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 Effectiveness of Green Synthesized Silver Nanoparticles (Ag-Nps) of Delonix Regia Pods in Water Disinfection

2019 ◽  
Vol 9 (1) ◽  
pp. 2543-2547
Keyword(s):  
Silver Nanoparticles ◽  
Contact Time ◽  
Research Work ◽  
Extended Period ◽  
Water Disinfection ◽  
Ag Nps ◽  
Delonix Regia ◽  
Silver Nps ◽  
Bacteria And Fungi ◽  
Green Synthesized Silver Nanoparticles

Particles of sizes between 1 and 100 nanometers are known as nanoparticles. The natural materials like plant leaf extract, bacteria and fungi for the synthesis of silver nanoparticles has numerous benefits. In this scenario, the main objective of this work is to utilize Delonix Regia pod extract for the synthesis of silver nanoparticles (NPs) and check its feasibility as disinfectant. Pod extract prepared was subjected to EDS analysis. Transformed silver NPs are coated onto GAC(1.5mm) and subjected to SEM analyses. Column study was carried to check the disinfecting action of silver NPs for varied contact time by monitoring MPN value. From this research work, it can be concluded as, for pod extract, peak absorbance was found at 360nm. Delonix Regia pod extract transforms into silver nanoparticles moderately to about 4.63-8.85%. Silver nanoparticles are coated onto Activated Carbon, dried and stored for extended period without loss of nanoparticles. At 30min contact time efficiency was found to be 63% and 71 for NP2.5 and NP5 respectively. Green synthesized silver nanoparticles are proved to be moderately effective in disinfecting contaminated water.

scholarly journals Green Synthesis, Characterization and Antimicrobial activity of Silver Nanoparticles from the Extract of Lagerstroemia speciosa

2021 ◽  
Vol 37 (3) ◽  
pp. 648-655
Author(s):  
Vinit Prakash ◽  
Harpreet Kaur ◽  
Anjana Kumari ◽  
Manoj Kumar ◽  
Sumeet Gupta ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Kidney Diseases ◽  
Ethanolic Extract ◽  
Antimicrobial Activities ◽  
Diffusion Method ◽  
Bacterial Strains ◽  
Ag Nps

Lagerstroemia speciosais commonly known as Banaba or Jarul which is used to get rid of various ailments such as fever, urinary infection, decongestion, diarrhoea, mouth ulcers, astringent, diabetes mellitus, kidney diseases, abdominal pains etc. The present work, describes the green synthesis of silver nanoparticles from ethanolic extract of fruits of L.speciosa (Ls-Ag NPs) and their analysis for antimicrobial activities. The characterisation of so obtained nanoparticles have been carried out with help of Field emission scanning electron microscopy (FESEM) and High-resolution transmission electron microscopy (HRTEM). Further, antimicrobial activities of ethanolic extract of fruits of L.speciosa(Ee-Ls), silver oxide (Ag2O), and Ls-Ag NPs have been examined by using well-diffusion method against two bacterial strains: Staphylococcus aureus (gram-positive) and Escherichia coli (gram-negative) and one fungal strain: Aspergillus niger.It has been observed that the biosynthesized Ls-Ag NPs possess much effective antimicrobial activity against selected strains as compared to Ee-Ls and Ag2O.

scholarly journals Silver nanoparticles: Green Synthesis and Their Antibacterial efficiency

2021 ◽  
Vol 59 (2) ◽  
pp. 214
Author(s):  
Dung Ngo Thanh ◽  
Nguyet Ha Minh ◽  
Tam Le Thi Thanh ◽  
Lu Le Trong
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Green Synthesis ◽  
Silver Nitrate ◽  
Tannic Acid ◽  
Ag Nanoparticles ◽  
Sodium Citrate ◽  
Reducing Agents ◽  
Ag Nps ◽  
Silver Nps

In this study, silver nanoparticles were synthesized from aqueous silver nitrate through a simple and eco-friendly route using a combination of two reducing agents: sodium citrate and tannic acid. By this method, the obtained Ag nanoparticles (NPs) were stable within the studied period of six months. Besides, both TEM images and UV-Vis results showed that the size of silver NPs could be controlled by changing the concentration of tannic acid. The antibacterial ability of Ag NPs with different sizes were also examined. In detail, the smaller the Ag NPs were, the more efficient their antibacterial activity was.

scholarly journals Green synthesis of silver nanoparticles (Ag-NPs) from Olea dioica Roxb., leaf extracts and its biological activity

Biomedicine ◽  
2020 ◽  
Vol 39 (4) ◽  
pp. 544-549
Author(s):  
G. K. Pratap ◽  
Manjula Shantaram
Keyword(s):  
Silver Nanoparticles ◽  
Medicinal Plants ◽  
Green Synthesis ◽  
Leaf Extract ◽  
Synthesis Method ◽  
Antimicrobial Activities ◽  
Sem Analysis ◽  
Nano Particles ◽  
Ag Nps ◽  
Leaf Extracts

Introduction and Aim: The silver nanoparticles have attained a special place in the area of nanotechnology because of their different biological applications. Fabrication of nanoparticles using green synthesis is  done because of its wide applications in different fields such as biomedical, medicine, agriculture and food engineering. This study is to develop an easy and eco-friendly method for the synthesis of Ag-NPs using leaf extracts of the medicinal plant. Materials and Methods: The medicinal plants are rich sources of various medicinal properties. Olea dioica Roxb., leaf extract was used to investigate the effects of Ag-NPs having antibacterial activity and antioxidant capacity.  The plant leaf extract contains flavonoids, alkaloids, saponins, and phenolic compounds which acts as reducing and stabilizing agents. The green synthesized silver nanoparticles were characterized by various techniques like UV- visible spectrophotometer, FTIR spectroscopy, and SEM analysis. Results: The synthesis of sliver nanoparticles from plant source, and analysis of nano particles by UV-Vis spectra, SEM and FTIR. The biological evaluations of Ag-NPs indicated an excellent inhibitory efficacy, antioxidant and antimicrobial activity for their future applications in medicine. Conclusion: The synthesized silver nanoparticles exhibited potent antioxidant and antimicrobial activities against Gram-positive and Gram-negative bacteria. The silver (Ag-NPs) nanoparticles synthesized by the pot green synthesis method proves its potential use in various medical applications. Keywords: Silver nanoparticles; Medicinal plants; Ag-NPs; Olea dioica Roxb.,

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 monometallic and copper-silver bimetallic nanoparticles using Kigelia africana fruit extract and evaluation of their antimicrobial activities

2018 ◽  
Vol 13 (3) ◽  
pp. 24-32 ◽  
Author(s):  
B. Ashishie Providence ◽  
A. Anyama Chinyere ◽  
A. Ayi Ayi ◽  
O. Oseghale Charles ◽  
T. Adesuji Elijah ◽  
...  
Keyword(s):  
Green Synthesis ◽  
Bimetallic Nanoparticles ◽  
Antimicrobial Activities ◽  
Fruit Extract

Biosynthesis and Characterization of Silver Nanoparticles using Ziziphus mauritiana Leaf Extract

2021 ◽  
Vol 17 (4) ◽  
pp. 691-699
Author(s):  
Neeshat Fathima ◽  
Shaistha Afreen ◽  
Thirumavalavan Muniyan ◽  
Venkatesa Prabhu Sundramurthy ◽  
Nahom Daniel
Keyword(s):  
Green Synthesis ◽  
Leaf Extract ◽  
Primary Amines ◽  
Ziziphus Mauritiana ◽  
Average Particle ◽  
Ag Nps ◽  
Synthesis Of Nanoparticles ◽  
Vis Spectroscopy ◽  
Silver Nps ◽  
Xrd Techniques

In the area of Nano technological research, green synthesis of Nanoparticles (NPs) has pulled in a ton of interest in light of the fact that the green-synthesized Ag NPs show more prominent antimicrobial and inhibitory qualities, in perspective on which they could be utilized in various applications in the areas of medical and drug delivery. It might be the most appropriate option for the conventional techniques that are commonly conflicting and exert dangerous impacts on the earth. In this research, green synthesis of silver NPs using Ziziphus mauritiana leaf extract was carried out. The synthesized Ag NPs were characterized using UV–V is spectrophotometry, scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD) techniques. The consequences of UV-Vis spectroscopy showed plasma resonance peaks around 413 nm, that exhibited the existence of Ag NPs. The result observedfromSEM demonstrated thatNPs werefound inspherical and in the 4–96 nm range. The practical gatherings forNPs synthesis using organic compounds with minimized procedure of biosynthesis and stabilization of silver NPs were studied with FTIR and were observed to be phenols, alcohols, primary amines, and alkenes. The XRD pattern demonstrated the FCC structure of AgNO3 and average particle was observed to be 12.0 nm.

scholarly journals Green Synthesis of Metal Nanostructures and Its Nonlinear Optical Properties

2021 ◽  
Author(s):  
Emusani Ramya
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Nonlinear Optical ◽  
Electric Dipole Transition ◽  
Metal Nanostructures ◽  
Ag Nps ◽  
Nonlinear Optical Susceptibility ◽  
Visible Absorption ◽  
Luminescence Enhancement ◽  
Silver Nps

Simple green synthesis of metal nanoparticles (Ag NPs) was prepared by using Raphanussativus leaf extract. This extract acts as reduce and stabilizing agent. The formation of silver NPs was confirmed and characterized by XRD, UV–visible absorption spectrum, TEM, and FTIR. The luminescence enhancement and quenching of Eu3+and Sm3+ ions were observed in the presence of silver NPs. The luminescence enhancement is owing to arise in the electric-dipole transition with alteration of the field around Ln3+ ions. Nonlinear studies in femtosecond (fs) and picosecond (ps) time scales have been studied by using the Z-scan technique. Third-order nonlinear optical susceptibility of silver nanoparticles was obtained with Degenerate Four-Wave Mixing (DFWM) in the fs regime. The lifetimes of lanthanum complexes were increased by the concentration of silver NPs and decreased for further silver. The high enhanced luminescence and nonlinear studies of green synthesized silver nanoparticles can be used in optics and bio applications.

scholarly journals Single-Step Green Synthesis of Highly Concentrated and Stable Colloidal Dispersion of Core-Shell Silver Nanoparticles and Their Antimicrobial and Ultra-High Catalytic Properties

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1007
Author(s):  
Azam Ali ◽  
Mariyam Sattar ◽  
Fiaz Hussain ◽  
Muhammad Humble Khalid Tareen ◽  
Jiri Militky ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Tannic Acid ◽  
Rate Constant ◽  
Catalytic Properties ◽  
Colloidal Dispersion ◽  
Alkaline Condition ◽  
Core Shell ◽  
Average Particle ◽  
Ag Nps

The versatile one-pot green synthesis of a highly concentrated and stable colloidal dispersion of silver nanoparticles (Ag NPs) was carried out using the self-assembled tannic acid without using any other hazardous chemicals. Tannic acid (Plant-based polyphenol) was used as a reducing and stabilizing agent for silver nitrate in a mild alkaline condition. The synthesized Ag NPs were characterized for their concentration, capping, size distribution, and shape. The experimental results confirmed the successful synthesis of nearly spherical and highly concentrated (2281 ppm) Ag NPs, capped with poly-tannic acid (Ag NPs-PTA). The average particle size of Ag NPs-PTA was found to be 9.90 ± 1.60 nm. The colloidal dispersion of synthesized nanoparticles was observed to be stable for more than 15 months in the ambient environment (25 °C, 65% relative humidity). The synthesized AgNPs-PTA showed an effective antimicrobial activity against Staphylococcus Aureus (ZOI 3.0 mM) and Escherichia coli (ZOI 3.5 mM). Ag NPs-PTA also exhibited enhanced catalytic properties. It reduces 4-nitrophenol into 4-aminophenol in the presence of NaBH4 with a normalized rate constant (Knor = K/m) of 615.04 mL·s−1·mg−1. For comparison, bare Ag NPs show catalytic activity with a normalized rate constant of 139.78 mL·s−1·mg−1. Furthermore, AgNPs-PTA were stable for more than 15 months under ambient conditions. The ultra-high catalytic and good antimicrobial properties can be attributed to the fine size and good aqueous stability of Ag NPs-PTA. The unique core-shell structure and ease of synthesis render the synthesized nanoparticles superior to others, with potential for large-scale applications, especially in the field of catalysis and medical.

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