Ag NPs and at 2 kGy with Ag NPs against total aerobic mesophilic bacteria, Enterobacteriaceae, Escherichia coli and Clostridium perfringens shows greater inhibition zones in antimicrobial treatments of the packaging films using Ag NPs impregnation and gamma irradiation [20][21][22]. The CSNL mediated synthesized Ag and Au NPs with bactericidal activity might became an alternative to antibiotics used in fishery and aquaculture industry [22][23][24].…”

Section: Discussionmentioning

confidence: 99%

Synthesis of Silver and Gold Nanoparticles Using Cashew Nut Shell Liquid and Its Antibacterial Activity Against Fish Pathogens

et al. 2013

View full text Add to dashboard Cite

This study reveals a green process for the production of multi-morphological silver (Ag NPs) and gold (Au NPs) nanoparticles, synthesized using an agroindustrial residue cashew nut shell liquid. Aqueous solutions of Ag ? ions for silver and chloroaurate ions for gold were treated with cashew nut shell extract for the formation of Ag and Au NPs. The nano metallic dispersions were characterized by measuring the surface plasmon absorbance at 440 and 546 nm for Ag and Au NPs. Transmission electron microscopy showed the formation of nanoparticles in the range of 5-20 nm for silver and gold with assorted morphologies such as round, triangular, spherical and irregular. Scanning electron microscopy with energy dispersive spectroscopy and X-ray diffraction analyses of the freeze-dried powder confirmed the formation of metallic Ag and Au NPs in crystalline form. Further analysis by Fourier transform infrared spectroscopy provided evidence for the presence of various biomolecules, which might be responsible for the reduction of silver and gold ions. The obtained Ag and Au NPs had significant antibacterial activity, minimum inhibitory concentration and minimum bactericidal concentration on bacteria associated with fish diseases.

show abstract

“…41 The differential sensitivity of bacteria towards CuO nanoparticles depends upon particle size, temperature of synthesis, bacterial cell wall structure, and the degree of contact with organisms with nanoparticles. 42 In our present investigation, the temperature of synthesis of CuO was maintained at 75°C, and the particle size of the nanoparticle was found to be in the range of 2-10 nm sizes when using various concentrations of metal of precursor (1 mM, 2 mM, and 3 mM). Recently, Moloto et al 43 have demonstrated that with an increase in precursor concentration, there was an increase in particle size, and the morphology evolved from spherical submit your manuscript | www.…”

Section: Antibactericidal Testsmentioning

confidence: 99%

Green synthesis of copper oxide nanoparticles using gum karaya as a biotemplate and their antibacterial application

Padil¹,

Černík²

2013

IJN

199

View full text Add to dashboard Cite

Background:Copper oxide (CuO) nanoparticles have attracted huge attention due to catalytic, electric, optical, photonic, textile, nanofluid, and antibacterial activity depending on the size, shape, and neighboring medium. In the present paper, we synthesized CuO nanoparticles using gum karaya, a natural nontoxic hydrocolloid, by green technology and explored its potential antibacterial application. Methods: The CuO nanoparticles were synthesized by a colloid-thermal synthesis process. The mixture contained various concentrations of CuCl 2 ⋅ 2H 2 O (1 mM, 2 mM, and 3 mM) and gum karaya (10 mg/mL) and was kept at 75°C at 250 rpm for 1 hour in an orbital shaker. The synthesized CuO was purified and dried to obtain different sizes of the CuO nanoparticles. The well diffusion method was used to study the antibacterial activity of the synthesized CuO nanoparticles. The zone of inhibition, minimum inhibitory concentration, and minimum bactericidal concentration were determined by the broth microdilution method recommended by the Clinical and Laboratory Standards Institute. Results: Scanning electron microscopy analysis showed CuO nanoparticles evenly distributed on the surface of the gum matrix. X-ray diffraction of the synthesized nanoparticles indicates the formation of single-phase CuO with a monoclinic structure. The Fourier transform infrared spectroscopy peak at 525 cm −1 should be a stretching of CuO, which matches up to the B 2u mode.The peaks at 525 cm −1 and 580 cm −1 indicated the formation of CuO nanostructure. Transmission electron microscope analyses revealed CuO nanoparticles of 4.8 ± 1.6 nm, 5.5 ± 2.5 nm, and 7.8 ± 2.3 nm sizes were synthesized with various concentrations of CuCl 2 ⋅ 2H 2 O (1 mM, 2 mM, and 3 mM). X-ray photoelectron spectroscopy profiles indicated that the O 1s and Cu 2p peak corresponding to the CuO nanoparticles were observed. The antibacterial activity of the synthesized nanoparticles was tested against Gram-negative and positive cultures. Conclusion:The formed CuO nanoparticles are small in size (4.8 ± 1.6 nm), highly stable, and have significant antibacterial action on both the Gram classes of bacteria compared to larger sizes of synthesized CuO (7.8 ± 2.3 nm) nanoparticles. The smaller size of the CuO nanoparticles (4.8 ± 1.6 nm) was found to be yielding a maximum zone of inhibition compared to the larger size of synthesized CuO nanoparticles (7.8 ± 2.3 nm). The results also indicate that increase in precursor concentration enhances an increase in particle size, as well as the morphology of synthesized CuO nanoparticles.

show abstract

Preparation and antibacterial activities of polyaniline/Cu0.05Zn0.95O nanocomposites

Cited by 115 publications

References 49 publications

Size-dependent antimicrobial properties of CuO nanoparticles against Gram-positive and -negative bacterial strains

Size-dependent antimicrobial properties of CuO nanoparticles against Gram-positive and -negative bacterial strains

Synthesis of Silver and Gold Nanoparticles Using Cashew Nut Shell Liquid and Its Antibacterial Activity Against Fish Pathogens

Green synthesis of copper oxide nanoparticles using gum karaya as a biotemplate and their antibacterial application

Contact Info

Product

Resources

About