Special Issue "Green Synthesis of Nanoparticles and Nanostructured Coatings with Antibacterial Properties"

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: closed (30 April 2021).

Special Issue Editor

Dr. José Miguel García-Martín
E-Mail Website
Guest Editor
Instituto de Micro y Nanotecnología, IMN-CNM, CSIC, Madrid, Spain
Interests: biomaterials, implants; antibacterial coatings; antimicrobial nanoparticles; anticancer nanoparticles; electrical stimulation of cells; magnetron sputtering; magnetic force microscopy; magnetic nanostructures; plasmonic nanostructures

Special Issue Information

Dear Colleagues,

A major problem facing the global health-care system nowadays is the great adaptability that some infectious bacteria have to invade body tissues and colonize biomaterial surfaces. In fact, due to the relentless appearance of antibiotic-resistant bacterial strains, bacterial infections will cause more deaths than all types of cancer together in the year 2050 if the current trend continues.

Nanomaterials are interesting to fight bacterial infections. Due to their small dimensions, nanoparticles can easily interact with bacteria and even penetrate the bacterial membrane. Moreover, they exhibit higher reactivity compared to their respective bulk materials due to their high surface area to volume ratio. On the other hand, nanostructured coatings can inhibit bacterial adhesion (non-fouling surfaces) and even possess antimicrobial agents to destroy a bacterial biofilm.

The fabrication of nanomaterials in a safe, environmentally-friendly and cost-effective manner is of the utmost importance. In particular, a promising approach is given by green chemistry: the use of living organisms (such as bacteria, human cells, fungi or plants), dietary and organic natural compounds (such as coffee, tea, citric or honey extracts, to name a few) and biological waste material coming from industrial plants, as efficient raw materials for the synthesis of nanoparticles.

This Special Issue of Nanomaterials will attempt to cover the recent advancements in the environmentally-friendly production of nanoparticles and nanostructured coatings that exhibit antibacterial properties.

Dr. José Miguel García-Martín
Guest Editor

Manuscript Submission Information

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Keywords

  • Green Nanotechnology
  • Environmentally-friendly Production of Nanomaterials
  • Green Chemistry
  • Bacterial Biofilm
  • Antibacterial Activity
  • Preventing Infection
  • Antifouling Surfaces
  • Combating Infection
  • Antimicrobial Effects

Published Papers (4 papers)

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Research

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Article
Aloe Vera-Mediated Te Nanostructures: Highly Potent Antibacterial Agents and Moderated Anticancer Effects
Nanomaterials 2021, 11(2), 514; https://doi.org/10.3390/nano11020514 - 18 Feb 2021
Cited by 1 | Viewed by 1888
Abstract
Cancer and antimicrobial resistance to antibiotics are two of the most worrying healthcare concerns that humanity is facing nowadays. Some of the most promising solutions for these healthcare problems may come from nanomedicine. While the traditional synthesis of nanomaterials is often accompanied by [...] Read more.
Cancer and antimicrobial resistance to antibiotics are two of the most worrying healthcare concerns that humanity is facing nowadays. Some of the most promising solutions for these healthcare problems may come from nanomedicine. While the traditional synthesis of nanomaterials is often accompanied by drawbacks such as high cost or the production of toxic by-products, green nanotechnology has been presented as a suitable solution to overcome such challenges. In this work, an approach for the synthesis of tellurium (Te) nanostructures in aqueous media has been developed using aloe vera (AV) extracts as a unique reducing and capping agent. Te-based nanoparticles (AV-TeNPs), with sizes between 20 and 60 nm, were characterized in terms of physicochemical properties and tested for potential biomedical applications. A significant decay in bacterial growth after 24 h was achieved for both Methicillin-resistant Staphylococcus aureus and multidrug-resistant Escherichia coli at a relative low concentration of 5 µg/mL, while there was no cytotoxicity towards human dermal fibroblasts after 3 days of treatment. AV-TeNPs also showed anticancer properties up to 72 h within a range of concentrations between 5 and 100 µg/mL. Consequently, here, we present a novel and green approach to produce Te-based nanostructures with potential biomedical applications, especially for antibacterial and anticancer applications. Full article
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Article
Bactericidal and In-Vitro Cytotoxic Efficacy of Silver Nanoparticles (Ag-NPs) Fabricated by Endophytic Actinomycetes and Their Use as Coating for the Textile Fabrics
Nanomaterials 2020, 10(10), 2082; https://doi.org/10.3390/nano10102082 - 21 Oct 2020
Cited by 47 | Viewed by 1617
Abstract
An endophytic strain of Streptomyces antimycoticus L-1 was isolated from healthy medicinal plant leaves of Mentha longifolia L. and used for the green synthesis of silver nanoparticles (Ag-NPs), through the use of secreted enzymes and proteins. UV–vis spectroscopy, Fourier-transform infrared (FT-IR), transmission electron [...] Read more.
An endophytic strain of Streptomyces antimycoticus L-1 was isolated from healthy medicinal plant leaves of Mentha longifolia L. and used for the green synthesis of silver nanoparticles (Ag-NPs), through the use of secreted enzymes and proteins. UV–vis spectroscopy, Fourier-transform infrared (FT-IR), transmission electron microscopy (TEM), X-ray diffraction (XRD), and dynamic light scattering (DLS) analyses of the Ag-NPs were carried out. The XRD, TEM, and FT-IR analysis results demonstrated the successful biosynthesis of crystalline, spherical Ag-NPs with a particle size of 13–40 nm. Further, the stability of the Ag-NPs was assessed by detecting the surface Plasmon resonance (SPR) at 415 nm for one month or by measuring the NPs surface charge (−19.2 mV) by zeta potential analysis (ζ). The green-synthesized Ag-NPs exhibited broad-spectrum antibacterial activity at different concentrations (6.25–100 ppm) against the pathogens Staphylococcus aureus, Bacillus subtilis Pseudomonas aeruginosa, Escherichia coli, and Salmonella typhimurium with a clear inhibition zone ranging from (9.5 ± 0.4) nm to (21.7 ± 1.0) mm. Furthermore, the green-synthesized Ag-NPs displayed high efficacy against the Caco-2 cancerous cell line (the half maximal inhibitory concentration (IC50) = 5.7 ± 0.2 ppm). With respect to antibacterial and in-vitro cytotoxicity analyses, the Ag-NPs concentration of 100 ppm was selected as a safe dose for loading onto cotton fabrics. The scanning electron microscopy connected with energy-dispersive X-ray spectroscopy (SEM-EDX) for the nano-finished fabrics showed the distribution of Ag-NPs as 2% of the total fabric elements. Moreover, the nano-finished fabrics exhibited more activity against pathogenic Gram-positive and Gram-negative bacteria, even after 10 washing cycles, indicating the stability of the treated fabrics. Full article
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Review

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Review
Green Synthesis of Gold and Silver Nanoparticles from Plant Extracts and Their Possible Applications as Antimicrobial Agents in the Agricultural Area
Nanomaterials 2020, 10(9), 1763; https://doi.org/10.3390/nano10091763 - 07 Sep 2020
Cited by 61 | Viewed by 3689
Abstract
Currently, metal nanoparticles have varied uses for different medical, pharmaceutical, and agricultural applications. Nanobiotechnology, combined with green chemistry, has great potential for the development of novel and necessary products that benefit human health, environment, and industries. Green chemistry has an important role due [...] Read more.
Currently, metal nanoparticles have varied uses for different medical, pharmaceutical, and agricultural applications. Nanobiotechnology, combined with green chemistry, has great potential for the development of novel and necessary products that benefit human health, environment, and industries. Green chemistry has an important role due to its contribution to unconventional synthesis methods of gold and silver nanoparticles from plant extracts, which have exhibited antimicrobial potential, among other outstanding properties. Biodiversity-rich countries need to collect and convert knowledge from biological resources into processes, compounds, methods, and tools, which need to be achieved along with sustainable use and exploitation of biological diversity. Therefore, this paper describes the relevant reported green synthesis of gold and silver nanoparticles from plant extracts and their capacity as antimicrobial agents within the agricultural field for fighting against bacterial and fungal pathogens that can cause plant, waterborne, and foodborne diseases. Moreover, this work makes a brief review of nanoparticles’ contribution to water treatment and the development of “environmentally-friendly” nanofertilizers, nanopesticides, and nanoherbicides, as well as presenting the harmful effects of nanoparticles accumulation in plants and soils. Full article
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Review
Flower-Based Green Synthesis of Metallic Nanoparticles: Applications beyond Fragrance
Nanomaterials 2020, 10(4), 766; https://doi.org/10.3390/nano10040766 - 16 Apr 2020
Cited by 27 | Viewed by 2687
Abstract
Green synthesis has gained wide attention as a sustainable, reliable, and eco-friendly approach to the synthesis of a variety of nanomaterials, including hybrid materials, metal/metal oxide nanoparticles, and bioinspired materials. Plant flowers contain diverse secondary compounds, including pigments, volatile substances contributing to fragrance, [...] Read more.
Green synthesis has gained wide attention as a sustainable, reliable, and eco-friendly approach to the synthesis of a variety of nanomaterials, including hybrid materials, metal/metal oxide nanoparticles, and bioinspired materials. Plant flowers contain diverse secondary compounds, including pigments, volatile substances contributing to fragrance, and other phenolics that have a profound ethnobotanical relevance, particularly in relation to the curing of diseases by ‘Pushpa Ayurveda’ or floral therapy. These compounds can be utilized as potent reducing agents for the synthesis of a variety of metal/metal oxide nanoparticles (NPs), such as gold, silver, copper, zinc, iron, and cadmium. Phytochemicals from flowers can act both as reducing and stabilizing agents, besides having a role as precursor molecules for the formation of NPs. Furthermore, the synthesis is mostly performed at ambient room temperatures and is eco-friendly, as no toxic derivatives are formed. The NPs obtained exhibit unique and diverse properties, which can be harnessed for a variety of applications in different fields. This review reports the use of a variety of flower extracts for the green synthesis of several types of metallic nanoparticles and their applications. This review shows that flower extract was mainly used to design gold and silver nanoparticles, while other metals and metal oxides were less explored in relation to this synthesis. Flower-derived silver nanoparticles show good antibacterial, antioxidant, and insecticidal activities and can be used in different applications. Full article
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