Effects of pulsed laser irradiation on gold-coated silver nanoplates and their antibacterial activity

Kyaw, Kaung; Ichimaru, Hiroaki; Kawagoe, Takayuki; Terakawa, Mitsuhiro; Miyazawa, Yuta; Mizoguchi, Daigou; Tsushida, Masayuki; Niidome, Takuro

doi:10.1039/c7nr06513b

Cited by 21 publications

(22 citation statements)

References 19 publications

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“…This shape change is similar to that observed in the gold-coated silver NPLs that we previously reported. 14 Thus, Ag@SiO 2 NPLs melted and changed to a spherical form because of the photothermal effect induced by pulsed laser irradiation. Since spherical silver nanoparticles generally show absorption at about 400 nm, 13 , 14 the color change to yellow shown in Figure 1 is consistent with the shape change to the spherical form by the laser irradiation.…”

Section: Resultsmentioning

confidence: 99%

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Tailored Structure and Antibacterial Properties of Silica-Coated Silver Nanoplates by Pulsed Laser Irradiation

Takeda

Terakawa

et al. 2022

ACS Omega

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We coated triangular-shaped silver nanoparticles, a type of anisotropic nanoplate (NPL), with silica (i.e., prepared Ag@SiO 2 NPLs). When we irradiated Ag@SiO 2 NPLs with nanosecond-pulsed laser light for 10 s, the triangular shape changed to spherical because of the photothermal effect. A high laser power exposed the silver core, and the particles exhibited strong antimicrobial activity. In contrast, at a moderate laser power, the silica layer crystallized, and the particles’ antimicrobial activity decreased. Thus, a combination of Ag@SiO 2 NPLs and an appropriately tuned power of pulsed laser irradiation facilitated a decreased or an increased antimicrobial activity.

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Section: Resultsmentioning

confidence: 99%

“…Concomitantly, silver ions were released from the nanoparticles and exhibited considerable antibacterial activity. 14 Thus, we switched the antibacterial activity from OFF to ON by laser irradiation. Zhu et al also prepared gold-coated silver NPLs and enhanced silver ion release in response to laser irradiation.…”

Section: Introductionmentioning

confidence: 99%

Tailored Structure and Antibacterial Properties of Silica-Coated Silver Nanoplates by Pulsed Laser Irradiation

Takeda

Terakawa

et al. 2022

ACS Omega

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“…Gold-silver alloy nanoparticles have shown their potential to eradicate biofilm and reduce the MICs against Gram-positive and Gram-negative bacteria, which could then be used to circumvent drug resistance ( Ramasamy et al, 2016 ). Kyaw et al (2017) showed that submitting triangular AuNPs coated by silver to laser irradiation, induced a change of shape to spherical and increased the antibacterial activity.…”

Section: Alternative Antibacterial Therapiesmentioning

confidence: 99%

Tackling Multidrug Resistance in Streptococci – From Novel Biotherapeutic Strategies to Nanomedicines

et al. 2020

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The pyogenic streptococci group includes pathogenic species for humans and other animals and has been associated with enduring morbidity and high mortality. The main reason for the treatment failure of streptococcal infections is the increased resistance to antibiotics. In recent years, infectious diseases caused by pyogenic streptococci resistant to multiple antibiotics have been raising with a significant impact to public health and veterinary industry. The rise of antibiotic-resistant streptococci has been associated to diverse mechanisms, such as efflux pumps and modifications of the antimicrobial target. Among streptococci, antibiotic resistance emerges from previously sensitive populations as result of horizontal gene transfer or chromosomal point mutations due to excessive use of antimicrobials. Streptococci strains are also recognized as biofilm producers. The increased resistance of biofilms to antibiotics among streptococci promote persistent infection, which comprise circa 80% of microbial infections in humans. Therefore, to overcome drug resistance, new strategies, including new antibacterial and antibiofilm agents, have been studied. Interestingly, the use of systems based on nanoparticles have been applied to tackle infection and reduce the emergence of drug resistance. Herein, we present a synopsis of mechanisms associated to drug resistance in (pyogenic) streptococci and discuss some innovative strategies as alternative to conventional antibiotics, such as bacteriocins, bacteriophage, and phage lysins, and metal nanoparticles. We shall provide focused discussion on the advantages and limitations of agents considering application, efficacy and safety in the context of impact to the host and evolution of bacterial resistance.

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“…The metallic nanoparticles, especially the silver (Ag) nanoparticles have been demonstrated to be effective antibacterial agents with broad antibacterial activity (Agarwal et al, 2010;Mahmoudi and Serpooshan, 2012;Neibert et al, 2012;Durmus and Webster, 2013;Mei et al, 2013;Shah et al, 2013;Agnihotri et al, 2015;Borrelli et al, 2015;Lim et al, 2015;Kyaw et al, 2017;Ximing et al, 2017;Kim et al, 2018;Liu et al, 2018Liu et al, , 2019Gasmalla et al, 2019;Zhang et al, 2019Zhang et al, , 2020He et al, 2020;Horue et al, 2020;Tong et al, 2020). Silver nanoparticles can increase the permeability of bacterial membrane and cell wall and, penetrate into the cytoplasm.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the methotrexate (MTX) is also included in the nano-carrier to treat the inflammatory reaction associated with bacterial infection (Lebugle et al, 2002;Alam et al, 2017;Yang et al, 2017;Duan and Li, 2018;Trujillo-Nolasco et al, 2019;Sun et al, 2020). To address the aforementioned issues of bare silver nanoparticles, different nano-carriers have been constructed, such as metalorganic frameworks (MOFs) (Ximing et al, 2017;Zhang et al, 2019Zhang et al, , 2020, hybrid metallic nanoparticles (Mahmoudi and Serpooshan, 2012;Durmus and Webster, 2013;Mei et al, 2013;Shah et al, 2013;Agnihotri et al, 2015;Lim et al, 2015;Kyaw et al, 2017;Kim et al, 2018;Liu et al, 2018;Gasmalla et al, 2019;He et al, 2020;Tong et al, 2020) and mesoporous nanoparticles (Liu et al, 2019). However, the above nano-carriers have some drawbacks, for instance, the low drug loading capacity (<10%) (Cai et al, 2015) and the complexity of designing a multicomponent nano-carrier (containing at least the carrier and two or more compounds).…”

Section: Introductionmentioning

confidence: 99%

The Antibacterial Effects of Supermolecular Nano-Carriers by Combination of Silver and Photodynamic Therapy

et al. 2021

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The over-use of antibiotics has promoted multidrug resistance and decreased the efficacy of antibiotic therapy. Thus, it is still in great need to develop efficient treatment strategies to combat the bacteria infection. The antimicrobial photodynamic therapy (aPDT) and silver nanoparticles have been emerged as effective antibacterial methods. However, the silver therapy may induce serious damages to human cells at high concentrations and, the bare silver nanoparticles may rapidly aggregate, which would reduce the antibacterial efficacy. The encapsulation of sliver by nano-carrier is a promising way to avoid its aggregation and facilitates the co-delivery of drugs for combination therapy, which does not require high concentration of sliver to exert antibacterial efficacy. This work constructed a self-assembled supermolecular nano-carrier consisting of the photosensitizers (PSs), the anti-inflammatory agent and silver. The synthesized supermolecular nano-carrier produced reactive oxygen species (ROS) under the exposure of 620-nm laser. It exhibited satisfying biocompatibility in L02 cells. And, this nano-carrier showed excellent antibacterial efficacy in Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) as indicated by bacterial growth and colony formation. Its antibacterial performance is further validated by the bacteria morphology through the scanning electron microscope (SEM), showing severely damaged structures of bacteria. To summary, the supermolecular nano-carrier TCPP-MTX-Ag-NP combining the therapeutic effects of ROS and silver may serve as a novel strategy of treatment for bacterial infection.

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Effects of pulsed laser irradiation on gold-coated silver nanoplates and their antibacterial activity

Cited by 21 publications

References 19 publications

Tailored Structure and Antibacterial Properties of Silica-Coated Silver Nanoplates by Pulsed Laser Irradiation

Tailored Structure and Antibacterial Properties of Silica-Coated Silver Nanoplates by Pulsed Laser Irradiation

Tackling Multidrug Resistance in Streptococci – From Novel Biotherapeutic Strategies to Nanomedicines

The Antibacterial Effects of Supermolecular Nano-Carriers by Combination of Silver and Photodynamic Therapy

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