Fungal based synthesis of silver nanoparticles—An effect of temperature on the size of particles

Fayaz, A. Mohammed; Balaji, K; Kalaichelvan, P. T.; Venkatesan, R.

doi:10.1016/j.colsurfb.2009.07.002

Cited by 253 publications

(50 citation statements)

References 33 publications

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“…The peak at 3273 cm −1 corresponding to N–H stretching of the secondary amide of the protein and the peak at 2925 cm −1 corresponding to C–H stretching of methylene groups of the protein (Bozanic et al 2010). Peak at 1629 cm −1 corresponding to –CO stretch of amide I band of proteins (Fayaz et al 2009). The sharp peak at 1320 cm −1 can be assigned to C–N stretching vibrations of aromatic amines (Rashmi and Varma 2009).…”

Section: Resultsmentioning

confidence: 99%

“…These proteins and biomolecules will often associate with nanoparticles that must be preventing the agglomeration and stabilize nanoparticles. Various fungi have been reported to synthesize AgNPs, including Alternaria alternate (Monali et al 2009), Amylomyces rouxii (Javed et al 2010), Aspergillus niger (Netala et al 2015b), Coriolus versicolor (Rashmi and Varma 2009), Fusarium solani (Rafie et al 2012), Humicola sp (Asad et al 2013), Neurospora crossa (Longoria et al 2011), Schizophyllum radiatum (Metuku et al 2014), and Trichoderma viride (Fayaz et al 2009) have been reported.…”

Section: Introductionmentioning

confidence: 99%

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Endophytic fungal isolate mediated biosynthesis of silver nanoparticles and their free radical scavenging activity and anti microbial studies

et al. 2016

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The present study reports that the biosynthesis of AgNPs using an endophytic fungus isolated from the ethnomedicinal plant Centella asiatica. The endophytic fungus was identified as Aspergillus versicolor ENT7 based on 18S rRNA gene sequencing (NCBI Accession number KF493864). The AgNPs synthesized were characterized by UV–visible spectroscopy, Fourier transform infra-red spectroscopy (FTIR), transmission electron microscopy (TEM), X-ray diffraction (XRD), particle size analyzer, and zeta potential measurements. The UV–Vis absorption spectra showed the peak at 429 nm which confirmed the synthesis of AgNPs. TEM analysis revealed that the AgNPs were spherical in shape with 3–40 nm in size; similar results were also obtained by Horiba particle size analyzer with 5–40 nm in size. The synthesized AgNPs were highly stable due to their high negative zeta potential value of −38.2 mV. XRD studies showed (111), (200), (220), (311), and (222) planes of the face-centered cubic (FCC) lattice, indicating the crystalline nature of the AgNPs. Selected area electron diffraction (SAED) pattern of the AgNPs showed five circular fringes which were in accordance with XRD data and confirmed the formation of high crystalline nature of AgNPs. FTIR measurements indicated the peaks at 3273, 2925, 1629, 1320, and 1020 cm−1 corresponding to different functional groups possibly involved in the synthesis and stabilization of AgNPs. The synthesized AgNPs exhibited effective free radical scavenging activity with the IC50 value of 60.64 µg/ml. The synthesized AgNPs were found to be highly toxic against both gram-positive and gram-negative bacteria and also showed a very good antifungal activity.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Endophytic fungal isolate mediated biosynthesis of silver nanoparticles and their free radical scavenging activity and anti microbial studies

et al. 2016

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“…It was already shown that by varying the pH value and / or temperature, the resulting shapes and / or sizes of metal NPs synthesized by fungi vary [6,27-29]; however, the fungal strains used are potential plant or human pathogens. In this work, we use the extract of the non-pathogenic fungus N. crassa and we show that an alkaline pH value at a temperature of 60°C favors the formation of small (3 to 12 nm), quasi-spherical gold NPs while acid pH value resulted in the formation of different-shaped NPs in a broad size range of about 10 to 200 nm.…”

Section: Resultsmentioning

confidence: 99%

SERS Properties of Different Sized and Shaped Gold Nanoparticles Biosynthesized under Different Environmental Conditions by Neurospora crassa Extract

et al. 2013

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Surface-enhanced Raman scattering (SERS) is a surface-sensitive technique that enhances Raman scattering by molecules adsorbed on rough metal surfaces. It is known that metal nanoparticles, especially gold and silver nanoparticles, exhibit great SERS properties, which make them very attractive for the development of biosensors and biocatalysts. On the other hand, the development of ecofriendly methods for the synthesis of metallic nanostructures has become the focus of research in several countries, and many microorganisms and plants have already been used to biosynthesize metallic nanostructures. However, the majority of these are pathogenic to plants or humans. Here, we report gold nanoparticles with good SERS properties, biosynthesized by Neurospora crassa extract under different environmental conditions, increasing Raman signals up to 40 times using methylene blue as a target molecule. Incubation of tetrachloroauric acid solution with the fungal extract at 60°C and a pH value of a) 3, b) 5.5, and c) 10 resulted in the formation of gold nanoparticles of a) different shapes like triangles, hexagons, pentagons etc. in a broad size range of about 10-200 nm, b) mostly quasi-spheres with some different shapes in a main size range of 6-23 nm, and c) only quasi-spheres of 3-12 nm. Analyses included TEM, HRTEM, and EDS in order to corroborate the shape and the elemental character of the gold nanoparticles, respectively. The results presented here show that these ‘green’ synthesized gold nanoparticles might have potential applicability in the field of biological sensing.

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“…It is noteworthy to mention that with the increase in reaction temperature, UV-Vis spectra show sharp narrow peaks at lower wavelength regions (∼412 nm at 55 and 70 °C), which indicate the formation of smaller nanoparticles, whereas, at lower reaction temperature, the peaks observed at higher wavelength region (425 nm at 25 °C) which clearly indicates increase in silver nanoparticles size. It is a well-known fact that when the temperature is increased, the reactants are consumed rapidly leading to the formation of smaller nanoparticles [61,62].…”

Section: Uv-visible Absorption Studiesmentioning

confidence: 99%

Green Biosynthesis of Spherical Silver Nanoparticles by Using Date Palm (Phoenix Dactylifera) Fruit Extract and Study of Their Antibacterial and Catalytic Activities

Farhadi

Ajerloo

Mohammadi

2017

ACSi

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In this work, we have synthesized spherical silver nanoparticles (Ag NPs) by a low-cost, rapid, simple and ecofriendly approach using Date palm fruit extract as a novel natural reducing and stabilizing agent. The product was characterized by UV-visible spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), energy-dispersive X-ray (EDX) spectroscopy and Zeta potential measurements. The reaction conditions including time, content of reducing agent and silver nitrate, temperature and pH were investigated. The optimum yield of Ag NPs was obtained when 10 mM of silver nitrate was reacted with Date fruit extract at pH 11 and heated it to 55 °C within 10 minutes. The elemental and crystalline nature of Ag NPs were confirmed from EDX and XRD analysis. SEM and TEM images showed that the Ag NPs were spherical and with sizes in the range of 25-60 nm. On the base of FT-IR analysis, it can be stated that the functional groups present in bio-molecules of Date fruits are responsible for the reduction and stabilization of Ag NPs, respectively. The Ag NPs showed good antibacterial activity against a few human pathogenic bacteria. The catalytic activity of the Ag NPs for rapid and efficient reduction of toxic nitro compounds into less toxic corresponding amines by using NaBH 4 was also investigated.

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Fungal based synthesis of silver nanoparticles—An effect of temperature on the size of particles

Cited by 253 publications

References 33 publications

Endophytic fungal isolate mediated biosynthesis of silver nanoparticles and their free radical scavenging activity and anti microbial studies

Endophytic fungal isolate mediated biosynthesis of silver nanoparticles and their free radical scavenging activity and anti microbial studies

SERS Properties of Different Sized and Shaped Gold Nanoparticles Biosynthesized under Different Environmental Conditions by Neurospora crassa Extract

Green Biosynthesis of Spherical Silver Nanoparticles by Using Date Palm (Phoenix Dactylifera) Fruit Extract and Study of Their Antibacterial and Catalytic Activities

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