Synthesis and characterization of silver nanoparticles in AOT microemulsion system

Zhang, Wanzhong; Qiao, Xueliang; Chen, Jianguo

doi:10.1016/j.chemphys.2006.09.029

Cited by 134 publications

(67 citation statements)

References 32 publications

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“…3. The increases in the intensity of the plasmon bands indicate the decrease in the band width (Zhang et al 2006). The UV-Vis spectrum shows the important role of AgNO 3 and the presence of ingredients in the leaves for the formation of silver nanoparticles.…”

Section: Antibacterial Activitymentioning

confidence: 99%

Characterization of silver nanoparticles by green synthesis method using Pedalium murex leaf extract and their antibacterial activity

2015

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In this paper, an aqueous extract of fresh leaves of Pedalium murex was used for the synthesis of silver (Ag) nanoparticles. Different biological methods are gaining recognition for the production of silver nanoparticles (AgNPs) due to their multiple applications. The use of plants in the green synthesis of nanoparticles emerges as a cost-effective and eco-friendly approach. Characterization of nanoparticles was done using different methods, which include; ultraviolet-visible spectroscopy (UV-Vis), Fourier transform infrared (FTIR), powder X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), energy dispersive X-ray analysis (EDAX), fluorescence emission spectroscopy, transmission electron microscope (TEM), dynamic light scattering (DLS), zeta potential and antibacterial activity. UV-visible spectrum of the aqueous medium containing silver nanoparticles showed absorption peak at around 430 nm. Fourier transform infrared spectra had shown that the biomolecule compounds were responsible for the reduction and capping material of silver nanoparticles. XRD study showed the particles to be crystalline in nature, with a face-centered cubic (fcc) structure. The size and stability were detected using DLS and zeta potential analysis. The antibacterial activity of AgNPs against generally found bacteria was assessed to find their potential use in silver-containing antibacterial product.

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Section: Antibacterial Activitymentioning

confidence: 99%

Characterization of silver nanoparticles by green synthesis method using Pedalium murex leaf extract and their antibacterial activity

2015

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“…The solution was heated to 40 °C and stirred for 0.5 h. Honey yellow coloured silver nanoparticle and wine red coloured copper nanoparticle which are spherical and highly monodispersed were obtained respectively. The nanoparticles in the suspensions are stored in N 2 for future use and they are characterized using HRTEM, SEM and EDX measurements [34][35][36][37][38][39][40][41][42][43][44][45].…”

Section: Synthesis Of Silver Nanoparticle and Copper Nanoparticlementioning

confidence: 99%

Fluorescence Quenching of b-Casein by Silver Nanoparticles and Copper Nanoparticles in Presence of Sugars: A Quantitative Exploration

Vasumathi¹,

Santhanalakshmi²

2018

Asian J. Chem.

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INTRODUCTIONInvention of non-invasive in vivo biosensors is today's necessity in diagnostics, medical analysis and therapy [1,2]. Detection and estimation of sugars in biological systems attract the attention of medical engineers. When protein-carbohydrate interactions are studied and established in presence of silver and copper nanoparticles, new immunotherapeutic strategies may be discovered in the treatment of malignant diseases [3]. In this paper the studies on the interaction of silver nanoparticles (AgNP) and copper nanoparticles (CuNP) with milk protein, β-casein (BCA) is quantitatively described using fluorescence quenching measurements. The interaction studies between the protein and the nanoparticles (Pro-NP) are extensively studied in presence of various monosaccharide and disaccharide sugars like glucose, fructose, galactose, sucrose, maltose and lactose. The protein β-casein (BCA) exhibits a strong fluorescence emission, which is sensitive to active quenchers. Metal nanoparticles like copper nanoparticles and silver nanoparticles with enhanced and unique properties are reported to quench protein fluorescence appreciably. In the present work, the fluorescence quenching effects of metal nanoparticles on the protein fluorescence are extensively studied in presence of various sugar molecules. This may play a significant role in the sensing applications of sugar molecular systems in the presence of metal nanoparticles. β-Casein is used as fluorophore and sugar molecular systems like sucrose, maltose, fructose, lactose, galactose and glucose are chosen as quenchers and the protein-sugar interactions are arrived from fluorescence quenching results in the presence of copper nanoparticles and silver nanoparticles. To find the role of life time on the intensity of fluorescence, time resolved fluorescence measurements for the protein-sugar systems in the presence and absence of nanoparticles is measured. The proteinnanoparticles-sugar fluorescence interactions are analyzed by using Stern-Volmer plots and thermodynamic plots using fluorescence intensity quenching data. The trends in the extent of quenching action on protein fluorescence and also the binding interactions among protein sugar systems are quantified in the presence of copper nanoparticles and silver nanoparticles separately, in terms of Stern-Volmer constant values and binding constants values. β-Casein is found to interact strongly with the quenchers in the presence of copper nanoparticle and silver nanoparticle. Silver nanoparticle is read to be a better quenching mediator than copper nanoparticle for the fluorescence intensity in molecular interactions. Order of sugars quenching the protein fluorescence in presence of the nanoparticles is found.

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“…The broadening of absorption spectra at lower contact time duration was due to the formation of large sized nanoparticles. As the incubation time accelerates further, intense peaks were observed indicating the synthesis of small sized nanoparticles 31 . This was confirmed by HRTEM microphotographs, where the sizes of nanoparticles range between 50 to 20nm at 1, 2, 4, 6 and 24 hrs (Fig.…”

Section: Resultsmentioning

confidence: 99%

Untitled

2017

IJPSR

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ABSTRACT:The present study instantiates the phyto-fabrication of silver nanoparticles by utilizing Petrea volubilis L. leaf broth which were instantaneously synthesised, eco-friendly, and cost-effective. The influence of physico-chemical parameters viz. contact time, leaf broth quantity, pH, temperature, and silver nitrate concentration were investigated and optimised to engineer infinitesimal nanoparticles. The SPR bands obtained from UVvis spectroscopy confirmed the synthesis of silver nanoparticles. The active phytochemicals in Petrea volubilis L. leaf broth namely carboxylic acids, phenolic compounds and aldehydes were found to be responsible for the bio reduction and capping of silver ions according to FT-IR spectroscopy. The capping molecules of NPs were negatively charged and were passably stable as revealed by zeta potential measurements and the XRD patterns illustrated their crystallinity. HRTEM microphotographs enumerate spherical shaped nanoparticles. The EDS analysis at 2θ confirms the synthesis of elemental silver. The nanoparticles were evaluated for their antimicrobial activity. The highest anti-bacterial activity was observed against S. aureus as compared to the bacteria S. typhi and A. flavus a fungus. The leaf extract did not show any anti-microbial activity. Our findings disclose the synthesis of various sizes of silver nanoparticles by varying the physico-chemical parameters. These diminutive nanoparticles are promising antimicrobial agents and evince a great potential in medical applications.

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Synthesis and characterization of silver nanoparticles in AOT microemulsion system

Cited by 134 publications

References 32 publications

Characterization of silver nanoparticles by green synthesis method using Pedalium murex leaf extract and their antibacterial activity

Characterization of silver nanoparticles by green synthesis method using Pedalium murex leaf extract and their antibacterial activity

Fluorescence Quenching of b-Casein by Silver Nanoparticles and Copper Nanoparticles in Presence of Sugars: A Quantitative Exploration

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