Green Synthesis of AgNPs Coated Mesoporous Silica Nanoparticles Using Tyrosine as Reducing/Stabilising Agent

Ratirotjanakul, Waranya; Sioloetwong, T; Suteewong, Teeraporn; Tangboriboonrat, Pramuan

doi:10.4028/www.scientific.net/msf.928.89

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…Size, shape, surface chemistry, chemical composition, surface area and crystal structure are all intrinsic NP properties [9,16,72,83]; ionic strength, pH, the presence of natural organic matter and hardness are media-specific properties that affect toxicity of NPs [48,91]. Biofunctionalized AgNPs are used in many applications [33,73]. The effects of this surface functionalization of NPs on their physicochemical characteristics, fate and toxicity to organisms are critical, but not well understood yet [1,78] which warrants further research.…”

Section: Introductionmentioning

confidence: 99%

The toxicity of coated silver nanoparticles to the alga Raphidocelis subcapitata

et al. 2020

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The use of silver nanoparticles (AgNPs) is growing exponentially, especially in consumer products due to their excellent antimicrobial properties. However, concerns are growing on their possible negative effects on environmental and human health. AgNPs from consumer products enter aquatic ecosystems where their physicochemical properties including surface functionalization are critical to their impact on aquatic organisms. The effects of AgNPs coated with three different ligands; tyrosine (T-AgNP), epigallocatechin gallate (E-AgNP) and curcumin (C-AgNP) and Ag + ions on the freshwater green alga Raphidocelis subcapitata were investigated. Stability tests of AgNPs revealed that the coating significantly affects the fate and behaviour of AgNPs. All types of AgNPs tested and ionic silver were found to be toxic to the alga and differential growth inhibition of algae were observed from differently coated AgNPs, with the 48 h EC 50 of C-AgNPs, T-AgNPs and E-AgNPs being 0.155, 0.163 and 0.243 mg L −1 , respectively, in comparison with 0.051 mg L −1 for Ag + ions. Associated Ag in the algae increased with increased concentrations of all AgNPs and Ag + ions and the toxicity positively correlated to the associated Ag content in algae. The antioxidant enzymes glutathione S-transferase and catalase were activated in algal cells by the AgNPs and Ag + ions, but a consistent difference in response was not identified with different concentrations of NPs. This study shows the effects of the surrounding environment and surface functionalization of AgNPs on algae highlighting the importance of considering them in environmental risk assessment of AgNPs.

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Section: Introductionmentioning

confidence: 99%

The toxicity of coated silver nanoparticles to the alga Raphidocelis subcapitata

et al. 2020

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“…For example, for synthesizing Ag and Au NPs, green reducing agents, like citrate, ascorbic acid, and many more, have been explored regularly. Even greener synthesis of Ag NPs on the surface of mesoporous silica nanoparticles have been reported 17 using the simple and environment-friendly approach with tyrosine as the reducing agent. Palem et al 18 fabricated Rhubarb-based Ag NPs and chitosan cross-inked Ag nanocomposites using eco-friendly in situ synthesis in which active ingredients from the Rhubarb extract were attached to Ag NPs.…”

Section: Resultsmentioning

confidence: 99%

Green Nanotechnology-Driven Drug Delivery Assemblies

et al. 2019

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Green nanotechnology incorporates the principles of green chemistry and green engineering to fabricate innocuous and eco-friendly nanoassemblies to combat the problems affecting the human health or environment. Subsequently, amalgamation of green nanotechnology with drug delivery area has actually commenced a new realm of “green nanomedicine”. The burgeoning demand for green nanotechnology-driven drug delivery systems has led to the development of different types of delivery devices, like inorganic (metallic) nanoparticles, quantum dots, organic polymeric nanoparticles, mesoporous silica nanoparticles, dendrimers, nanostructured lipid carriers, solid lipid nanoparticles, etc. The present article deals with a brief account of delivery devices produced from green methods and describes site-specific drug delivery systems (including their pros and cons) and their relevance in the field of green nanomedicine.

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“…Above pH = 10, a significant decrease in zeta-potential values is observed for all types of materials. This is likely due to the deprotonation of all hydroxyl groups on the diatom biosilica surface [52]. Moreover, in this pH region, hybrid silver nanoparticles show high stability due to significant electrostatic repulsions [53].…”

Section: Zeta Potentialmentioning

confidence: 99%

Synthesis and Antimicrobial Activity of 3D Micro–Nanostructured Diatom Biosilica Coated by Epitaxially Growing Ag-AgCl Hybrid Nanoparticles

Bekissanova,

Railean,

Wojtczak

et al. 2023

Biomimetics

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The 3D (three-dimensional) micro–nanostructured diatom biosilica obtained from cultivated diatoms was used as a support to immobilize epitaxially growing AgCl-Ag hybrid nanoparticles ((Ag-AgCl)NPs) for the synthesis of nanocomposites with antimicrobial properties. The prepared composites that contained epitaxially grown (Ag-AgCl)NPs were investigated in terms of their morphological and structural characteristics, elemental and mineral composition, crystalline forms, zeta potential, and photoluminescence properties using a variety of instrumental methods including SEM (scanning electron microscopy), TEM (transmission electron microscopy), EDX (energy-dispersive X-ray spectroscopy), XRD (X-ray powder diffraction), zeta-potential measurement, and photoluminescence spectroscopy. The content of (AgCl-Ag)NPs in the hybrid composites amounted to 4.6 mg/g and 8.4 mg/g with AgClNPs/AgNPs ratios as a percentage of 86/14 and 51/49, respectively. Hybrid nanoparticles were evenly dispersed with a dominant size of 5 to 25 nm in composite with an amount of 8.4 mg/g of silver. The average size of the nanoparticles was 7.5 nm; also, there were nanoparticles with a size of 1–2 nm and particles that were 20–40 nm. The synthesis of (Ag-AgCl)NPs and their potential mechanism were studied. The MIC (the minimum inhibitory concentration method) approach was used to investigate the antimicrobial activity against microorganisms Klebsiella pneumoniae, Escherichia coli, and Staphylococcus aureus. The nanocomposites containing (Ag-AgCl)NPs and natural diatom biosilica showed resistance to bacterial strains from the American Type Cultures Collection and clinical isolates (diabetic foot infection and wound isolates).

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Green Synthesis of AgNPs Coated Mesoporous Silica Nanoparticles Using Tyrosine as Reducing/Stabilising Agent

Cited by 6 publications

References 19 publications

The toxicity of coated silver nanoparticles to the alga Raphidocelis subcapitata

The toxicity of coated silver nanoparticles to the alga Raphidocelis subcapitata

Green Nanotechnology-Driven Drug Delivery Assemblies

Synthesis and Antimicrobial Activity of 3D Micro–Nanostructured Diatom Biosilica Coated by Epitaxially Growing Ag-AgCl Hybrid Nanoparticles

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