scholarly journals Degradation of Methylene Blue Using Biologically Synthesized Silver Nanoparticles

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
M. Vanaja ◽  
K. Paulkumar ◽  
M. Baburaja ◽  
S. Rajeshkumar ◽  
G. Gnanajobitha ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Nitrate Solution ◽  
Reaction Medium ◽  
Silver Ions ◽  
Silver Nitrate Solution ◽  
X Ray ◽  
Synthesis Of Nanoparticles ◽  
Aqueous Leaf Extract

Nowadays plant mediated synthesis of nanoparticles has great interest and achievement due to its eco-benign and low time consuming properties. In this study silver nanoparticles were successfully synthesized by usingMorinda tinctorialeaf extract under different pH. The aqueous leaf extract was added to silver nitrate solution; the color of the reaction medium was changed from pale yellow to brown and that indicates reduction of silver ions to silver nanoparticles. Thus synthesized silver nanoparticles were characterized by UV-Vis spectrophotometer. Dispersity and morphology was characterized by scanning electron microscope (SEM); crystalline nature and purity of synthesized silver nanoparticles were revealed by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX). FTIR spectrum was examined to identify the effective functional molecules responsible for the reduction and stabilization of silver nanoparticles synthesized by leaf extract. The photocatalytic activity of the synthesized silver nanoparticles was examined by degradation of methylene blue under sunlight irradiation. Green synthesized silver nanoparticles were effectively degrading the dye nearly 95% at 72 h of exposure time.

Pretreated Lignocellulosic Waste Mediated Biosynthesis of Silver Nanoparticles Under Room Temperature

2016 ◽  
Vol 15 (05n06) ◽  
pp. 1660001 ◽  
Author(s):  
V. P. Manjamadha ◽  
Karuppan Muthukumar
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nitrate ◽  
Room Temperature ◽  
Nitrate Solution ◽  
Silver Ions ◽  
Silver Nitrate Solution ◽  
Morphological Characterization ◽  
Alternative Source ◽  
X Ray ◽  
Antibacterial Performance

The current work elucidates the utilization of biowaste as a valuable reducing agent for the synthesis of silver nanoparticles. In this study, the wastewater generated during the alkaline pretreatment of lignocellulosic wastes (APLW) was used as a bioreductant to reduce silver nitrate under room temperature. Synthesis of stable silver nanoparticles (AgNPs) was achieved rapidly on addition of APLW into the silver nitrate solution (1[Formula: see text]mM). The morphological characterization of AgNPs was performed using field emission scanning electron microscopy (FESEM). The micrograph clearly depicted the presence of spherical AgNPs. The presence of elemental silver along with biomoilties was determined using energy dispersive X-ray spectroscopy (EDAX) analysis. The X-ray diffraction (XRD) study proved the crystalline form of stable AgNPs. The AgNPs exhibited excellent antibacterial performance against Gram negative organism. The immediate bioreduction of silver ions using APLW was well illustrated in the present study. Thus, APLW serve as an alternative source for reducing agents instead of utilizing valuable medicinal plants for nanoparticles synthesis.

Synthesis and Characterization of Silver Nanoparticles from Couroupita guianensis leaf extract–A Simple Green Route

2021 ◽  
pp. 2796-2800
Author(s):  
Inbathamizh L ◽  
Kalpana V ◽  
Revathi Yadav K
Keyword(s):  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Nitrate Solution ◽  
Ultra Violet ◽  
Silver Nitrate Solution ◽  
Green Route ◽  
Couroupita Guianensis ◽  
Potential Applications ◽  
Aqueous Leaf Extract

With the increase in the potential applications of nanoparticles in pharma and various fields, nanoparticle research is attracting more attention. Though several chemical and physical methods are being used for the synthesis of metal nanoparticles, they are associated with several disadvantages. Couroupita guianensis is a traditional plant with medicinal values. The focus of the study was to follow a green chemistry route to synthesize silver nanoparticles (AgNPs) using the leaf extract of Couroupita guianensis as a reductant and stabilizing agent. The boiled aqueous leaf extract with silver nitrate solution on exposure to sunlight showed the maximum absorbance at 430nm indicating the synthesis of AgNPs. Ultra Violet (UV)-Visible spectroscopy, Scanning Electron Microscopy (SEM), and Fourier Transform Infrared spectroscopy (FTIR) techniques were used for the characterization of AgNPs. The synthesized AgNPs were found to be spherical and 4.44 – 40.20nm in size. They also seemed to be capped with the significant functional groups present in the leaf extract. Thus, the study suggested Couroupita guianensis mediated green synthesis of AgNPs as an efficient and eco-friendly approach with substantial advantages over the conventional methods. The process could be further scaled-up for mass production and wider applications of AgNPs.

Analysing the phytochemistry and anti-oxidant property of fabricated silver nanoparticles using Catharanthus roseus leaf extract

2021 ◽  
Vol 16 (12) ◽  
pp. 72-79
Author(s):  
A.K. Keshari ◽  
S. Saxena ◽  
G. Pal ◽  
V. Srivashtav ◽  
R. Srivastav
Keyword(s):  
Silver Nanoparticles ◽  
Electron Microscope ◽  
Catharanthus Roseus ◽  
Leaf Extract ◽  
Spherical Shape ◽  
Silver Ions ◽  
Antioxidant Property ◽  
X Ray ◽  
Morphological Studies ◽  
Aqueous Leaf Extract

A green rapid biogenic synthesis of silver nanoparticles (AgNPs) using Catharanthus roseus leaf extract was performed. Synthesized nanoparticles were characterized using UV-Visible, Fourier transform infra-red (FTIR) and X-ray diffraction (XRD). The reduction of silver ions to AgNPs using C. roseus extract was completed within 240 mins. The formation of AgNPs was confirmed by Surface Plasmon Resonance (SPR) at 442 nm using UV-Vis Spectrophotometer and it is characterized by XRD, Transmission electron microscope (TEM) and Scanning electron microscope (SEM). The morphological studies revealed the spherical shape of the particles with sizes ranging from 16-35 nm and Energy dispersive X-ray (EDX) spectrum confirmed the presence of silver along with other elements in the plants metabolite. The extracellular AgNPs synthesis by aqueous leaf extract demonstrates ultra-fast, simple and inexpensive method comparable to other methods. The antioxidant assay of the synthesized AgNPs indicated that they have a strong antioxidant property as compared to the control. Since these compounds are also safe to use and discharged into the environment, the green AgNPs could be considered as an innovative alternative approach for biomedical and nanoscience based industries.

Green Synthesis of Silver Nanoparticles by Allamanda cathartica L. Leaf Extract and Evaluation for Antimicrobial Activity

2013 ◽  
Vol 6 (4) ◽  
pp. 2260-2268
Author(s):  
M. Linga Rao ◽  
Bhumi G ◽  
Savithramma N
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Fusarium Species ◽  
Inhibition Zone ◽  
Fungal Species ◽  
Green Technology ◽  
Metallic Silver ◽  
Synthesis Of Nanoparticles ◽  
Aqueous Leaf Extract

Silver nanoparticles (SNPs) exhibit tremendous applications in medicine as antimicrobial agent.  The use of different parts of plants for the synthesis of nanoparticles is considered as a green technology as it does not involve any harmful chemicals.  In the present study, we report a rapid biosynthesis of silver nanoparticles from aqueous leaf extract of medicinal plant Allamanda cathartica.  The active phytochemicals present in the plant were responsible for the quick reduction of silver ion to metallic silver nanoparticles. The reduced silver nanoparticles were characterized by using UV-Vis spectrophotometry, Scanning Electron Microscope (SEM), Energy Dispersive Analysis of X-ray (EDAX) and Atomic Force Microscopy (AFM).  The spherical shaped silver nanoparticles were observed and it was found to 19-40 nm range of size.  These phytosynthesized SNPs were tested for their antimicrobial activity and it analyzed by measuring the inhibitory zone. A. cathartica aqueous leaf extract of SNPs showed highest toxicity to Pseudomonas followed by Klebsiella, Bacillus and E. coli and lowest toxicity towards Proteus. In fungal species, highest inhibition zone was noted against Rhizopus followed by Curvularia, Aspergillus flavus and Aspergillus niger and minimum inhibition zone was observed against Fusarium species.  These results suggest a promising potential of Indian plant-based green chemistry for production of SNPs for biomedical and nanotechnology applications.

Controlling the Surface Plasmon Absorption of Silver Nanoparticles via Green Synthesis Using Pennisetum purpureum Leaf Extract

2018 ◽  
Vol 772 ◽  
pp. 73-77
Author(s):  
Ruelson S. Solidum ◽  
Arnold C. Alguno ◽  
Rey Capangpangan
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Silver Nitrate ◽  
Surface Plasmon ◽  
Leaf Extract ◽  
Nitrate Solution ◽  
Silver Nitrate Solution ◽  
Absorption Peak ◽  
Plasmon Absorption ◽  
Surface Plasmon Absorption

We report on the green synthesis of silver nanoparticles utilizing theP.purpureumleaf extract. Controlling the surface plasmon absorption of silver nanoparticles was achieved by regulating the amount of extract concentration and the molarity of silver nitrate solution. The surface plasmon absorption peak is found at around 430nm. The surface plasmon absorption peak have shifted to lower wavelength as the amount of extract is increased, while plasmon absorption peak shifts on a higher wavelength as the concentration of silver nitrate is increased before it stabilized at 430nm. This can be explained in terms of the available nucleation sites promoted by the plant extract as well as the available silver ions present in silver nitrate solution.

scholarly journals Green Synthesis, Characterization and In-vitro Antioxidant Property of Silver Nanoparticles Using the Aqueous Leaf Extract of Justicia carnea

2021 ◽  
pp. 20-30
Author(s):  
I. O. Salaudeen ◽  
M. O. Olajuwon ◽  
A. B. Ajala ◽  
T. O. Abdulkareem ◽  
S. A. Adeniyi ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Antioxidant Activities ◽  
Silver Ions ◽  
Antioxidant Property ◽  
Biological Macromolecules ◽  
Aqueous Leaf Extract ◽  
In Vitro Antioxidant Activity

This study investigated the synthesis, characterization and in vitro antioxidant activity of silver nanoparticles (AgNPs) using the aqueous leaf extract of Justicia carnea.  The aqueous leaf extract of J. carnea was used as a potential reducing and capping agent. To identify the compounds responsible for the reduction of silver ions, the functional groups present in the plant extract were subjected to FTIR. The in vitro antioxidant activity of synthesized nanoparticles was evaluated in terms of ferric reducing antioxidant potential (FRAP), DPPH (1,1-diphenyl-2-picrylhydrazyl) and ABTS (2,2`-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid) free radicals scavenging assays. The surface plasmon resonance confirmed the formation of AgNPs with maximum absorbance at kmax = 446 nm. FTIR revealed the biological macromolecules of J. carnea leaf extract involved in the synthesis and stabilization of AgNPs. UV-Visible spectrophotometer showed absorbance peak in the range of 436-446 nm. The silver nanoparticles exhibited moderate antioxidant activities compared to standard antioxidants (ascorbic acid and BHT). These results confirmed this protocol as simple, eco-friendly, nontoxic and an alternative for conventional physical and chemical methods. It can be concluded that J. carnea leaf extract can be used effectively in the production of potential antioxidant AgNPs which could be useful in various bio-applications such as cosmetics, food and biomedical industry.

The study the formation of silver nanoparticles by bacteria of the genus Bacillus

2021 ◽  
Vol 09 (04) ◽  
pp. 14-19
Author(s):  
Sevda Adilkom qızı Həsənova ◽  
◽  
Gülşən Çərkəz qızı Süleymanova ◽  
Sevinc Məhi qızı Quliyeva ◽  
Mehnurə Misir qız Rəhimova ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Culture Medium ◽  
Extracellular Enzymes ◽  
Nitrate Solution ◽  
Chemical Properties ◽  
Reaction Medium ◽  
Culture Fluid ◽  
Staining Reaction ◽  
Bacillus Sp ◽  
Synthesis Of Nanoparticles

Nanotechnology studies materials with a size of 1-100 nm. Various microorganisms (bacteria, fungi. actinomycetes and others) are involved in the synthesis of nanoparticles in a biological way. Nanoscale materials are important as new antimicrobials due to their unusual physical and chemical properties - the activity of intracellular and extracellular enzymes plays a key role in the synthesis of nanoparticles by microorganisms. Was studied the ability of Bacillus sp strains to formation of silver nanoparticles. During the study, silver nitrate solution was added to biomass and culture medium of Bacillus sp.l, sp.2, sp.3. It was found that the culture medium of the Bacillus sp. l strain capableof producing silver nanoparticles, but the biomass does not have the property of forming silver nanoparticles. Its ability to form silver nanoparticles was detected by staining reaction medium in a dark color. However, the ivestigation the ability to formation silver nanoparticles by strains Bacillus sp2 and Bacillus sp3 showed that they cannot biosynthesis the silver nanoparticles. Was investigated the morpho-cultural features of the bacterial strain Bacillus sp.l. Was shown that Bacillus sp.l strain belonged to Bacillus cereus specie. Key words: bacteria, silver nanoparticles, Bacillus sp, culture fluid, biomass

Green Synthesis of Nanostructured Silver Metal Particals and Catalytic Degradation of Toxic Methylene Blue Dye

2020 ◽  
Author(s):  
Jyoti Kedar ◽  
Ajinkya Kasar ◽  
Neha Pardeshi ◽  
Pradhumna Tiwari ◽  
Suyash Bhosale
Keyword(s):  
Methylene Blue ◽  
Silver Nanoparticles ◽  
Silver Nitrate ◽  
Silver Nanoparticle ◽  
Nitrate Solution ◽  
Silver Nitrate Solution ◽  
Noble Metal Nanoparticles ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Uv Visible

Abstract The growth and development of bio-synthesized noble metal nanoparticles have attracted great amount of interest in field of nanotechnology due to their potential use for human benefits. The fungal synthesis of noble metal nanoparticles like silver nanoparticle is a sustainable, eco- friendly and green chemistry approach that amalgamate Mycology, Biotechnology and nanotechnology. Accordingly silver nanoparticles (silver nanoparticles) can be synthesized by physical, chemical and biological methods respectively. The aim of this research is to carry green synthesis of silver nanoparticles (silver nanoparticle) i.e. biological method using aqueous fungal extract of penicillium rubens. The aqueous fungal extract was added to silver nitrate solution where the color of the silver nitrate reaction medium was changed from Pale yellow to brown which indicates reduction of silver ions to silver nanoparticles. Thus synthesized silver nanoparticles were characterized by UV-Visible spectroscopy, which shows characterized peak between 400-420 nm. In order to classify the effective functional molecules responsible for the reduction and stabilization of fungal synthesized silver nanoparticles, the FTIR spectrum was examined. Optimization of production of silver nanoparticles was done by changing parameters such as pH, temperature and concentration of silver nitrate solution and determined by absorbance in UV-Visible spectrophotometer. Thus, it is concluded that the biosynthesis of silver nanoparticles using extracellular fungal filtrate was simple, eco-friendly and robust. Also the dye reduction capabilities of silver nanoparticles were examined. Effective degradation of Methylene blue dye was observed giving 97 % efficiency in 90 minutes of exposure time.

scholarly journals Synthesis, characterization and antibacterial potential of silver nanoparticles by Morus nigra leaf extract

2013 ◽  
Vol 1 (04) ◽  
pp. 16-24 ◽  
Author(s):  
Anu Kumar ◽  
Kuldeep Kaur ◽  
Sarika Sharma
Keyword(s):  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Bacterial Species ◽  
Nitrate Solution ◽  
Average Particle Size ◽  
Silver Nitrate Solution ◽  
Sem Analysis ◽  
Average Particle ◽  
Morus Nigra ◽  
Uv Visible

The present study reports the synthesis of silver nanoparticle using Morus nigra leaf extract were used as reducing agent for reduction of silver nitrate solution. The synthesis of silver nanoparticles was analyzed by UV-Visible spectroscopy, Scanning Electron Microscopy. The SEM analysis has shown that size of silver nanoparticles synthesized from leaves extract of M.nigra was 200 nm and seems to be spherical in morphology. Morphology of chemically synthesized silver nanoparticles is nearly spherical and of size ranges from 300-500 nm. The average particle size analyzed from SEM analysis was observed to be 350 nm. This article has discussed the synthesis of silver nanoparticles generated from plant extract, characterization and antibacterial analysis. In this study the antibacterial activity was examined against six MTCC cultures collected from IMTECH Chandigarh, Including both gram positive and gram negative bacteria such as P.aeruginosa, S.aureus, B.subtilis, E.coli, P.flourescens and Streptococus mutans. Out of these strains the antimicrobial activity of the silver nanoparticles showed maximum zone of inbhition against P.flourescens (22 mm), P.aeruginosa (19 mm), S.aureus (18 mm) and least effective against E.coli (15mm). In contrast chemically synthesized silver nanoparticles were found most effective against S.aureus (13 mm) and B.subtilis (12mm) and almost ineffective against Streptococcus mutans (6 mm) and P.flourescens (4 mm). In the concluding remarks, the silver nanoparticles synthesized using M.nigra leaves extract would be a better antimicrobial effective against various bacterial species.

scholarly journals Sintesis Nanopartikel Perak Menggunakan Ekstrak Daun Salam (Syzygium polyanthum) Sebagai Bioreduktor Dan Uji Aktivitasnya Sebagai Antioksidan

2019 ◽  
Vol 7 (1) ◽  
pp. 51-60
Author(s):  
Paulina Taba ◽  
Nadya Yuli Parmitha ◽  
Syahruddin Kasim
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Average Particle Size ◽  
Average Diameter ◽  
Average Particle ◽  
X Ray ◽  
Synthesis Of Nanoparticles ◽  
Particle Size Analyzer ◽  
Ic50 Value

Silver nanoparticles have been synthesized by the reduction method using salam leaf extract (Syzygium polyanthum) as a reducing agent. The silver nanoparticles produced were then tested for their activity as antioxidants. The formation of silver nanoparticles was carried out by adding the leaf extract into the solution of AgNO3 and homogenized using a magnetic stirrer. A UV-Vis spectrophotometer was used to confirm the formation of silver nanoparticles. Particle Size Analyzer (PSA), Scanning Electron Microscope (SEM), X-Ray Diffractometer (XRD) and Fourir Transform Infra Red (FTIR) spectrometers were used to characterize the nanoparticles produced before being tested for antioxidant activity. The results showed that the absorbance value increased with increasing reaction contact time. The maximum uptake was obtained at wavelengths of 432-446 nm using a UV-Vis spectrophotometer. The particle size was determined using a PSA with an average particle size distribution of 45.7 nm. The average diameter of silver nanoparticles was 10.06 – 13.97 nm and the silver nanoparticles had rod-shapes. Functional groups that play a role in the synthesis of nanoparticles were –OH, –C=O, and –C-O groups. Silver nanoparticles inhibited free radicals as antioxidants with the IC50 value of 582.7 ppm.

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