Surface-enhanced Raman scattering of flavonoids

Jurasekova, Z.; Garcı́a-Ramos, José Vicente; Domingo, Concepción; Sánchez-Cortés, Santiago

doi:10.1002/jrs.1634

Cited by 115 publications

(110 citation statements)

References 19 publications

(10 reference statements)

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“…On the other hand, the interaction with metals is part of the biological activity of these biomolecules, and it is related to their antioxidant activity. The SERS spectra of flavonoids indicate that there are two main instability sources in these molecules: the cathecol ring and benzopyrone [27]. The adsorption of flavonoids on metal surface can induce a chemical change similar to that found for cathecol.…”

Section: Resultsmentioning

confidence: 99%

Importance of Metal–Adsorbate Interactions for the Surface-enhanced Raman Scattering of Molecules Adsorbed on Plasmonic Nanoparticles

et al. 2007

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The interaction between adsorbates of different nature and plasmonic nanoparticles is reviewed here on the basis of the work done in our laboratory in the past few years. The paper is structured for analyzing the interaction of adsorbates with metal nanoparticles as function of the interacting atom (O, N, or S) and the adsorbate conformation. In the study of the adsorption of molecular species on metals, it is necessary to take into account that different interaction mechanisms are possible, leading to the existence of different molecular forms (isomers or conformers). These forms can be evidenced by changing the excitation wavelength, due to a resonant selection of these wavelengths. Charge-transfer complexes and electrostatic interactions are the usual driving forces involved in the interaction of adsorbates on metal surfaces when these metallic systems are used in wet conditions. The understanding of the metal-adsorbate interaction is crucial in the surface functionalization of metal surfaces, which has a growing importance in the development of sensing systems or optoelectronic devices. In relation to this, special attention is paid in this work to the study of the adsorption of calixarene host molecules on plasmonic nanoparticles.

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Section: Resultsmentioning

confidence: 99%

Importance of Metal–Adsorbate Interactions for the Surface-enhanced Raman Scattering of Molecules Adsorbed on Plasmonic Nanoparticles

et al. 2007

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“…Degradation also occurs in the presence of silver nanoparticles with the formation of different condensation products between the different polyphenolic rings, which give appreciable SERS bands in the 400-500 cm −1 region. [24,47,48] For this reason, it is much more difficult to assign the individual SERS spectra of flavonols in their mixtures, as in the present situation. In any case, comparison with the SERS spectra of quercetin, [47] morin and kaempferol [49] excited at 514.5 nm, together with the appearance of bands in the above-mentioned region, allows us to confirm the presence of flavonols in the respective dyed fibers.…”

Section: Flavonoidsmentioning

confidence: 89%

Extractionless non‐hydrolysis surface‐enhanced Raman spectroscopic detection of historical mordant dyes on textile fibers

Jurasekova

Puerto

Brunò

et al. 2010

J Raman Spectroscopy

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Alizarin and carminic acid have been detected in reference wool and linen fibers dyed with madder and cochineal, respectively, through surface-enhanced Raman scattering (SERS) measurements carried out directly on the fiber, without previous hydrolysis of the mordant-dye complex. For such purpose, Ag nanoparticles were produced and immobilized in situ via the laser photoreduction of a silver nitrate aqueous solution in contact with the fiber. Control SERS spectra of pure dyes (alizarin, purpurin and carminic acid, as well as of mixtures of the first two) on similar Ag nanoparticles were also obtained. The method has been applied to one archeological Coptic textile (6th-8th A.D.) of Egyptian origin, where alizarin has been clearly identified. Other mordant dyes of the flavonoids family (luteolin, apigenin and flavonols) have also been identified by the same SERS method in wool fibers dyed with natural plants, mainly used in Central and South America (Dyer's greenweed, old fustic, onion and chilca) following pre-Columbian dying recipes.

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“…This effect has been attributed to the polymerisation of the catechol B-ring and the interaction with the silver surface. 32 In addition, in the Raman spectrum of the Cu-Cat system new Raman peaks (i.e. 1492, 1393, 1335, 1319 cm 1 ), as well as the significant spectral changes (i.e.…”

Section: Raman and Ir Studiesmentioning

confidence: 99%

Spectroscopic and pulse radiolysis studies of the antioxidant properties of (+)catechin: metal chelation and oxidizing radical scavenging

Torreggiani¹,

Jurasekova²,

Sánchez-Cortés³

et al. 2007

J Raman Spectroscopy

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Catechin (5,7,3 ,4 -tetrahydroxyflavan-3-ol, Cat), a compound suggested to give protection to living organisms both by direct scavenging of free radicals and metal chelation, was investigated in the presence of Zn(II) and Cu(II) ions by different techniques.The UV/vis, Raman and IR studies were useful to assess the chelation sites, the relevant interaction of Cat with Cu(II) ions, as well as the weak affinity with Zn(II). Cat acts as a bidentate ligand through the catechol moiety on B-ring, but the metal complex structure depends on the metal. In particular, some autoxidation processes may be involved in the formation of the Cu-Cat complexes. The protonation state of the B-ring plays an important role both in metal chelation and scavenging activity of Cat.Information on the reactivity of the free Cat towards oxidizing radicals with different redox properties were obtained by pulse radiolysis. In all cases the relatively stable phenoxyl radicals resulted to be formed.

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Surface-enhanced Raman scattering of flavonoids

Cited by 115 publications

References 19 publications

Importance of Metal–Adsorbate Interactions for the Surface-enhanced Raman Scattering of Molecules Adsorbed on Plasmonic Nanoparticles

Importance of Metal–Adsorbate Interactions for the Surface-enhanced Raman Scattering of Molecules Adsorbed on Plasmonic Nanoparticles

Extractionless non‐hydrolysis surface‐enhanced Raman spectroscopic detection of historical mordant dyes on textile fibers

Spectroscopic and pulse radiolysis studies of the antioxidant properties of (+)catechin: metal chelation and oxidizing radical scavenging

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