Physiochemical charge stabilization of silver nanoparticles and its antibacterial applications

Vanitha, G.; Rajavel, Krishnamoorthy; Boopathy, Gopal; Veeravazhuthi, V.; Neelamegam, P.

doi:10.1016/j.cplett.2016.11.037

Cited by 37 publications

(27 citation statements)

References 27 publications

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“…Obviously, the plasmon peak was observed at 404 nm ( figure 2(d)) indicating the presence of nanosized Ag particles, which is in accordance with the aforementioned TEM and DLS results. The zeta potential of the AgNPs was calculated as −27.0 mV, which is closed to previous studies [14,15]. The negatively charged surface of AgNPs could prevent their agglomeration due to generation of repulsion force between AgNPs, and thus, stablizing the polydispersion of AgNPs in their colloidal sollution.…”

Section: Resultscontrasting

confidence: 42%

Fabrication process and characterization of AgNPs/PVA/cellulose as a SERS platform for in-situ detection of residual pesticides in fruit

Thi¹,

Nguyen

Vu³

et al. 2020

Mater. Res. Express

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In this work, AgNPs/PVA/Cellulose was used as a substrate material for surface Raman scattering enhancement. Silver nanoparticles (AgNPs) was synthesized by Lee and Meisel's method with the average particles size of 15.4 nm. Then, this silver colloid was made a homogenous coating on polyvinyl alcohol and cellulose film and structural characteristics of this material were determined using Scanning Electron Microscopy (SEM). The findings demonstrated that the Raman shifts of the pesticide will be identified by the SERS method at 1660 cm −1 , 2234 cm −1 (strong intensity), and at 3077 cm −1 , 1033 cm −1 , 1457 cm −1 (medium intensity) when using the excited laser with wavelength of 532 nm. Under excited laser, the limit of chlorfenapyr detection is 1 ppm (mg l −1 ), allowing determination of chlorfenapyr residue in food. Potential applications identified food samples containing chlorfenapyr residue for rapid detection, low cost, non-destructive nature and minimal sample preparation.

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Section: Resultscontrasting

confidence: 42%

Fabrication process and characterization of AgNPs/PVA/cellulose as a SERS platform for in-situ detection of residual pesticides in fruit

Thi¹,

Nguyen

Vu³

et al. 2020

Mater. Res. Express

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“…Various studies have shown that a coverage of AgNPs in Journal of Nanomaterials human dentin can prevent biofilm formation on the surface of the dentin as well as inhibit bacterial growth around it [18,24]. According to the characterization of AgNPs, it is very well known that particles with zeta potential values between +30 and −30 mV are considered a stable suspension limiting the agglomeration [25,26]. It has been reported that the concentration of AgNO 3 (0.01, 0.1, and 0.5 M) can affect the size of silver nanoparticles (20,25, and 11 nm) and the zeta potential values (−26.37, −37.95, and −28.23, resp.…”

Section: Discussionmentioning

confidence: 99%

“…It has been reported that the concentration of AgNO 3 (0.01, 0.1, and 0.5 M) can affect the size of silver nanoparticles (20,25, and 11 nm) and the zeta potential values (−26.37, −37.95, and −28.23, resp. ); moreover, the pH values in the solution could also promote a high risk of agglomeration when pH values < 7 were used, while pH values > 7 could have better conditions for nonagglomerated particles [26]. Our results from characterization indicate that all AgNP samples had generally good distribution and uniform sizes and shapes, while the potential zeta results suggest that smaller AgNPs could have an increased risk to be agglomerated due to low electrical charge (−19.1 ± 52.5 mV) compared to larger particles (−36.5 ± 5.7 mV), agreeing with other reported studies that found similar results [17,26,27].…”

Section: Discussionmentioning

confidence: 99%

“…); moreover, the pH values in the solution could also promote a high risk of agglomeration when pH values < 7 were used, while pH values > 7 could have better conditions for nonagglomerated particles [26]. Our results from characterization indicate that all AgNP samples had generally good distribution and uniform sizes and shapes, while the potential zeta results suggest that smaller AgNPs could have an increased risk to be agglomerated due to low electrical charge (−19.1 ± 52.5 mV) compared to larger particles (−36.5 ± 5.7 mV), agreeing with other reported studies that found similar results [17,26,27]. It is possible that AgNO 3 concentration and different pH values as well as specific concentrations of gallic acid (stabilizer agent) for each AgNP sample can generate specific electrical charges promoting better properties associated with particle stability.…”

Section: Discussionmentioning

confidence: 99%

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Antiadherence and Antimicrobial Properties of Silver Nanoparticles against Streptococcus mutans on Brackets and Wires Used for Orthodontic Treatments

Espinosa-Cristóbal

López-Ruiz

Cabada-Tarín

et al. 2018

Journal of Nanomaterials

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White spot lesions (WSLs) are very frequent alterations during orthodontic treatments causing demineralization of the dental enamel. Various dental treatments have been developed to prevent WSLs; the prevalence and incidence of these lesions remain significantly high. Although silver nanoparticles (AgNPs) have demonstrated good inhibitory effects against several microorganisms, more studies about antiadherence activity on different orthodontic appliance surfaces are necessary. To determine the inhibitory effect and antiadherence activity of AgNPs on the adhesion of S. mutans on surfaces of brackets and wires for orthodontic therapies, two sizes of AgNPs were prepared and characterized. The evaluation of S. mutans adhesion was performed with microbiological assays on surfaces of brackets and orthodontic modules in triplicate. Topographic characteristics of orthodontic brackets and wires were made by scanning electron and atomic force microscopies. All AgNP samples inhibited S. mutans adhesion; however, the smaller AgNPs had better inhibition than the larger ones. The presence of the module influenced the adhesion of S. mutans but not in the activity of AgNPs. The AgNPs used in this study showed to have good antimicrobial and antiadherence properties against S. mutans bacteria determining its high potential use for the control of WSLs in orthodontic treatments.

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“…45 Furthermore, it has been reported that some nanoparticles using different sizes, well-defined zeta potentials, and other specific physicochemical properties can play an important role in the antimicrobial activity against several bacterial species. 18,19,27,46,47 The CsNPs and AgNPs used in this study were indicated to have good distribution and uniform sizes and shapes, while zeta potentials suggest a low risk to be agglomerated due to high electrical charge in CsNPs (52.0±5.4 mV) and AgNPs (−48.4±6.9 mV) samples promoting better particle stability. [48][49][50] It is possible that CsNPs and AgNPs can produce a wider contact area with particular electrical charge, creating synergistic antimicrobial properties and promoting more contact area on the bacteria cell membrane and, in some cases, having the ability to penetrate into the cell leading to bacterial cell death.…”

Section: Discussionmentioning

confidence: 75%

Antimicrobial activity of endodontic sealers and medications containing chitosan and silver nanoparticles against Enterococcus faecalis

Loyola-Rodríguez

Méndez

Espinosa-Cristóbal

et al. 2019

Journal of Applied Biomaterials & Functional Materials

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Background: The main microorganism associated with the failure of endodontic treatments is Enterococcus faecalis. Although several endodontic therapeutics have demonstrated antimicrobial activity against E. faecalis, the antimicrobial effectiveness of chitosan (CsNPs) and silver nanoparticles (AgNPs) included into conventional endodontic sealers for endodontic therapies is still unclear. Aim: The objective of this study was to evaluate the antibacterial activity increment (AAI) of endodontic sealers containing CsNPs and AgNPs as well as some chemical components against E. faecalis by direct contact assays. Methods: CsNPs and AgNPs were synthesized by reduction and ionic gelation methods, respectively. Nanoparticles were characterized by dynamic light scattering and energy dispersive X-ray analysis. The bactericidal activity was tested on monolayers on agar plates and collagen membrane surface assays against E. faecalis. Results: The size of CsNPs was 70.6±14.8 nm and zeta potential was 52.0±5.4 mV; the size of AgNPs was 54.2±8.5 nm, and zeta potential was –48.4±6.9 mV. All materials, single or combined, showed an AAI, especially when CsNPs, chlorhexidine (Chx), and the combination of CsNPs-Chx were added. However, the combination of CsNPs-Chx showed the highest (55%) AAI, followed by Chx (35.5%) and CsNPs (11.1%), respectively. There was a significant statistical difference in all comparisons ( p < 0.05). Tubliseal (40%) and AH Plus (32%) sealants showed a higher AAI on E. faecalis in the monolayer test and collagen membrane assay analyzed by scanning electron microscopy. Conclusions: Tubliseal and AH plus sealers combined with nanoparticles, especially CsNPs-Chx, could be used for conventional endodontic treatments in the control of E. faecalis bacteria.

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Physiochemical charge stabilization of silver nanoparticles and its antibacterial applications

Cited by 37 publications

References 27 publications

Fabrication process and characterization of AgNPs/PVA/cellulose as a SERS platform for in-situ detection of residual pesticides in fruit

Fabrication process and characterization of AgNPs/PVA/cellulose as a SERS platform for in-situ detection of residual pesticides in fruit

Antiadherence and Antimicrobial Properties of Silver Nanoparticles against Streptococcus mutans on Brackets and Wires Used for Orthodontic Treatments

Antimicrobial activity of endodontic sealers and medications containing chitosan and silver nanoparticles against Enterococcus faecalis

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