MICROWAVE ASSISTED GREEN SYNTHESIS OF SILVER NANOPARTICLES USING COLEUS AMBOINICUS LEAF EXTRACT (original) (raw)
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Biological Sciences SYNTHESIS AND CHARACTERIZATION OF SILVER NANOPARTICLES
2014
Silver nanoparticles exhibit new optical properties, which are observed neither in molecules nor in bulk metals. In the present study silver nanoparticle colloid was produced by chemical reduction method of silver salt (silver nitrate AgNO3) solution. The silver nanoparticles were characterized by using UV-VIS spectrometer and Scanning Electron Microscope (SEM). The Surface Plasmon Resonance peak in absorption spectra of silver colloidal solution showed an absorption maximum at 450 nm which indicated formation of silver nanoparticles. The size range 44nm to 56.55nm of silver nanoparticles was determined by using Scanning Electron Microscope (SEM). The absorbance range of prepared silver nanoparticles solution was checked on 1 st day, 5 th day, 18 th day and on 30 th day. There was no obvious change observed in peak position for 30 days, depicting the stability of Silver nanoparticles.
The Influence of Silver Nanoparticles Synthesis on Their Properties
Acta Polytechnica
Application of green methods to replace physical and chemical methods for synthesis of silver nanoparticles (AgNPs) has become necessary not only from economic aspect but especially due to its significant impact on ecosystem. The properties of biologically synthesized AgNPs using green algae Parachlorella kessleri (P. kessleri) and chemically prepared were investigated and compared. The UVvis analysis confirmed a high stability of biosynthesized AgNPs as well as chemically synthesized gelatin modified citrate-AgNPs. Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) revealed different sizes and shapes of AgNPs synthesized in different ways. Biosynthesized AgNPs have similar inhibitory antimicrobial activity as gelatin/sodium citrate–AgNPs.
Microwave-Assisted Green Synthesis of Silver Nanostructures
Accounts of Chemical Research, 2011
Objective: Current study is aimed at the formulation of silver nanoparticles loaded with the extract of Coleus amboinicus leaf extract by microwave irradiation. A facile and green synthesis of silver nanoparticles by using a biological agent such as plant extracts with the aid of microwave irradiation is proposed as an economical and environmentally friendly approach alternative to chemical and physical methods. Methods: In order to fabricate silver nanoparticles by microwave irradiation, aqueous extract of leaves Coleus amboinicus (CA) were treated with aqueous silver nitrate solution and mixture was placed in the microwave oven for exposure to microwave. Optimizations of the process were carried out by varying the quantity of extract, silver nitrate concentration and duration of microwave irradiation. Formations of nanoparticles were confirmed by UV-visible spectroscopy observing for the presence of surface plasmon resonance (SPR) peak. Nanoparticles were characterized by scanning electron microscopy, transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectroscopy. Results: Silver nanoparticle showed the SPR optical absorption band peak at 434 nm by UV-Visible spectrophotometer. Reaction mixture containing 2 mmol silver nitrate and 9 ml of extract subjected to microwave irradiation of 60 sec at a temperature of 60 °C was found to be optimised condition, which produced nanoparticles that were spherical in shape and had an average diameter of 15.685 nm. Conclusion: This research study opens an innovative design to progress our understanding of how silver nanoparticles behave can be optimized to improve their surface morphology, which is beneficial to improve its therapeutic effect.
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Silver nanoparticles are particles in the size ranging between 1 and 100 nm. The two major methods used for synthesis of silver nanoparticle are the physical and chemical methods with the disadvantage that they are expensive and can also have toxicity. Biological method is being used as an expedient alternative, as this approach is environment-friendly and less toxic and it includes plant extracts, microorganism, fungi, etc. The major applications of silver nanoparticles in the medical field include diagnostic applications and therapeutic applications, apart from its antimicrobial activity. Due to their nanotoxicity, AgNPs have a several drawbacks too. This review presents a complete view of the mechanism of action, synthesis, the pharmacokinetics of silver nanoparticles, different formulations of AgNPs used in biomedical applications, infertility management, antibacterial effects, skin damage, burns, cancer treatment, etc. and various applications of silver nanoparticles together with the possible toxicological challenge.
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Silver nanoparticles range in size from 1 to 100 nm. Used for the assembly of silver nanoparticles the two main methods are physical and chemical methods, they can be expensive and toxic. This approach is environmentally friendly and non-toxic and because it contains plant juices, microorganisms, fungi, etc. The biological method is used as the best alternative. In major applications in the medical field Applications for the detection of silver nanoparticles and therapeutic applications include. Due to their nano toxicity from its antimicrobial activity, Silver nanoparticles also have several drawbacks. Methodology of this review process, synthesis, In pharmacological and biomedical applications of silver nanoparticles Different formulas of silver nanoparticles used, Infertility management, antibacterial effects, skin damage, burns and Provides a holistic overview of cancer treatment.
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Silver nanoparticles have received considerable attention due to their attractive physical and chemical properties. The surface plasmon resonance and large effective scattering cross section of individual silver nanoparticles make them ideal candidates for molecular labeling, where phenomena such as surface enhance Raman scattering (SERS) can be exploited. In addition, silver nanoparticles have recently been shown to be a promising antimicrobial material. In the present research silver colloid was produced by sodium citrate reduction. The colloidal silver was incorporated by dip-coating to the polymer substrate. X-Ray Fluorescence Spectroscopy (XRF), Atomic force microscopy (AFM), ultraviolet-visible spectroscopy (UV-VIS ) and SERS indicate that the produced structures include metallic crystalline silver nanoparticles. The surface plasmon resonance peak in absorption spectra of silver particles showed an absorption maximum at 420-500 nm. The silver - polymer nanocomposites structures with selective light properties as a result of plasmon resonance shifting in the UV-VIS wavelength region were produced.
Zenodo (CERN European Organization for Nuclear Research), 2020
Silver nanoparticles (AgNPs) are gaining attention because of its wide application in medical science as antimicrobial and antibacterial properties. A conventional method for synthesis of AgNPs consumes hazardous chemicals and during production of NPs harmful by-products may also form. Proposed review suggests "greener technology" for synthesis of silver nanoparticles with the help of easily available plants. Aqueous extract of leaf or roots of Impatiens balsamina, Lantana camara, Eriobotrya japonica, Berberis vulgaris, Azadirachta indica, Psidium guajava, Moringa oleifera and Catharanthus roseus and other plant extracts are used as reducing agents to convert Ag + into Ag 0. Light or faint color of plant extract after addition of AgNO 3 turns to brown or deep brown in color, indicates the formation of AgNPs. Fourier Transform Infra Red Spectroscopy (FTIR), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Tunneling Electron Microscopy (TEM) and Dynamic Light Scattering Spectroscopy (DLSS) are techniques employed for characterization and morphological analysis of synthesized silver nanoparticles. Antibacterial, antifungal and antiparacitic applications of synthesized AgNPs have been also discussed. It is concluded that AgNPs synthesized by green way has great potency towards both Gram-negative and Gram-positive bacteria. Moreover, green synthesis of silver nanoparticles is a nonhazardous, eco-friendly, economic and safe technique and will envisaged better option for synthesis of AgNPs.