scholarly journals Bioinspired Metal Nanoparticles for Microbicidal Activity

2021 ◽  
pp. 36-62
Keyword(s):  
Green Synthesis ◽  
Materials Science ◽  
Advanced Oxidation Process ◽  
Low Cost ◽  
Antimicrobial Activities ◽  
Heterogeneous Photocatalysis ◽  
Synthesis Of Nanoparticles ◽  
Medicinal Value ◽  
Low Toxicity ◽  
Synthetic Methodologies

The broad reception for nanotechnology is due to their appreciable size and versatile applications in the interdisciplinary areas. In this modern era one of the major problems is microorganisms possessing antibiotic resistance, nanoparticles (NPs) are a lucrative option to solve this. In materials science, “green synthesis” has gained extensive attention as a reliable, sustainable, and eco-friendly protocol for synthesizing a wide range of materials, especially metals, and metal oxides nanomaterials, hybrid materials and bioinspired materials. As such, green synthesis is regarded as an important tool to reduce the destructive effects associated with the traditional methods for synthesis of nanoparticles commonly utilized in laboratory and industry. Bio-inspired NPs held edges over conventionally synthesized nanoparticles due to their low cost, easy synthesis and low toxicity. This chapter elaborates the developments on the biosynthesis of NPs using natural extracts with particular emphasis on their application as microbiocidal agents. This chapter has very specifically dealt with coinage metals such as Cu, Ag, Au due to their significance of antimicrobial activities. Succeeding, reported the developments in the synthetic methodologies of metal-oxide (Titanium dioxide, TiO2) nanoparticles using novel plant extracts with high medicinal value and their corresponding ability to degrade bacterial pathogens through advanced oxidation process (AOPs) based on heterogeneous photocatalysis.

scholarly journals Green Synthesis of Silver Nanoparticles Using Raw Fruit Extract of Mimusops elengi and their Antimicrobial Study

2020 ◽  
Vol 11 (3) ◽  
pp. 10040-10051
Keyword(s):  
Green Synthesis ◽  
Colloidal Stability ◽  
Low Cost ◽  
Antimicrobial Activities ◽  
Health Food ◽  
Ag Nps ◽  
Fruit Extract ◽  
Silver Nps ◽  
Mimusops Elengi ◽  
Bacteria And Fungi

These days, nanoparticles are being considered as nano-antibiotics because of their execution of antimicrobial activities towards a broad range of microbes. Nanoparticles are used in industrial products, health, food, space, and cosmetics;thus, researchers need for a green, ecofriendly, and low-cost approach to synthesize it. Green synthesis is such an approach of synthesizing NPs using microorganisms and plants, which is free of additional impurities. We used Mimusops elengi Linn. raw fruit extract in water to reduce the silver nitrate salt to produce silver NPs. The samples were characterized using various instrumental techniques. Broadband known as Surface Plasmon Resonance found near 450 nm in the absorption spectrum shows the formation of Ag NPs. NPs with average hydrodynamic diameters in the ranges 20-300 nm were detected from DLS study having negative zeta potential value (varies between - 25.8 to 15.8 mV), which suggests that as NPs surface is charged, it provides colloidal stability to the NPs in a liquid medium. FTIR study reveals that an increase in the intensity of some of the vibrational band with NP-content is due to the adsorption of some molecules on the surface of NPs. XRD pattern shows that NPs have an fcc structure. Samples were tested to have capabilities to kill both bacteria and fungi.

scholarly journals Can Green Synthesis of Nanoparticles be Efficient all Year Long?

2019 ◽  
pp. 32-36
Author(s):  
Mayara Santana dos Santos ◽  
Otávio Augusto Leitão dos Santos ◽  
Sérgio Antunes Filho ◽  
Julia Corrêa dos Santos Santana ◽  
Felipe Motta de Souza ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Green Synthesis ◽  
Waste Prevention ◽  
Atom Economy ◽  
Green Technologies ◽  
Reaction Conditions ◽  
Synthesis Of Nanoparticles ◽  
Nanomaterial Synthesis ◽  
Low Toxicity ◽  
Synthesis Routes

In recent years, the search for inexpensive and eco-friendly synthesis routes has increased significantly. Nanotechnology and biotechnology have established themselves as a major ally in building green technologies for effective, stable, and non-toxic nanomaterial synthesis. [1-3]. Thus, the principles of green bio nanotechnology are associated with waste prevention, maximizing atom economy, and less use of precursors with less hazardous synthesis routes and the use of safe chemicals with low toxicity. Reaction conditions are also advantageous due to safe methodologies and increased energy efficiency.

scholarly journals Adiantum philippense L. Frond Assisted Rapid Green Synthesis of Gold and Silver Nanoparticles

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Duhita G. Sant ◽  
Tejal R. Gujarathi ◽  
Shrikant R. Harne ◽  
Sougata Ghosh ◽  
Rohini Kitture ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Biomedical Applications ◽  
Capping Agent ◽  
Ftir Analysis ◽  
Optimum Conditions ◽  
Gold And Silver Nanoparticles ◽  
Synthesis Of Nanoparticles ◽  
Medicinal Value

Development of an ecofriendly, reliable, and rapid process for synthesis of nanoparticles using biological system is an important bulge in nanotechnology. Antioxidant potential and medicinal value of Adiantum philippense L. fascinated us to utilize it for biosynthesis of gold and silver nanoparticles (AuNPs and AgNPs). The current paper reports utility of aqueous extract of A. philippense L. fronds for the green synthesis of AuNPs and AgNPs. Effect of various parameters on synthesis of nanoparticles was monitored by UV-Vis spectrometry. Optimum conditions for AuNPs synthesis were 1 : 1 proportion of original extract at pH 11 and 5 mM tetrachloroauric acid, whereas optimum conditions for AgNPs synthesis were 1 : 1 proportion of original extract at pH 12 and 9 mM silver nitrate. Characterization of nanoparticles was done by TEM, SAED, XRD, EDS, FTIR, and DLS analyses. The results revealed that AuNPs and AgNPs were anisotropic. Monocrystalline AuNPs and polycrystalline AgNPs measured 10 to 18 nm in size. EDS and XRD analyses confirmed the presence of elemental gold and silver. FTIR analysis revealed a possible binding of extract to AuNPs through –NH2 group and to AgNPs through C=C group. These nanoparticles stabilized by a biological capping agent could further be utilized for biomedical applications.

Green synthesis of nanoparticles: current prospectus

2015 ◽  
Vol 4 (4) ◽  
Author(s):  
Tejaswi Thunugunta ◽  
Anand C. Reddy ◽  
Lakshmana Reddy D.C.
Keyword(s):  
Green Synthesis ◽  
Material Science ◽  
Low Cost ◽  
Nanoparticle Synthesis ◽  
Biological Synthesis ◽  
Synthesis Of Nanoparticles ◽  
The Past ◽  
Environmental Friendly ◽  
Physical Chemical ◽  
Biological Methods

AbstractIn the past few years, nanoparticles have been applied in various fields of science and technology, ranging from material science to biotechnology. Thus, the synthesis of nanoparticles can be considered as a dynamic area in research and application of nanoparticles. The different methods of nanoparticle synthesis include physical, chemical, and biological methods. Of these methods, the biological synthesis is to be comparatively widely used due to its advantages of being low cost, nontoxic and environmental friendly. Bio-applications of nanoparticles have pawed way for green synthesis of nanoparticles. In this review, we have provided brief information on various biological agents used for the synthesis of nanoparticles.

scholarly journals NEEM (AZADIRACHTA INDICA A. JUSS) AS A SOURCE FOR GREEN SYNTHESIS OF NANOPARTICLES

2018 ◽  
Vol 11 (3) ◽  
pp. 15 ◽  
Author(s):  
Girish K
Keyword(s):  
Green Synthesis ◽  
Plant Extracts ◽  
Azadirachta Indica ◽  
Low Cost ◽  
Synthesis Method ◽  
Neem Extract ◽  
Synthesis Of Nanoparticles ◽  
Potential Applications ◽  
Vast Area ◽  
Biomedical Fields

 Nanoscience has found various applications in different biomedical fields. The synthesis of nanoparticles (NPs) has become a vast area of research due to its potential applications. These particles can be prepared by different chemical, physical, and biological approaches. In recent years, green synthesis of NPs using plant extracts has gained much interest due to non-toxicity and very low cost of synthesis. The plant extracts act both as reducing agent as well as capping agent. Neem (Azadirachta indica A. Juss) is a well-known medicinal plant and has been studied for the biosynthesis of NPs. A. indica has various phytochemicals identified that can reduce the metal ions. The bioreduction of NPs from neem extract is an eco-friendly, low cost, and green synthesis method and these NPs are reported to exhibit good antimicrobial, mainly antibacterial, activity

scholarly journals SÍNTESE E CARACTERIZAÇÃO DE NANOPARTÍCULAS DE OURO COLOIDAL COM O LÁTEX COMO UM AGENTE REDUTOR

Nativa ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 268
Author(s):  
Pedro Henrique da Conceição Silva ◽  
Anselmo Fortunato Ruiz Rodriguez
Keyword(s):  
Gold Nanoparticles ◽  
Green Synthesis ◽  
Low Cost ◽  
Colloidal Suspension ◽  
Reducing Agent ◽  
Synthesis Of Nanoparticles ◽  
Chemical Reagents ◽  
The North ◽  
Toxic Agents ◽  
Croton Lechleri

Tradicionalmente as técnicas de síntese de nanopartículas utilizam solventes tóxicos, o que gera resíduos potencialmente nocivos tanto à saúde quanto ao meio ambiente. Buscando metodologias mais sustentáveis na síntese de nanopartículas várias pesquisas têm proposto a utilização de agentes biológicos ou parte deles, em substituição aos reagentes químicos tóxicos. Assim, este trabalho propôs sintetizar nanopartículas de ouro, utilizando síntese verde, ou seja, o látex da planta Sangue de Dragão (Croton lechleri Müll. Arg.) como agente redutor. A planta Sangue de Dragão é nativa dos países Peru e Bolívia, no Brasil ela é encontrada na região Norte, nos estados Rondônia, Acre e Amazonas. Para realizar a síntese de nanopartículas, em busca de condições de síntese e de aperfeiçoamento de parâmetros, utilizou-se a técnica de visão de nanopartículas em suspensão coloidal e estabilidade, com monodispersividade. Obtendo-se monodispersidade das nanopartículas de ouro, sendo formadas nanopartículas que se encontram no diâmetro entre 10 nm e 40 nm. O potencial zeta esteve na faixa de da região de +/- 30 mV, também foi observado que as partículas se agregam com uma dispersão instável, no decorrer do tempo. A síntese verde utilizando o látex da planta Sangue de Dragão apresentou-se resultados compatíveis com as técnicas que utilizam os agentes tóxicos, porem sustentável e com baixo custo para a realização.Palavras-chave: Croton lechleri, nanopartículas de ouro, ressonância plasmônica superficial. SYNTHESIS AND CHARACTERIZATION OF COLOIDAL GOLD NANOPARTICLES WITH LATEX AS A REDUCING AGENT ABSTRACT: Traditionally the techniques of synthesis of nanoparticles use toxic solvents, which generate residues potentially harmful to health and the environment. Looking for more sustainable methodologies in the synthesis of nanoparticles several researches has proposed the use of biological agents or part of them, replacing the toxic chemical reagents. Thus, this work proposed to synthesize gold nanoparticles, using green synthesis, that is, the latex of the Dragon Blood plant (Croton lechleri Müll. Arg.) As a reducing agent. The Dragon Blood plant is native to Peru and Bolivia, in Brazil it is found in the North region, in the states of Rondônia, Acre and Amazonas. To perform the synthesis of nanoparticles, searching for conditions of synthesis and improvement of parameters, the technique of nanoparticle vision in colloidal suspension and stability, with monodispersivity, was used. Obtaining monodispersity of the gold nanoparticles, being formed nanoparticles that are in the diameter between 10 nm and 40 nm. The zeta potential was within the range of +/- 30 mV, it was also observed that the particles aggregate with an unstable dispersion over time. The green synthesis using the latex of the Dragon Blood plant presented results compatible with the techniques that use the toxic agents, but sustainable and with low cost to the realization.Keywords: Croton lechleri, gold nanoparticles, superficial plasmon resonance.

scholarly journals Green Synthesis and Characterization of Iron Oxide Nanoparticles Using Phyllanthus Niruri Extract

2018 ◽  
Vol 34 (5) ◽  
pp. 2583-2589 ◽  
Author(s):  
Viju Kumar V. G. ◽  
Ananthu A. Prem
Keyword(s):  
Antimicrobial Activity ◽  
Iron Oxide ◽  
Green Synthesis ◽  
Iron Oxide Nanoparticles ◽  
Low Cost ◽  
Iron Oxide Nanoparticle ◽  
Oxide Nanoparticles ◽  
Phyllanthus Niruri ◽  
Synthesis Of Nanoparticles

Studies on green synthesis of nanoparticles moves forward a lot on these days. The present work involves the green method of synthesizing iron oxide nanoparticle from Phyllanthus niruri leaf extract. Furthermore, the green synthesized iron oxide nanoparticles were characterized and its antimicrobial activity was investigated. A characteristic comparison with chemical method of synthesis is also done, for iron nanoparticles. The characterization of nanoparticle includes the IR, UV-Vis, surface morphology and size determination using TEM, SEM, and XRD. The analytical studies revealed that the synthesized iron oxide nanoparticles from these two different methods have almost identical size and morphology. The synthesized iron oxide nanoparticles showed significant antimicrobial activity against the microbes, E. coli and P. aeroginosa. The studies concluded that the synthesis of iron oxide nanoparticles using plant extracts is more beneficial as it is an economical, energy efficient, low cost and environment-friendly process than the bio hazardous chemical synthesis. The present investigation may be a definite contribution to green chemistry in general and nano synthesis in particular.

scholarly journals A Review on Green Synthesis, Biomedical Applications, and Toxicity Studies of ZnO NPs

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
V. N. Kalpana ◽  
V. Devi Rajeswari
Keyword(s):  
Green Synthesis ◽  
Biomedical Applications ◽  
Antimicrobial Activities ◽  
Industrial Applications ◽  
High Rate ◽  
Multiple Drug ◽  
Synthesis Methods ◽  
Zno Nps ◽  
Synthesis Of Nanoparticles ◽  
Secondary Sources

The advance of reliable and eco-friendly strategies for the development of nanoparticles is a fundamental key to the discipline of nanotechnology. Nanoparticles have been continuously evaluated and have been used in many industrial applications for a decade. In particular, the role of zinc oxide nanoparticles (ZnO NPs) has received a great interest because of various properties such as UV filter properties and photochemical, antifungal, high catalyst, and antimicrobial activities. Because of the high rate of poisonous chemicals and the extreme surroundings used within the chemical and physical methods, the green techniques have been adopted using plants, fungi, bacteria, and algae for the synthesis of nanoparticles. Therefore, this paper considers various green synthesis methods to provide the evidence of ZnO NP role to several applications, and in addition, biomedical applications and toxic effect were reviewed. Therefore, the paper used various secondary sources to collect the relevant review articles. From the findings, the green route of synthesis is rather safe and eco-friendly when compared to physical and chemical means of synthesis. On the other hand, its biomedical applications in this sector are increased day by day in various processes including bioimaging, drug delivery, biosensors, and gene delivery. With respect to its toxicity properties, ZnO NPs can act as smart weapons against multiple drug-resistant microorganisms and as a talented substitute for antibiotics.

scholarly journals Immobilized TiO2 on glass spheres applied to heterogeneous photocatalysis: photoactivity, leaching and regeneration process

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4464 ◽  
Author(s):  
Deivisson Lopes Cunha ◽  
Alexei Kuznetsov ◽  
Carlos Alberto Achete ◽  
Antonio Eduardo da Hora Machado ◽  
Marcia Marques
Keyword(s):  
Active Sites ◽  
Advanced Oxidation Process ◽  
Low Cost ◽  
Solar Spectrum ◽  
Heterogeneous Photocatalysis ◽  
X Ray Diffraction ◽  
Glass Spheres ◽  
Simple Protocol ◽  
Attractive Option ◽  
Supporting Material

Heterogeneous photocatalysis using titanium dioxide as catalyst is an attractive advanced oxidation process due to its high chemical stability, good performance and low cost. When immobilized in a supporting material, additional benefits are achieved in the treatment. The purpose of this study was to develop a simple protocol for impregnation of TiO2-P25 on borosilicate glass spheres and evaluate its efficiency in the photocatalytic degradation using an oxidizable substrate (methylene blue), in a Compound Parabolic Concentrator (CPC) reactor. The assays were conducted at lab-scale using radiation, which simulated the solar spectrum. TiO2 leaching from the glass and the catalyst regeneration were both demonstrated. A very low leaching ratio (0.03%) was observed after 24 h of treatment, suggesting that deposition of TiO2 resulted in good adhesion and stability of the photocatalyst on the surface of borosilicate. This deposition was successfully achieved after calcination of the photocatalyst at 400 °C (TiO2-400 °C). The TiO2 film was immobilized on glass spheres and the powder was characterized by scanning electron microscopy (SEM), X-ray diffraction and BET. This characterization suggested that thermal treatment did not introduce substantial changes in the measured microstructural characteristics of the photocatalyst. The immobilized photocatalyst degraded more than 96% of the MB in up to 90 min of reaction. The photocatalytic activity decreased after four photocatalytic cycles, but it was recovered by the removal of contaminants adsorbed on the active sites after washing in water under UV-Vis irradiation. Based on these results, the TiO2-400 °C coated on glass spheres is potentially a very attractive option for removal of persistent contaminants present in the environment.

scholarly journals Sustainable robust green synthesis of nanoparticles from waste aquatic plants and its application in environmental remediation

2021 ◽  
Author(s):  
Uma Maheswari Balasubramanian ◽  
Sivakumar Vaiyazhipalayam Murugaiyan ◽  
Thirumarimurugan Marimuthu
Keyword(s):  
Green Synthesis ◽  
Aquatic Plants ◽  
Environmental Remediation ◽  
Low Cost ◽  
Batch Adsorption ◽  
Synthesis Of Nanoparticles ◽  
Recovery Potential ◽  
Heavy Metal Remediation ◽  
Bet Analysis ◽  
Pseudo Second Order

Abstract Green synthesis of nanoparticles using natural materials is an emerging technique that fascinates the scientific community globally for the treatment of wastewater. In the present study, aquatic plants such as Piaropus crassipes (PC) and Lemna gibba (LG), were utilized to make low-cost nanoparticles, and its feasibility for the removal of Zn(II) ions was studied. The synthesized nano adsorbents were characterized by Scanning Electron Microscopy (SEM), Fourier Transform Infra-Red Spectroscopy (FTIR), Brunauer Emmett-Teller (BET) analysis, and Zeta potential analysis. The optimal conditions were evaluated by batch adsorption studies, to investigate the parameters suchas pH (2–7), adsorbent dosage (0.5–5 g/L), initial concentration (20–60 mg/L), and contact time (10–120 min) etc, respectively. The isotherm, and kinetic data results fit well with Langmuir, and pseudo-second order model. The anticipated monolayer adsorption capacity with respect to the PC, and LG was found to be 42.41 mg/g and 27.65 mg/g, respectively. Thermodynamic studies showed that the process is exothermic. The adsorption mechanism of PC/LG on Zn(II) exhibited surface complexation, ion exchange, and diffusion. Desorption studies were performed to analyze the recovery potential of Zn(II) ion. Hence, this article investigates the economic synthesis of green nanoparticles, and their potential utilization in heavy metal remediation.

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