Antimicrobial activity of nano-sized silver colloids stabilized by nitrogen-containing polymers: the key influence of the polymer capping

Batista, Carin C. S.; Albuquerque, Lindomar J. C.; Araujo, Iris de; Albuquerque, Brunno L.; Silva, Fernanda Dias da; Giacomelli, Fernando C.

doi:10.1039/c7ra13597a

Cited by 38 publications

(25 citation statements)

References 51 publications

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“…Silver ions were also reported to induce reactive oxygen species in bacteria which leads to the destruction of the bacterial cell ( Meena et al, 2013 ; Shaikh et al, 2019 ). It has been reported that the antimicrobial activity of Ag-NPs was enhanced by the combination of polymer even at low concentrations ( Chen et al, 2016 ; Abbas et al, 2018 ; Batista et al, 2018 ). Chitosan, a cationic polysaccharide was used along with Ag-NPs to improve the antimicrobial properties of NPs ( Abdelgawad et al, 2014 ).…”

Section: Role Of Nanotechnology In Crop Protectionmentioning

confidence: 99%

Endophytic Nanotechnology: An Approach to Study Scope and Potential Applications

et al. 2021

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Nanotechnology has become a very advanced and popular form of technology with huge potentials. Nanotechnology has been very well explored in the fields of electronics, automobiles, construction, medicine, and cosmetics, but the exploration of nanotecnology’s use in agriculture is still limited. Due to climate change, each year around 40% of crops face abiotic and biotic stress; with the global demand for food increasing, nanotechnology is seen as the best method to mitigate challenges in disease management in crops by reducing the use of chemical inputs such as herbicides, pesticides, and fungicides. The use of these toxic chemicals is potentially harmful to humans and the environment. Therefore, using NPs as fungicides/ bactericides or as nanofertilizers, due to their small size and high surface area with high reactivity, reduces the problems in plant disease management. There are several methods that have been used to synthesize NPs, such as physical and chemical methods. Specially, we need ecofriendly and nontoxic methods for the synthesis of NPs. Some biological organisms like plants, algae, yeast, bacteria, actinomycetes, and fungi have emerged as superlative candidates for the biological synthesis of NPs (also considered as green synthesis). Among these biological methods, endophytic microorganisms have been widely used to synthesize NPs with low metallic ions, which opens a new possibility on the edge of biological nanotechnology. In this review, we will have discussed the different methods of synthesis of NPs, such as top-down, bottom-up, and green synthesis (specially including endophytic microorganisms) methods, their mechanisms, different forms of NPs, such as magnesium oxide nanoparticles (MgO-NPs), copper nanoparticles (Cu-NPs), chitosan nanoparticles (CS-NPs), β-d-glucan nanoparticles (GNPs), and engineered nanoparticles (quantum dots, metalloids, nonmetals, carbon nanomaterials, dendrimers, and liposomes), and their molecular approaches in various aspects. At the molecular level, nanoparticles, such as mesoporous silica nanoparticles (MSN) and RNA-interference molecules, can also be used as molecular tools to carry genetic material during genetic engineering of plants. In plant disease management, NPs can be used as biosensors to diagnose the disease.

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Section: Role Of Nanotechnology In Crop Protectionmentioning

confidence: 99%

Endophytic Nanotechnology: An Approach to Study Scope and Potential Applications

et al. 2021

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“…In other case, the reducing substance can play the role of a reducing agent and a ligand, which forms a complex compound with the available metal ion. It is typical for reducing polymers including a nitrogen atom as heteroatom, e.g., poly(vinylpyrrolidone) (PVP), polyethylenimine (PEI), or polyaniline (PANI) [168][169][170][171][172][173][174]. Such a formation of a complex compound is widely applied in practice for the tailored preparation of metal nanoparticles.…”

Section: Preparation Of Metal Nanoparticles By Chemical Reduction: Romentioning

confidence: 99%

Physicochemical Aspects of Metal Nanoparticle Preparation

Kvı́tek¹,

Prucek²,

Panáček³

et al. 2020

Engineered Nanomaterials - Health and Safety

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Physicochemical properties, including optical properties or catalytic activity, and biological properties of metal nanoparticles are considerably influenced by their diameter. Therefore, a tailored synthesis of metal nanoparticles represents a key topic in the field of nanotechnology, and the number of research papers, concerning this topic, has been annually growing with an arithmetic progression. Metal nanoparticles are most frequently prepared via chemical reduction of metals in ionic form from their solutions. Using this synthetic approach, tailored parameters of the particles can be achieved via the adjustment of numerous factors: difference of potentials of the metal redox system and the reducing agent redox system, pH of the reaction mixture, and its temperature. The influence of these three factors on the diameter of the prepared metal nanoparticles will be discussed in the following chapter with respect to general laws and based on numerous examples from research practice.

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“…Polymer capping has been studied for stabilizing nanomaterials at small sizes [18–19] . Likewise, some polymer have been used as capping agents to control the size of PB NPs, such as polyvinylpyrrolidone (PVP), which was used to encapsulate the PB NPs during synthesis to form stable core‐shell PB@PVP NPs [20] .…”

Section: Introductionmentioning

confidence: 99%

Size‐Dependent and Self‐Catalytic Gold@Prussian Blue Nanoparticles for the Electrochemical Detection of Hydrogen Peroxide

Zhang

Engelbrekt

et al. 2020

ChemElectroChem

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Prussian blue (PB) nanoparticle (NP)-based nanomaterials have become a subject of intense interest, because of their intriguing physical and chemical properties that differ from their bulk counterparts, leading to novel applications in electrocatalysis. However, the size effect of PB NPs on the electrocatalytic performance is still ambiguous and hinders further applications for the study of biomimetic sensors. In this work, a new approach to synthesize core-shell Au@PB NPs is presented, using gold nanoparticles as catalysts for the fabrication of size-controllable, highly stable, water-soluble, biologically compatible and highly electrochemically active PB NPs. As a result, all sizes of Au@PB NPs display high electrochemical activity towards peroxidase biomimicry. Furthermore, the size effect of PB-based electrocatalysis has been investigated, showing the best performance for 18 nm Au@PB NPs. This insight could be used for the design and application of PBbased nanomaterials in biosensors.

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Antimicrobial activity of nano-sized silver colloids stabilized by nitrogen-containing polymers: the key influence of the polymer capping

Cited by 38 publications

References 51 publications

Endophytic Nanotechnology: An Approach to Study Scope and Potential Applications

Endophytic Nanotechnology: An Approach to Study Scope and Potential Applications

Physicochemical Aspects of Metal Nanoparticle Preparation

Size‐Dependent and Self‐Catalytic Gold@Prussian Blue Nanoparticles for the Electrochemical Detection of Hydrogen Peroxide

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