Adsorption of CGA on colloidal silver particles: DFT and SERS study

Biswas, Nandita; Kapoor, Sudhir; Mahal, H. S.; Mukherjee, Tulsi

doi:10.1016/j.cplett.2007.07.049

Cited by 95 publications

(51 citation statements)

References 25 publications

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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: 73%

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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confidence: 73%

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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“…So far, a few publications that concern the spectral analyses sometimes supported by calculations (mainly Raman spectra) of different CQAs have been reported. DFT (B3LYP with 6-31G* and LANL2DZ basis sets) calculations were carried out for an interpretation of SERS spectra of chlorogenic acid (Biswas, Kapoor, Mahal, & Mukherjee, 2007). Experimental and theoretical (at B3LYP/6-311G(d,p) level) Raman spectra for 3-O-caffeoylquinic acid (3-CQA), 4-O-caffeoylquinic acid (4-CQA) and 5-Ocaffeoylquinic acid (5-CQA) were also reported (Mishra, Tandon, Eravuchira, El-Abassy, & Materny, 2013;Eravuchira et al, 2012).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

5-O-Caffeoylquinic acid: A spectroscopic study and biological screening for antimicrobial activity

Bajko

Kalinowska

Borowski

et al. 2016

LWT

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“…An important aspect of SERS is its potential in probing the interaction between various adsorbates and metallic surfaces [3][4][5][6][7][8][9][10][11][12][13][14]. Application of the 'surface selection rules' [15,16] provides information on the sites of binding and the molecular orientation on the metal surface.…”

Section: Introductionmentioning

confidence: 99%

Probing the adsorption mechanism in thiamazole bound to the silver surface with Surface-enhanced Raman Scattering and DFT

Biswas

Thomas

Sarkar

et al. 2009

Chemical Physics Letters

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Adsorption of CGA on colloidal silver particles: DFT and SERS study

Cited by 95 publications

References 25 publications

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

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

5-O-Caffeoylquinic acid: A spectroscopic study and biological screening for antimicrobial activity

Probing the adsorption mechanism in thiamazole bound to the silver surface with Surface-enhanced Raman Scattering and DFT

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