Activity of catalytic silver nanoparticles modulated by capping agent hydrophobicity

Janani, Seralathan; Stevenson, Priscilla; Veerappan, Anbazhagan

doi:10.1016/j.colsurfb.2014.03.008

Cited by 28 publications

(11 citation statements)

References 22 publications

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“…AgNPs were synthesised from Ag nitrate using N14E as a stabiliser and NaBH 4 as a reducing agent. The colour of the freshly prepared N14E stabilised AgNPs was yellow – the characteristic colour of AgNPs, which is consistent with previous reports [24, 26, 27]. The UV–vis spectra of the AgNPs showed a characteristic surface plasmon resonance (SPR) band at 415 nm.…”

Section: Resultssupporting

confidence: 90%

Evaluation of the toxicities of silver and silver sulfide nanoparticles against Gram‐positive and Gram‐negative bacteria

Subramaniyan

Megarajan

Vijayakumar

et al. 2019

IET nanobiotechnol.

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In this study, the endogenous lipid signalling molecules, N-myristoylethanolamine, were explored as a capping agent to synthesise stable silver nanoparticles (AgNPs) and Ag sulphide NPs (Ag 2 S NPs). Sulphidation of the AgNPs abolishes the surface plasmon resonance (SPR) maximum of AgNPs at 415 nm with concomitant changes in the SPR, indicating the formation of Ag 2 S NPs. Transmission electron microscopy revealed that the AgNPs and Ag 2 S NPs are spherical in shape with a size of 5-30 and 8-30 nm, respectively. AgNPs and Ag 2 S NPs exhibit antimicrobial activity against Gram-positive and Gramnegative bacteria. The minimum inhibitory concentrations (MIC) of 25 and 50 μM for AgNPs and Ag 2 S NPs, respectively, were determined from resazurin microtitre plate assay. At or above MIC, both AgNPs and Ag 2 S NPs decrease the cell viability through the mechanism of membrane damage and generation of excess reactive oxygen species.

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Section: Resultssupporting

confidence: 90%

Evaluation of the toxicities of silver and silver sulfide nanoparticles against Gram‐positive and Gram‐negative bacteria

Subramaniyan

Megarajan

Vijayakumar

et al. 2019

IET nanobiotechnol.

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“…However, the extent of ROS generation is found to be a facet-dependent phenomenon. 36 The CU APNs showed more absorbance than the RD APNs. The absorbance of TH APNs lay in between those of the CU and RD APNs.…”

Section: Results and Discussionmentioning

confidence: 95%

Facet-Dependent Bactericidal Activity of Ag₃PO₄ Nanostructures against Gram-Positive/Negative Bacteria

et al. 2022

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Ag 3 PO 4 nanostructures (APNs) containing silver (Ag metal; of the noble metal families) have the potential to exhibit enzyme-mimetic activity. A nanostructure shape, including its surface facets, can improve the bioactivity of enzyme mimicry, yet the molecular mechanisms remain unclear. Herein, we report facet-dependent peroxidase and oxidase-like activity of APNs with both antibacterial and biofilm degrading properties through the generation of reactive oxygen species. Cubic APNs had superior antibacterial effects than rhombic dodecahedral shapes when inhibiting Gram-positive and Gram-negative bacterial pathogen proliferation and biofilm degradation. A similar performance was observed for rhombic dodecahedral shapes, being greater than tetrahedral-shaped APNs. The extent of enzyme-mimetic activity is attributed to the facets {100} present in cubic APNs that led the peroxide radicals to inhibit the proliferation of bacteria and degrade biofilm. These facets were compared to rhombic dodecahedral APNs {110} and tetrahedral APNs {111}, respectively, to reveal a facet-dependent enhanced antibacterial activity, providing a plausible mechanism for shape-dependent APNs material enzyme-mimetic effects on bacteria. Thus, our research findings can provide a direction to optimize bactericidal materials using APNs in clinically relevant applications.

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“…Earlier, our group reported the synthesis of copper NPs using the milk protein casein as a capping agent [25]. We also reported the synthesis of AgNPs using naturally occurring levan, N-acyl ethanolamine and N-acyl tyramine as reducing and capping agents [26][27][28]. More recently, we reported sunlight mediated rapid synthesis of AgNPs using Desmostachya bipinnata aqueous extract and decoded the role of b-sitosterol-D-glucopyranoside in the synthesis of stable AgNPs [29].…”

Section: Introductionmentioning

confidence: 95%

“…1). The dispersity of the as-prepared AgNPs was analyzed by comparing the full width at half-maximum (FWHM) from the UV-Vis spectra [28]. The FWHM determined for AgNPs prepared by sunlight and room light was 110 nm and 153 nm, respectively.…”

Section: Phyto-protein Mediated Synthesis Of Silver Nanoparticlesmentioning

confidence: 99%

Sunlight mediated synthesis of silver nanoparticles using redox phytoprotein and their application in catalysis and colorimetric mercury sensing

Ahmed

Senthilnathan

Megarajan

et al. 2015

Journal of Photochemistry and Photobiology B: Biology

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Activity of catalytic silver nanoparticles modulated by capping agent hydrophobicity

Cited by 28 publications

References 22 publications

Evaluation of the toxicities of silver and silver sulfide nanoparticles against Gram‐positive and Gram‐negative bacteria

Evaluation of the toxicities of silver and silver sulfide nanoparticles against Gram‐positive and Gram‐negative bacteria

Facet-Dependent Bactericidal Activity of Ag₃PO₄ Nanostructures against Gram-Positive/Negative Bacteria

Sunlight mediated synthesis of silver nanoparticles using redox phytoprotein and their application in catalysis and colorimetric mercury sensing

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Activity of catalytic silver nanoparticles modulated by capping agent hydrophobicity

Cited by 28 publications

References 22 publications

Evaluation of the toxicities of silver and silver sulfide nanoparticles against Gram‐positive and Gram‐negative bacteria

Evaluation of the toxicities of silver and silver sulfide nanoparticles against Gram‐positive and Gram‐negative bacteria

Facet-Dependent Bactericidal Activity of Ag3PO4 Nanostructures against Gram-Positive/Negative Bacteria

Sunlight mediated synthesis of silver nanoparticles using redox phytoprotein and their application in catalysis and colorimetric mercury sensing

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Facet-Dependent Bactericidal Activity of Ag₃PO₄ Nanostructures against Gram-Positive/Negative Bacteria