RETRACTED ARTICLE: Biosynthesis of colloidal silver nanoparticles: Their characterization and potential antibacterial activity

Asha, S.; Madhukumar, R.; Satish, S.; Narayana, B.; Byrappa, K.; Wang, Youjiang; Sangappa, Y.

doi:10.1007/s13233-016-4086-5

Cited by 33 publications

(7 citation statements)

References 43 publications

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“…A number of Bragg reflections with 2θ values of 19.017°, 28.348°, 30.894°, 32.337°, 38.079° were observed corresponding to (001), (001), (003), (001) and (002) planes, documenting a typical XRD pattern of AgNPs in the range of 0–80° with Philips Analytical X-Ray. The phase purity and composition of the ZnONPs examined by XRD shows a typical XRD pattern of ZnONPs appeared in the range of 30–80° at a scanning step of 0.01 [ 42 ]. Figure 6 C shows a typical XRD pattern of TiO 2 NPs appeared in the range of 30–80°.…”

Section: Resultsmentioning

confidence: 99%

“…This study involved biosynthesis of AgNPs, ZnONPs and TiO 2 NP by Aspergillus sp. and Fusarium [ 42 ]. Manipulated conditions favored the activity resulting in the production of metal NPs and NCs.…”

Section: Discussionmentioning

confidence: 99%

“…After Sonication 500 µLAgNPs-500 µLZnONPs (A,B) 250 µLZnONPs-750 µLAgNPs (C,D) 750µLTiO2NPs-250µLZnONPs (E,F) 001) and (002) planes, documenting a typical XRD pattern of AgNPs in the range of 0-80 • with Philips Analytical X-Ray. The phase purity and composition of the ZnONPs examined by XRD shows a typical XRD pattern of ZnONPs appeared in the range of 30-80 • at a scanning step of 0.01 [42]. Figure 6C shows…”

Section: Before Sonicationmentioning

confidence: 99%

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Interactive Effects of Biosynthesized Nanocomposites and Their Antimicrobial and Cytotoxic Potentials

et al. 2021

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The present study investigated the biosynthesis of silver (AgNPs), zinc oxide (ZnONPs) and titanium dioxide (TiO2NPs) nanoparticles using Aspergillusoryzae, Aspergillusterreus and Fusariumoxysporum. Nanocomposites (NCs) were successfully synthesized by mixing nanoparticles using a Sonic Vibra-Cell VC/VCX processor. A number of analytical techniques were used to characterize the synthesized biological metal nanoparticles. Several experiments tested biologically synthesized metal nanoparticles and nanocomposites against two types of human pathogenic bacteria, including Gram-positive Staphylococcus aureusand methicillin-resistant Staphylococcus aureus (MRSA), and Gram-negative Escherichia coli and Pseudomonasaeruginosa. Additionally, the antitumor activity in HCT-116 cells (colonic carcinoma) was also evaluated. Significant antimicrobial effects of various synthesized forms of nanoparticles and nanocomposites against E. coli and P. aeruginosa bacteria were detected. Various synthesized biogenic forms of nanoparticles and nanocomposite (9.0 to 29 mm in diameter) had high antibacterial activity and high antitumor activity against HCT-116 cells (colonic carcinoma) with IC50 values of 0.7–100 µg/mL. Biosynthesized NPs are considered an alternative to large-scale biosynthesized metallic nanoparticles and nanocomposites, are simple and cost effective, and provide stable nanomaterials.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Before Sonicationmentioning

confidence: 99%

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Interactive Effects of Biosynthesized Nanocomposites and Their Antimicrobial and Cytotoxic Potentials

et al. 2021

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“…Another fact is that the DNA has phosphorus and sulphur as its major constituents; the AgNPs can react with soft bases and damage the DNA, which would ultimately lead to cell death as shown in Fig. 7 [26][27][28][29][30][31][32][33].…”

Section: Antibacterial Activitymentioning

confidence: 99%

Phytochemical mediated synthesis of silver nanoparticles and their antibacterial activity

Dogiparthi

Sana

Shaik³

et al. 2021

SN Appl. Sci.

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In this present work, we described a bio-reduction method for the generation of silver nanoparticles (AgNPs) using aqueous leaf extract of Micrargeria wightii (M. wightii), which is a gifted alternative to other physicochemical routes. The prepared AgNPs were characterized by UV–visible spectroscopy (UV–vis), Fourier Transform Infrared Spectroscopy (FT-IR), X-ray diffraction (X-RD), Transmission Electron Microscopy (TEM) with EDX and Dynamic light scattering (DLS). UV–visible spectrum showed a characteristic absorption peak at 440 nm of synthesized AgNPs. FT-IR analysis confirmed the existence of plant metabolites, which are responsible for the reduction of Ag (I) ions into Ag (0) NPs. X-RD pattern studies confirm the presence of the pure face-centered cubiccrystalline nature of Ag. Energy-dispersive X-ray (E-DX) spectrum showed the elemental composition of synthesized nanoparticles. Furthermore, TEM images confirm the formation of spherical shaped nano-silver particles with sizes ranging from 30 to 70 nm and supported by particle size analyzer, Dynamic Light Scattering (DLS). Thus, the present investigation provides an easy, eco-friendly and straightforward route for the synthesis of the antibacterial agent against Bacillus subtilis subtilis and Pseudomonas aeruginosa, with 15 and 13 mm zone of inhibition (ZOI) respectively.

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“…Silver (Ag) and Ag nanoparticles exhibit a wide spectrum of oligodynamic actions against bacteria, viruses and fungi with a relatively low risk of developing resistance against the metal, and can be easily synthesised [10][11][12][13]. Hence, Ag has been studied widely for its application, which include forming biomaterial nanocomposite with HA and polymers [14][15][16] or incorporated into HA to form a single phase material for excellent antibacterial property [17,18].…”

Section: Introductionmentioning

confidence: 99%

A functional apatite with antibacterial efficacy for bone tissue infections

Lim

Tong

Ho³

et al. 2019

J. Phys. Mater.

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Silver, silicon co-substituted hydroxyapatite (Ag, Si-HA) was developed to provide bone repair coupled with antibacterial effect, with the aim to address the problems arise in the treatment of bone tissue infections. In this study, Ag, Si-HA demonstrated substantially reduced attachment of Staphylococcus aureus, Propionibacterium acnes, Escherichia coli, and Pseudomonas aeruginosa as compared to HA at 12 h. Being a prolific opportunistic pathogen in bone tissue infections, we investigated if P. aeruginosa could develop resistance against Ag, Si-HA. Our study showed that despite repeated exposure to fresh population of P. aeruginosa every 48 h, Ag, Si-HA exhibited effective antibacterial properties against the growth of P. aeruginosa over 168 h, indicating low risk of inducing bacterial resistance against Ag, Si-HA. As P. aeruginosa produces exotoxins and harbours endotoxins on its cell call, together these toxins could delay healing process. We therefore examined if the effect of these toxins released by P. aeruginosa during the antibacterial assessment on the attachment of mesenchymal stem cells on HA and Ag, Si-HA. Unlike HA, cell attachment on Ag, Si-HA was not affected by the addition of supernatant obtained from the antibacterial assessment of HA and Ag, Si-HA. This demonstrated that Ag, Si-HA could inhibit the growth of bacteria as well as minimise or prevent the detrimental effect from bacteria toxins.

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RETRACTED ARTICLE: Biosynthesis of colloidal silver nanoparticles: Their characterization and potential antibacterial activity

Cited by 33 publications

References 43 publications

Interactive Effects of Biosynthesized Nanocomposites and Their Antimicrobial and Cytotoxic Potentials

Interactive Effects of Biosynthesized Nanocomposites and Their Antimicrobial and Cytotoxic Potentials

Phytochemical mediated synthesis of silver nanoparticles and their antibacterial activity

A functional apatite with antibacterial efficacy for bone tissue infections

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