scholarly journals Biosynthesis of silver nanoparticles using Caesalpinia ferrea (Tul.) Martius extract: physicochemical characterization, antifungal activity and cytotoxicity

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4361 ◽  
Author(s):  
Mônica R. P. S. Soares ◽  
Rafael O. Corrêa ◽  
Pedro Henrique F. Stroppa ◽  
Flávia C. Marques ◽  
Gustavo F. S. Andrade ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Metallic Nanoparticles ◽  
Physicochemical Characterization ◽  
Candida Guilliermondii ◽  
X Ray Diffraction ◽  
Minimum Fungicidal Concentration ◽  
Vis Spectroscopy ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Background Green synthesis is an ecological technique for the production of well characterized metallic nanoparticles using plants. This study investigated the synthesis of silver nanoparticles (AgNPs) using a Caesalpinia ferrea seed extract as a reducing agent. Methods The formation of AgNPs was identified by instrumental analysis, including ultraviolet–visible (UV–Vis) spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) of the AgNPs, and surface-enhanced Raman scattering (SERS) spectra of rhodamine-6G (R6G). We studied the physicochemical characterization of AgNPs, evaluated them as an antifungal agent against Candida albicans, Candida kruzei, Candida glabrata and Candida guilliermondii, and estimated their minimum inhibitory concentration (MIC) and minimum fungicidal concentration (MFC) values. Lastly, this study evaluated the cytotoxicity of the AgNPs in murine L929 fibroblasts cells using an MTT assay. Results The UV–Vis spectroscopy, SERS, SEM and XRD results confirmed the rapid formation of spheroidal 30–50 nm AgNPs. The MIC and MFC values indicated the antifungal potential of AgNPs against most of the fungi studied and high cell viability in murine L929 fibroblasts. In addition, this study demonstrated that C. ferrea seed extracts may be used for the green synthesis of AgNPs at room temperature for the treatment of candidiasis.

scholarly journals Green synthesis of Ag/TiO2 Nanocomposite Assisted by Gambier Leaf (Uncaria gambir Roxb) Extract

2019 ◽  
Vol 22 (6) ◽  
pp. 250-255 ◽  
Author(s):  
Sry Wahyuni ◽  
Syukri Syukri ◽  
Syukri Arief
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Diffuse Reflectance Spectroscopy ◽  
Irradiation Time ◽  
Rutile Phase ◽  
X Ray Diffraction ◽  
Silver Surface ◽  
X Ray ◽  
Synthesis Of Nanoparticles ◽  
Vis Spectroscopy

Studies of green synthesis of nanoparticles mediated by plants extract is extensively explored and studied in recent time due to eco-friendliness, cost-effectiveness, and use a minimum amount of toxic chemicals in the process of inorganic material synthesis. In this study, the immobilization of silver nanoparticles on the surface of titanium dioxide (TiO2) was carried out using Uncaria gambier Roxb. leaf extract as a silver ion (Ag+) reducing agent. The synthesized Ag/TiO2 nanocomposite was characterized by UV-Vis spectroscopy, X-ray diffraction (XRD), and Diffuse Reflectance Spectroscopy (DRS). The formation of silver nanoparticles was confirmed through UV-Vis spectroscopic analysis, which showed a silver surface plasmon resonance (SPR) band at 426 nm. The X-ray diffraction pattern shows that Ag can inhibit the transition of the anatase into rutile phase. The presence of Ag particles in TiO2 can increase the absorption ability from an initial wavelength of 407 nm to 438 nm. Based on the results of Rhodamin B degradation, it can be seen that Ag/TiO2 has a higher photocatalytic activity than bare TiO2 with 99% percent degradation at 120 minutes of irradiation time.

A NOVEL SYNTHESIS METHOD FOR SILVER NANOPARTICLES USING MOLTEN ε-CAPROLACTAM AS SOLVENT AND REDUCING AGENT

NANO ◽  
2014 ◽  
Vol 09 (08) ◽  
pp. 1450085
Author(s):  
PENG LI ◽  
HOUSHENG XIA ◽  
GUISHENG YANG
Keyword(s):  
Silver Nanoparticles ◽  
Synthesis Method ◽  
Reducing Agent ◽  
Synthesis Process ◽  
Precipitation Reaction ◽  
X Ray Diffraction ◽  
Ag Nps ◽  
Transmission Electron ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

A precipitation–reduction synthesis method for silver nanoparticles ( Ag NPs) was developed. Molten ε-caprolactam (CL) was used not only as solvent but also as reducing agent and stabilizer. At first, Ag 2 O NPs was prepared by precipitation reaction of silver nitrate ( AgNO 3) and sodium hydroxide ( NaOH ) using molten CL as solvent at 100°C. Then, Ag 2 O NPs was in situ reduced into Ag NPs by molten CL at 120°C. Techniques of X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to monitor the synthesis process. With the increase of reduction time, monodispersed Ag 2 O NPs (ca. 3.7 nm) were integrated and larger Ag NPs (10–90 nm) were formed. Fourier transform infrared (FT-IR) results showed that the surface of Ag NPs was capped with about 0.9 wt.% of CL molecules. Surface enhanced Raman scattering (SERS) effect of Ag NPs was investigated using Rhodamine 6G as a probe molecule.

Green Synthesis of Silver Nanoparticles Using Ginkgo biloba and Their Bactericidal and Larvicidal Effects

2018 ◽  
Vol 10 (3) ◽  
pp. 422-428 ◽  
Author(s):  
Pannerselvam Balashanmugam ◽  
Hyung Joo Kim ◽  
Vijay Singh ◽  
Rangarajulu Senthil Kumaran
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Ginkgo Biloba ◽  
Metallic Nanoparticles ◽  
Antibacterial Activities ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Visible ◽  
Plant Leaf Extract ◽  
Larvicidal Activities

The synthesis of metallic nanoparticles using plant extracts has attracted much attention. In this study, silver nanoparticles (AgNPs) were synthesized using the Ginkgo biloba plant-leaf extract and their antibacterial and larvicidal activities were investigated. AgNPs were characterized using UV-visible, X-ray diffraction (XRD), Fourier transform infrared (FTIR), energy-dispersive X-ray (EDX) spectroscopy and field emission scanning electron microscope (FESEM) analysis. The UV-visible spectral analysis showed a surface plasmon resonance (SPR) peak at 430 nm, the FESEM analysis revealed size of AgNPs between 25–45 nm and the XRD data confirmed the formation of the AgNPs using G. biloba-mediated green synthesis. AgNPs showed the highest antibacterial activities against Pseudomonas aeruginosa, Staphylococcus aureus, Bacillus subtills, Enterobacter aerogens, Salmonella paratyphi and Escherichia coli. Also, the AgNPs exerted a significant larvicidal effect on the Culex mosquito larvae.

scholarly journals Detection of Silver Nanoparticles in Seawater Using Surface-Enhanced Raman Scattering

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1711
Author(s):  
Monica Quarato ◽  
Ivone Pinheiro ◽  
Ana Vieira ◽  
Begoña Espiña ◽  
Laura Rodriguez-Lorenzo
Keyword(s):  
Silver Nanoparticles ◽  
Raman Scattering ◽  
Detection Method ◽  
Surface Enhanced Raman Scattering ◽  
Consumer Products ◽  
Method Performance ◽  
Vis Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Nanomaterials significantly contribute to the development of new solutions to improve consumer products properties. Silver nanoparticles (AgNPs) are one of the most used, and as human exposure to such NPs increases, there is a growing need for analytical methods to identify and quantify nanoparticles present in the environment. Here we designed a detection strategy for AgNPs in seawater using surface-enhanced Raman Scattering (SERS). Three commercial AgNPs coated with polyvinylpyrrolidone (PVP) were used to determine the relative impact of size (PVP-15nmAgNPs and PVP-100nmAgNPs) and aggregation degree (predefined Ag aggregates, PVP-50–80nmAgNPs) on the SERS-based detection method. The study of colloidal stability and dissolution of selected AgNPs into seawater was carried out by dynamic light scattering and UV-vis spectroscopy. We showed that PVP-15nmAgNPs and PVP-100nmAgNPs remained colloidally stable, while PVP-50–80nmAgNPs formed bigger aggregates. We demonstrated that the SERS-based method developed here have the capacity to detect and quantify single and aggregates of AgNPs in seawater. The size had almost no effect on the detection limit (2.15 ± 1.22 mg/L for PVP-15nmAgNPs vs. 1.51 ± 0.71 mg/L for PVP-100nmAgNPs), while aggregation caused an increase of 2.9-fold (6.08 ± 1.21 mg/L). Our results demonstrate the importance of understanding NPs transformation in seawater since this can influence the detection method performance.

scholarly journals Green Synthesis of Silver Nanoparticles Using Apple Extract and Its Antibacterial Properties

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Zainal Abidin Ali ◽  
Rosiyah Yahya ◽  
Shamala Devi Sekaran ◽  
R. Puteh
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Color Change ◽  
Antibacterial Properties ◽  
Reducing Agent ◽  
X Ray Diffraction ◽  
Gram Positive Bacteria ◽  
Clean Synthesis ◽  
Vis Spectroscopy ◽  
Ag Crystallites

Silver nanoparticles (AgNPs) were synthesized using apple extract as a reducing agent and aqueous silver nitrate as the precursor. The AgNPs formation was observed as a color change of the mixture from colorless to dark-brownish. The X-ray diffraction pattern confirmed the presence of only Ag crystallites, and the dynamic light scattering estimates the average sizes of the AgNPs to be 30.25 ± 5.26 nm. Furthermore, Fourier Transform Infrared as well as UV-vis spectroscopy identifies ethylene groups as the reducing agent and capping agent for the formation of the AgNPs. This green synthesis provides an economic, eco-friendly, and clean synthesis route to AgNPs. AgNPs in suspension showed activity against Gram-negative and Gram-positive bacteria with minimum bactericidal concentrations (MBCs) to be in the range from 125 μg/mL to 1000 μg/mL.

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