scholarly journals Correction to: Sustainable synthesis of silver nanoparticles using various biological sources and waste materials: a review

2021 ◽  
Author(s):  
Deepak Sharma ◽  
Sehaj Singh Gulati ◽  
Nitish Sharma ◽  
Abhishek Chaudhary
Keyword(s):  
Silver Nanoparticles ◽  
Waste Materials ◽  
Biological Sources

Synthesis of Silver Nanoparticles and their Biomedical Applications - A Comprehensive Review

2019 ◽  
Vol 25 (24) ◽  
pp. 2650-2660 ◽  
Author(s):  
Rajasree Shanmuganathan ◽  
Indira Karuppusamy ◽  
Muthupandian Saravanan ◽  
Harshiny Muthukumar ◽  
Kumar Ponnuchamy ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Biomedical Applications ◽  
Antibacterial Agents ◽  
Cost Effective ◽  
Metallic Silver ◽  
Synthesis Methods ◽  
Burn Wound ◽  
Chemical Methods ◽  
Biological Sources ◽  
Physical And Chemical

Generally, silver is considered as a noble metal used for treating burn wound infections, open wounds and cuts. However, the emerging nanotechnology has made a remarkable impact by converting metallic silver into silver nanoparticles (AgNPs) for better applications. The advancement in technology has improved the synthesis of NPs using biological method instead of physical and chemical methods. Nonetheless, synthesizing AgNPs using biological sources is ecofriendly and cost effective. Till date, AgNPs are widely used as antibacterial agents; therefore, a novel idea is needed for the successful use of AgNPs as therapeutic agents to uncertain diseases and infections. In biomedicine, AgNPs possess significant advantages due to their physical and chemical versatility. Indeed, the toxicity concerns regarding AgNPs have created the need for non-toxic and ecofriendly approaches to produce AgNPs. The applications of AgNPs in nanogels, nanosolutions, silver based dressings and coating over medical devices are under progress. Still, an improvised version of AgNPs for extended applications in an ecofriendly manner is the need of the hour. Therefore, the present review emphasizes the synthesis methods, modes of action under dissipative conditions and the various biomedical applications of AgNPs in detail.

Marine Actinomycetes Derived Pyrrolo Compounds Mediated Green Synthesis of AgO and Ag2O3 Nanoparticles and its Antidermatophytic Activity

2020 ◽  
Vol 10 (6) ◽  
pp. 868-875
Author(s):  
Lokesh Ravi ◽  
Riven Chocalingam ◽  
Vignesh Menta ◽  
Kannabiran Krishnan
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Xrd Analysis ◽  
Marine Actinomycetes ◽  
Green Catalyst ◽  
Characterization Methods ◽  
Silver Oxide Nanoparticles ◽  
Biological Sources ◽  
Anti Fungal ◽  
Antidermatophytic Activity

Background: Antimicrobial potential of silver nanoparticles synthesised by using various biological sources was already been reported by many researchers. The green synthesis of silver nanoparticles using microbial sources has been proved to be more effective. Methods: In this study, anti-dermatophytic silver nanoparticles were synthesised by using pyrrolo metabolites producing actinomycetes as a green catalyst. Different characterization methods such as UV-Visible, XRD, and AFM were used to identify the physiochemical characteristics of synthesised nanoparticles. Results: The synthesised nanoparticles showed λ-max at 427 nm and 402 nm, respectively. The XRD analysis based on the JCPDS database identified the two synthesized nanoparticles as silver oxide nanoparticles (AgO NPs) and silver peroxide nanoparticles (Ag2O3 NPs). The size of these nanoparticles was found to be in the range of 40-44 nm (AgO NPs) and 23-25 nm (Ag2O3 NPs), respectively. The synthesized nanoparticles demonstrated significant anti-fungal activity against dermatophytic fungi Trichophyton mentagrophyes with the zone of inhibition of 38 mm by AgO NP and 17 mm by Ag2O3 NPs. Conclusion: Screening of marine actinomycetes LG003 and LG005 revealed the presence of pyrrolo derivatives as the major metabolites, suggesting that these pyrrolo derivatives could be responsible for synthesis and stabilization of AgO and Ag2O3NPs. Among the synthesized NPs, the AgO NPs showed great potential as an anti-dermatophytic agent. This study provides further research opportunities for AgONPs as anti-fungal agents.

What do we Really Know about Nanotoxicology of Silver Nanoparticles In vivo? New Aspects, Possible Mechanisms, and Perspectives

2020 ◽  
Vol 16 (3) ◽  
pp. 292-320 ◽  
Author(s):  
Nelson Durán ◽  
Wagner J. Fávaro ◽  
Amedea B. Seabra
Keyword(s):  
Silver Nanoparticles ◽  
Lethal Dose ◽  
Synthetic Methods ◽  
Actual State ◽  
Size Distributions ◽  
In Vivo Assays ◽  
Chemical Agents ◽  
Potential Risks ◽  
Biological Sources

Actually, many discussions on the potential risks of silver nanoparticles (AgNPs) have been reported; however, unfortunately, very few considered the great differences between the nature of silver and sources of their syntheses. All data suggested that the effects on toxicity of AgNPs are related to the combination of the specific properties of AgNPs. In this context, this review presents and discusses the recent progress in the nanotoxicity of AgNPs, obtained by different biogenic synthetic protocols, in comparison with chemical synthetic methods, driving to the formation of nanoparticles with diverse structures, and size distributions. Biogenic syntheses of AgNPs using several biological sources and other chemical agents are presented and discussed. Toxicity in different animals is also presented and discussed. By considering the actual state of the art, it can be assumed that oral, intravenous and inhalation doses of AgNPs from 0.1 to 2 mg/Kg in mice and rats are considered a safe administration. In terms of ecotoxicity, it is more concerning since many of the in vivo assays showed a very low lethal dose, i.e., 50% (LD50). Therefore, we have to be very careful with the AgNPs residues in the environment.

scholarly journals Silver nanoparticles (AgNPs) from plant extracts: جسيمات الفضة متناهية الصغر من مستخلصات النبات

2019 ◽  
Vol 3 (2) ◽  
Author(s):  
Samiyah Saeed Al-Zahrani
Keyword(s):  
Silver Nanoparticles ◽  
Plant Extracts ◽  
Pathogenic Bacteria ◽  
Pathogenic Fungi ◽  
Biological Synthesis ◽  
Toxigenic Fungi ◽  
Antimicrobial Efficiency ◽  
Wide Range ◽  
Biological Sources ◽  
And Control

    Synthesis of silver nanoparticles have achieved a distinct focus with an emphasis on their biosynthesis using biological sources such as plants and microorganisms. since plant extracts provide best opportunity for improving green nanotechnology by creating a large array of nanoparticles with antimicrobial efficiency against a wide range of microorganisms such as pathogenic bacteria and plant pathogenic fungi, numerous studies have discussed the deep inroad of antibacterial effect of AgNPs. While there is a lack of studies that advent AgNPs efficiency against toxigenic fungi and control mycotoxins that associated with fungal contamination of food products. This review aimed to summarize the biological synthesis of AgNPs from different natural sources focusing on using this approach as antifungal agent against the most important toxigenic fungi to resolve the mycotoxins evolving issues which influence human and animals’ lives.    

scholarly journals GREEN ROUTE SYNTHESIZED SILVER NANOPARTICLES: AS POTENTIAL ANTIBACTERIAL MATERIAL

2016 ◽  
Vol 3 (1) ◽  
pp. 73-75
Author(s):  
Rajmohan D ◽  
Ranjithkumar R ◽  
Logankumar K ◽  
Sagadevan P ◽  
Chandrashekar B ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Agent ◽  
Leaf Extract ◽  
Zone Of Inhibition ◽  
Gram Negative ◽  
Vinca Rosea ◽  
Green Route ◽  
Escherchia Coli ◽  
Antibacterial Material ◽  
Biological Sources

The green-synthesized method is rapid, superficial, toxic free, suitable, less time consuming, environmental safe and can be applied in a variety of applications in medicinal field. In the present study demonstrated antibacterial action of Vinca rosea Leaf extract medicated Silver Nanoparticles (VrL-AgNPs) tested against both Gram positive and Gram negative pathogens such as Staphylococcus aureus, Escherchia coli and Pseudomonas aeruginosa. The obtained results indicate the VrL-AgNPs achieved maximum zone of inhibition against test pathogens P. aeruginosa and significant action against E.coli and S. aureus. These green routes synthesized silver nanoparticles using biological sources like plant and plant extract which makes them a potent source of antibacterial agent.

Biodiesel Production from Algal Blooms

2012 ◽  
Vol 2 (3) ◽  
pp. 60-71 ◽  
Author(s):  
Shabana Urooj ◽  
Athar Hussain ◽  
Narayani Srivastava
Keyword(s):  
Algal Blooms ◽  
Raw Materials ◽  
Petroleum Products ◽  
Raw Material ◽  
Biodiesel Production ◽  
Waste Materials ◽  
Peak Oil ◽  
Mass Energy ◽  
Biological Sources ◽  
Oil Crisis

Usage of Bio-energy is becoming more and more prominent due to the peak oil crisis. Bio-energy is the energy which can be synthesized using methods and raw material which are available in nature and are derived from the biological sources. They are referred as bio-mass energy, bio-diesel, and bio-power. In this paper the study has been carried out on bio-energy generation in form of bio-diesel and the bio-diesel is produced in the laboratory conditions by using base catalyzed trans-esterification process. The nomenclature bio-diesel is given to the oil which can be generated by using the raw materials which are renewable and are waste materials. It doesn’t contain any percentage of petroleum products in it. It is called bio-diesel because it can be further used to run the diesel engine. In this paper biodiesel is generated using local pond algae by the process of base catalyzed trans-esterification.

scholarly journals PHYTOSYNTHESIS OF SILVERNANO PARTICLES AND ITS APPLICATIONS A CRITICAL STUDY

2021 ◽  
Vol 5 (9) ◽  
Author(s):  
Minakshi Gajanan Pawar ◽  
Ramjan M. Mulani
Keyword(s):  
Silver Nanoparticles ◽  
Plant Extract ◽  
Physiological Condition ◽  
Review Article ◽  
Critical Study ◽  
Physical Factors ◽  
Synthesis Of Nanoparticles ◽  
Stabilizing Agents ◽  
Biological Sources ◽  
Major Factors

Plants are enormous, easily available natural sources of biomolecules for the synthesis of nanoparticles. Until now about 2000 plants are used for the green synthesis of Nanoparticles. The secondary metabolites present in the plant are a source of capping and stabilizing agents more than 100 different biological sources for synthesizing Silver Nanoparticles are reported till date. It is found out by various reports that the reaction condition and the physiological condition of plant extract are the major factors for the synthesis of Silver Nanoparticles. The other physical factors which affect the size, shape, of Silver Nanoparticles include temperature, stirring the reaction mixture, the concentration of plant extract, and ph of the plant extract. In this review article various aspects of Nanobiotechnology, the reaction of Nanoparticles synthesis, applications of Silver Nanoparticles are summarized and it is critically reviewed.

Synthesis, performance and growth mechanism of silver nanoparticle coated SERS fiber probe

2019 ◽  
Vol 107 (3) ◽  
pp. 305
Author(s):  
Mengmei Geng ◽  
Yuting Long ◽  
Tongqing Liu ◽  
Zijuan Du ◽  
Hong Li ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Absorption Spectrum ◽  
Reaction Time ◽  
Growth Mechanism ◽  
Fiber Optic ◽  
Fiber Optic Probe ◽  
Visible Absorption ◽  
Fiber Probe ◽  
Surface Enhanced Raman ◽  
Optic Probe

Surface-enhanced Raman Scattering (SERS) fiber probe provides abundant interaction area between light and materials, permits detection within limited space and is especially useful for remote or in situ detection. A silver decorated SERS fiber optic probe was prepared by hydrothermal method. This method manages to accomplish the growth of silver nanoparticles and its adherence on fiber optic tip within one step, simplifying the synthetic procedure. The effects of reaction time on phase composition, surface plasmon resonance property and morphology were investigated by X-ray diffraction analysis (XRD), ultraviolet-visible absorption spectrum (UV-VIS absorption spectrum) and scanning electron microscope (SEM). The results showed that when reaction time is prolonged from 4–8 hours at 180 °C, crystals size and size distribution of silver nanoparticles increase. Furthermore, the morphology, crystal size and distribution density of silver nanoparticles evolve along with reaction time. A growth mechanism based on two factors, equilibrium between nucleation and growth, and the existence of PVP, is hypothesized. The SERS fiber probe can detect rhodamin 6G (R6G) at the concentration of 10−6 M. This SERS fiber probe exhibits promising potential in organic dye and pesticide residue detection.

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