Microwave assisted synthesis and UV–Vis spectroscopic studies of silver nanoparticles synthesized using vanillin as a reducing agent

Aswathy, B.; Avadhani, G. S.; Sumithra, I. S.; Suji, S.; Sony, G.

doi:10.1016/j.molliq.2011.01.001

Cited by 33 publications

(21 citation statements)

References 31 publications

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“…In particular, the EPS-S-0.625 shows a shoulder at ~560 nm ( Figure 2 b). Together, these SPR band features indicate a heterogeneous distribution of AgNP population [ 31 , 33 ] or a strong interaction between the particles [ 34 ]. While the LCFM-1.250 mM and LCFM-0.625 mM show a color change ( Figure 1 c), they showed little to no absorbance at 425 nm ( Figure 2 a,b) as the spectrophotometric measurements were performed on supernatants, which excluded measurement of unstable AgNPs.…”

Section: Resultsmentioning

confidence: 99%

Individual and Combined Effects of Extracellular Polymeric Substances and Whole Cell Components of Chlamydomonas reinhardtii on Silver Nanoparticle Synthesis and Stability

et al. 2019

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The fresh water microalga Chlamydomonas reinhardtii bioreduced Ag+ to silver nanoparticles (AgNPs) via three biosynthetic routes in a process that could be a more sustainable alternative to conventionally produced AgNPs. The AgNPs were synthesized in either the presence of whole cell cultures, an exopolysaccharide (EPS)-containing cell culture supernatant, or living cells that had been separated from the EPS-containing supernatant and then washed before being suspended again in fresh media. While AgNPs were produced by all three methods, the washed cultures had no supernatant-derived EPS and produced only unstable AgNPs, thus the supernatant-EPS was shown to be necessary to cap and stabilize the biogenic AgNPs. TEM images showed stable AgNPs were mostly spherical and showed a bimodal size distribution about the size ranges of 3.0 ± 1.3 nm and 19.2 ± 5.0 nm for whole cultures and 3.5 ± 0.6 nm and 17.4 ± 2.6 nm for EPS only. Moreover, selected area electron diffraction pattern of these AgNPs confirmed their polycrystalline nature. FTIR of the as-produced AgNPs identified polysaccharides, polyphenols and proteins were responsible for the observed differences in the AgNP stability, size and shape. Additionally, Raman spectroscopy indicated carboxylate and amine groups were bound to the AgNP surface.

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Section: Resultsmentioning

confidence: 99%

Individual and Combined Effects of Extracellular Polymeric Substances and Whole Cell Components of Chlamydomonas reinhardtii on Silver Nanoparticle Synthesis and Stability

et al. 2019

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“…According to Figure 2, each spectrum has a bell shape indicating that the AgNPs were spherical [61]. Additionally, at the higher concentration (1.250 mM), the SPR peak displayed a shoulder at ~490 nm that may be attributed to the strong interaction between the particles [62] or as a result of a heterogeneous AgNP size distribution [63]. In contrast, a more symmetric peak, observed at the lower concentration (0.625 mM), implies less or no significant interaction between the AgNPs.…”

Section: Resultsmentioning

confidence: 99%

Biosynthetic Conversion of Ag+ to highly Stable Ag0 Nanoparticles by Wild Type and Cell Wall Deficient Strains of Chlamydomonas reinhardtii

et al. 2018

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In the current study, two different strains of the green, freshwater microalga Chlamydomonas reinhardtii bioreduced Ag+ to silver nanoparticles (AgNPs), which have applications in biosensors, biomaterials, and therapeutic and diagnostic tools. The bioreduction takes place in cell cultures of C. reinhardtii at ambient temperature and atmospheric pressure, thus eliminating the need for specialized equipment, harmful reducing agents or the generation of toxic byproducts. In addition to the visual changes in the cell culture, the production of AgNPs was confirmed by the characteristic surface plasmon resonance (SPR) band in the range of 415–425 nm using UV-Vis spectrophotometry and further evolution of the SPR peaks were studied by comparing the peak intensity at maximum absorbance over time. X-ray diffraction (XRD) determined that the NPs were Ag0. Micrographs from transmission electron microscopy (TEM) revealed that 97 ± 2% AgNPs were <10 nm in diameter. Ag+ to AgNP conversion was determined by inductively coupled plasma atomic emission spectroscopy (ICP-AES). The AgNPs were stable over time in the cell culture media, acetone, NaCl and reagent alcohol solutions. This was verified by a negligible change in the features of the SPR band after t > 300 days of storage at 4 °C.

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“…In recent years, the green synthesis of nanoparticles has attracted more and more attention, especially using microwave technology, 8 ultrasonic wave technology 9 and photochemical technology. Aswathy et al 13 have synthesized silver nanowires using the polyol process with ethylene glycol as a reducing agent and polyvinylpyrrolidone as a stabilizer, using a microwave technique. 11 Several studies have been focused on green nanoparticle synthesis approaches, including for silver nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of a highly SERS active nanosilver sol using microwaves and its application in the detection of E. coli using Victoria blue B as a molecular probe

et al. 2016

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A rapid and green microwave procedure was developed to synthesize highly surface-enhanced Raman scattering (SERS) active silver nanoparticles (AgNPs), using diethanolamine as a reducing agent, that had a surface plasmon resonance (SPR) absorption peak at 444 nm and a resonance Rayleigh scattering (RRS) peak at 450 nm, and a new SERS enhancement mechanism was proposed for the AgNPs-NaCl-AgNO 3 system. Bacteria, which were stained using Victoria blue B (VBB), possess the characteristics of a SERS molecular probe in the AgNP sol substrate, with a strong SERS peak at 1611 cm À1 and a peak intensity linear to E. coli concentration in the range of 5 Â 10 6 to 3 Â 10 9 colony forming units per mL (cfu mL À1 ). This new, simple, rapid and sensitive SERS quantitative analysis method was used for detecting E. coli in real samples.

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Microwave assisted synthesis and UV–Vis spectroscopic studies of silver nanoparticles synthesized using vanillin as a reducing agent

Cited by 33 publications

References 31 publications

Individual and Combined Effects of Extracellular Polymeric Substances and Whole Cell Components of Chlamydomonas reinhardtii on Silver Nanoparticle Synthesis and Stability

Individual and Combined Effects of Extracellular Polymeric Substances and Whole Cell Components of Chlamydomonas reinhardtii on Silver Nanoparticle Synthesis and Stability

Biosynthetic Conversion of Ag+ to highly Stable Ag0 Nanoparticles by Wild Type and Cell Wall Deficient Strains of Chlamydomonas reinhardtii

Facile synthesis of a highly SERS active nanosilver sol using microwaves and its application in the detection of E. coli using Victoria blue B as a molecular probe

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