Concentration-dependent surface-enhanced Raman scattering of 2-benzoylpyridine adsorbed on colloidal silver particles

Chowdhury, Joydeep; Ghosh, Manas

doi:10.1016/j.jcis.2004.04.030

Cited by 66 publications

(44 citation statements)

References 35 publications

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“…Figure 8 gives the selective enhancement of Raman bands of the organic capping agents bound to the nanoparticles. The spectrum shows a strong and sharp band at 240 cm −1 , which can be attributed to the stretching vibrations of Ag–N [30,31] and Ag–O bonds [32]. This peak indicates the formation of a chemical bond between silver and amino nitrogen [31]; and silver and carboxylate groups [32] of gum molecules.…”

Section: Resultsmentioning

confidence: 99%

“…It confirms that the gum is bound to the silver nanoparticle surface either through amino or carboxylate group or both. It is known to have close frequencies for the Ag–N and Ag–O stretching vibrations and the involvement of both N and O atoms in binding result in surface-enhanced Raman scattering (SERS) band broadening [30]. The broad ones at 1351 and 1523 cm –1 correspond to symmetric and asymmetric C = O stretching vibrations of carboxylate group, respectively [31].…”

Section: Resultsmentioning

confidence: 99%

“…The enhancement in the intensity of the CO 2 stretching vibration suggests the direct binding of the COO − group with the silver surface [32]. The broad band at 1040 and a sharp peak at 1123 cm –1 ; the one at 827 cm –1 comes from the C–H in plane bending and out of plane wag, respectively [30], from the saccharide structure of gum. Thus, from the preferential enhancement of these bands; it can be concluded that both amino and carboxylate groups of the gum are involved in the capping of the silver nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

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Size-controlled green synthesis of silver nanoparticles mediated by gum ghatti (Anogeissus latifolia) and its biological activity

2012

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BackgroundGum ghatti is a proteinaceous edible, exudate tree gum of India and is also used in traditional medicine. A facile and ecofriendly green method has been developed for the synthesis of silver nanoparticles from silver nitrate using gum ghatti (Anogeissus latifolia) as a reducing and stabilizing agent. The influence of concentration of gum and reaction time on the synthesis of nanoparticles was studied. UV–visible spectroscopy, transmission electron microscopy and X-ray diffraction analytical techniques were used to characterize the synthesized nanoparticles.ResultsBy optimizing the reaction conditions, we could achieve nearly monodispersed and size controlled spherical nanoparticles of around 5.7 ± 0.2 nm. A possible mechanism involved in the reduction and stabilization of nanoparticles has been investigated using Fourier transform infrared spectroscopy and Raman spectroscopy.ConclusionsThe synthesized silver nanoparticles had significant antibacterial action on both the Gram classes of bacteria. As the silver nanoparticles are encapsulated with functional group rich gum, they can be easily integrated for various biological applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Size-controlled green synthesis of silver nanoparticles mediated by gum ghatti (Anogeissus latifolia) and its biological activity

2012

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“…32,33 The high intensity of these bands clearly confirms that the Ag nanoparticle surface and carboxylate ions and/or phenyl groups are directly bound, the Raman signals of which are amplified by the SERS effect. 19 In addition, the appearance of a band at around 235 cm -1 , which has been associated with the stretching vibrations of Ag-N 31,32,34 and Ag-O 32,33 vibrations, confirms the formation of bonds between Ag nanoparticle surface and the nitrogen atom of amine groups 34 and the oxygen of carboxylate ions 32 and/or hydroxyl ions. Figure 9 shows the UV-visible spectra of the Ag samples and the two extracts.…”

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confidence: 77%

Microstructural, spectroscopic, and antibacterial properties of silver-based hybrid nanostructures biosynthesized using extracts of coriander leaves and seeds

Luna¹,

Barriga-Castro²,

Gómez-Treviño³

et al. 2016

IJN

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Coriander leaves and seeds have been highly appreciated since ancient times, not only due to their pleasant flavors but also due to their inhibitory activity on food degradation and their beneficial properties for health, both ascribed to their strong antioxidant activity. Recently, it has been shown that coriander leaf extracts can mediate the synthesis of metallic nanoparticles through oxidation/reduction reactions. In the present study, extracts of coriander leaves and seeds have been used as reaction media for the wet chemical synthesis of ultrafine silver nanoparticles and nanoparticle clusters, with urchin- and tree-like shapes, coated by biomolecules (mainly, proteins and polyphenols). In this greener route of nanostructure preparation, the active biocompounds of coriander simultaneously play the roles of reducing and stabilizing agents. The morphological and microstructural studies of the resulting biosynthesized silver nanostructures revealed that the nanostructures prepared with a small concentration of the precursor Ag salt (AgNO 3 =5 mM) exhibit an ultrafine size and a narrow size distribution, whereas particles synthesized with high concentrations of the precursor Ag salt (AgNO 3 =0.5 M) are polydisperse and formation of supramolecular structures occurs. Fourier transform infrared and Raman spectroscopy studies indicated that the bioreduction of the Ag − ions takes place through their interactions with free amines, carboxylate ions, and hydroxyl groups. As a consequence of such interactions, residues of proteins and polyphenols cap the biosynthesized Ag nanoparticles providing them a hybrid core/shell structure. In addition, these biosynthesized Ag nanomaterials exhibited size-dependent plasmon extinction bands and enhanced bactericidal activities against both Gram-positive and Gram-negative bacteria, displaying minimal inhibitory Ag concentrations lower than typical values reported in the literature for Ag nanoparticles, probably due to the synergy of the bactericidal activities of the Ag nanoparticle cores and their capping ligands.

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“…Raman spectroscopy has been traditionally used in the analyses of inorganic molecules and ions. [19,20] Improvements in Raman spectroscopic techniques have increased its applicability in the areas of biology and pharmaceuticals. Raman spectroscopy is increasingly being used to characterize simple amino acids to complex structures like proteins, enzymes, bacteria, and viruses.…”

Section: Introductionmentioning

confidence: 99%

Quantifying amino acid and protein substitution using Raman spectroscopy

Budhavaram

Barone

2011

J Raman Spectroscopy

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Raman spectroscopy can be a powerful tool for the characterization of modified amino acids and proteins. In addition to the potential for quantitative results, it offers the advantage of not requiring any sample preparation. Modification of amines and thiols on amino acids and proteins are common reactions used for medical, biological, food, and agricultural purposes. We hypothesized that the Raman spectrum could be used to quantify the reactions and would be more informative than typical characterization techniques such as the ninhydrin test. To prove the hypothesis, the amino acids alanine, cysteine, and lysine were modified with ethyl vinyl sulfone (EVS) using a nucleophilic addition reaction known as the Michael addition and the product was characterized using Raman spectroscopy. The Raman spectroscopy results were compared with ultraviolet-visible spectroscopy results based on ninhydrin analysis of the modified amino acids. The Raman spectroscopy analysis was able to discern site-specific reactions on the amino acids and suggested that more amino acid moieties were substituted than predicted using the ninhydrin test alone. Substitution of the full protein ovalbumin with EVS showed similar results. The ninhydrin test showed the substitution of primary amines and thiols but could not detect substitution of secondary amines remaining after loss of the primary amine.

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Concentration-dependent surface-enhanced Raman scattering of 2-benzoylpyridine adsorbed on colloidal silver particles

Cited by 66 publications

References 35 publications

Size-controlled green synthesis of silver nanoparticles mediated by gum ghatti (Anogeissus latifolia) and its biological activity

Size-controlled green synthesis of silver nanoparticles mediated by gum ghatti (Anogeissus latifolia) and its biological activity

Microstructural, spectroscopic, and antibacterial properties of silver-based hybrid nanostructures biosynthesized using extracts of coriander leaves and seeds

Quantifying amino acid and protein substitution using Raman spectroscopy

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