Publicaciones 2011-2020

@article{marcaida2017optimization,
title = {Optimization of Sample Treatment for the Identification of Anthraquinone Dyes by Surface-Enhanced Raman Spectroscopy},
author = { I. Marcaida and M. Maguregui and H. Morillas and C. Garcia-Florentino and V. Pintus and T. Aguayo and M. Campos-Vallette and J. Madariaga},
url = {/brokenurl#<Go to ISI>://WOS:000395057500024},
doi = {10.1007/s00216-016-0169-6},
issn = {1618-2642},
year = {2017},
date = {2017-01-01},
journal = {Analytical and Bioanalytical Chemistry},
volume = {409},
number = {8},
pages = {2221-2228},
abstract = {The study and characterization of old artifacts such as pigments requires the use of techniques that need a small amount of sample to perform the analysis because of the high value of these samples. In recent years, organic molecules such as anthraquinone dyes have been identified by surface-enhanced Raman spectroscopy (SERS). However, different sample treatments must be applied to isolate the organic dye from the mordant, which produces great fluorescence in the Raman measurements. In this work, optimization of sample treatment for the SERS analysis of anthraquinone dyes was performed. Sample mass, the organic solvent, and its volume were optimized and different slide materials and excitation lasers were compared to choose the best conditions for the identification of the dyes. The optimization of sample treatment resulted in 5 mg of sample as the optimum amount. Further, two consecutive extractions with 0.5 mL of ethyl acetate was the best option for the extraction of the dye. A quartz slide was used instead of a glass slide to reduce background signal, and an excitation laser of 532 nm offers better results than one of 785 nm. The optimized method was applied to the characterization of the dyes used in Pompeian pink and purple lake pigments. Alizarin and purpurin anthraquinone dyes, obtained from madder lake, were identified as the organic colorants. The SERS results were confirmed by those obtained by means of UV-visible spectroscopy.},
keywords = {anthraquinone, dyestuffs, extraction, lake lake, liquid-liquid madder nanoparticles, pigment, pigments, purple, raman scattering, sers, silver, spectroscopy, surface-enhanced},
pubstate = {published},
tppubtype = {article}
}

@article{RN331,
title = {Raman and Surface Enhanced Raman Scattering Study of the Orientation of Cruciform 9,10-Anthracene Thiophene and Furan Derivatives Deposited on a Gold Colloidal Surface},
author = { J. Munoz-Perez and P. Leyton and C. Paipa and J.P. Soto and J. Brunet and J.S. Gomez-Jeria and M. Campos-Vallette},
url = {/brokenurl#<Go to ISI>://WOS:000381167800023},
doi = {10.1016/j.molstruc.2016.06.002},
issn = {0022-2860},
year = {2016},
date = {2016-01-01},
journal = {Journal of Molecular Structure},
volume = {1122},
pages = {198-204},
publisher = {2016 Elsevier B.V.},
abstract = {The 9,10-di(thiophen-2-yl)anthracene (TAT), 9,10-di(furan-2-yl)anthracene (FAF) and 2-[(10-(thiophen-2-yl)anthracen-9-yl)]furan (TAF) cruciform molecular systems were synthesized using one-step coupling reactions and structurally characterized via Raman, infrared, H-1 NMR, C-13 NMR and mass spectroscopies. The orientation of the analytes on a gold colloidal surface was inferred from a surface-enhanced Raman scattering (SERS) study. The metal surface interaction was driven by the S and O atoms of the thiophene and furan alpha-substituents, and the plane of the anthracene fragment remained parallel to the surface. Theoretical calculations based on a simplified molecular model for the analyte-surface interaction provide a good representation of the experimental data.},
keywords = {cluster, cruciform, electronics, gold metal molecular monolayers, nanoparticles, pi-systems, polycyclic raman scattering, self-assembled sers, silver, spectroscopy, spectrum, surface-enhanced vibrational-spectra},
pubstate = {published},
tppubtype = {article}
}

@article{RN317,
title = {Sers Spectrum of Gallic Acid Obtained from a Modified Silver Colloid},
author = { C. Garrido and G. Diaz-Fleming and M. Campos-Vallette},
url = {/brokenurl#<Go to ISI>://WOS:000375501500010},
doi = {10.1016/j.saa.2016.03.028},
issn = {1386-1425},
year = {2016},
date = {2016-01-01},
journal = {Spectrochimica Acta Part a-Molecular and Biomolecular Spectroscopy},
volume = {163},
pages = {68-72},
publisher = {2016 Elsevier B.V.},
abstract = {Two different crystals of the gallic acid were microscopically separated from a p.a. commercial product. The Raman spectra analysis allowed distinguishing monomeric and dimeric structures. The vibrational wave numbers were computed using DFT quantum chemical calculations. The data obtained from wave number calculations are used to assign vibrational bands obtained in the Raman spectrum. The dimer, characterized as ellagic acid, involves the carboxyl and hydroxyl moieties. The Raman spectrum in Water solution of each species is dominated by the monomeric form. A low negatively charged Ag colloid allowed obtain to the best of our knowledge, the first surface enhanced Raman scattering (SERS) spectrum of the gallic acid. The possible electrophilic attacking sites of the title molecule are identified using MEP surface plot study and the orientation of the analyte on the metal surface is proposed tilted to the surface.},
keywords = {calculations, chemical colloid, dft enhanced gallic identification modified quantum raman-scattering, sers, silver},
pubstate = {published},
tppubtype = {article}
}

@article{RN261,
title = {Raman and Surface Enhanced Raman Signals of the Sensor 1-(4-Mercaptophenyl)-2,4,6-Triphenylpyridinium Perchlorate},
author = { F. Celis and M. Campos-Vallette and J.C. Vega and J.S. Gomez-Jeria and C. Aliaga},
url = {/brokenurl#<Go to ISI>://WOS:000361545700018},
doi = {10.4067/S0717-97072015000200018},
issn = {0717-9707},
year = {2015},
date = {2015-01-01},
journal = {Journal of the Chilean Chemical Society},
volume = {60},
number = {2},
pages = {2944-2948},
abstract = {The sensor 1-(4-mercaptophenyl)-2,4,6-triphenylpyridinium perchlorate compound was vibrationally characterized using Raman and the Surface-Enhanced Raman techniques, SERS and Shell-Isolated Nanoparticles-Enhanced Raman Spectroscopy (SHINERS). The Raman spectrum was analyzed and the band assignment was supported using DFT data at the B3LYP/6-31G(d) level. SERS data allowed infer about the orientation of the analyte on the naked Ag surface. EHT calculations for an Ag/analyte model represent well the SERS spectrum supporting the Ag-S bond formation. The SHINERS spectrum was obtained by using Ag
@SiO2 nanoparticles prepared at two different time of the SiO2 coating process. The most intense SHINERS spectral signals of the compound (100 nM) were obtained after 20 minutes of the Ag
@SiO2 formation. No charge-transfer was concluded from the SHINERS experiments.},
keywords = {density dft dyes, dynamics, eht halochromism, hydrocarbons, perchlorate, raman, scattering, sers, shiners, silver, solvent spectroscopy},
pubstate = {published},
tppubtype = {article}
}

@article{RN262,
title = {Interaction of the Clpffd Peptide with Gold Nanospheres. A Raman, Surface Enhanced Raman Scattering and Theoretical Study},
author = { A.M. Vera and J.J. Carcamo and A.E. Aliaga and J.S. Gomez-Jeria and M.J. Kogan and M. Campos-Vallette},
url = {/brokenurl#<Go to ISI>://WOS:000342718700034},
doi = {10.1016/j.saa.2014.06.116},
issn = {1386-1425},
year = {2015},
date = {2015-01-01},
journal = {Spectrochimica Acta Part a-Molecular and Biomolecular Spectroscopy},
volume = {134},
pages = {251-256},
publisher = {2014 Elsevier B.V.},
abstract = {In a previous work we demonstrated that toxic aggregates of the protein beta-amyloid (ATA beta) involved in the Alzheimer's disease (AD) can be destabilized upon electromagnetic irradiation of the peptide Cys-Leu-Pro-Phe-Phe-Asp (CLPFFD) adsorbed on gold nanospheres (AuNSs). For a selective recognition of the therapeutic target (i.e. ATA beta) of AD by the conjugates peptide-nanoparticle it is relevant to understand how the interaction between attached ligands and nanoparticles occurs. In this work a surface enhanced Raman scattering spectroscopy (SERS) study of the interactions of CLPFFD with AuNSs of 10 nm average diameter was carried out. The SERS data suggest that phenylalanine displays its aromatic ring coplanar to the surface which is supported by theoretical data obtained from molecular mechanics (MM) and Extended Huckel Theory (EHT) calculations.},
keywords = {alzheimer-disease, anti-aggregation approximations, assemblies, beta-amyloid, calculations, clpffd extended hartree-fock htickel molecular-orbital nanoparticles, of peptide peptide, protein, sers, silver, spectroscopy, stability theories, theory type},
pubstate = {published},
tppubtype = {article}
}

@article{RN145,
title = {Solid State Pathways to Complex Shape Evolution and Tunable Porosity During Metallic Crystal Growth},
author = { C. Diaz and G. Carriedo and M.L. Valenzuela and L. Zuniga and C. O'dwyer},
url = {/brokenurl#<Go to ISI>://WOS:000324229300005},
doi = {10.1038/srep02642},
issn = {2045-2322},
year = {2013},
date = {2013-01-01},
journal = {Scientific Reports},
volume = {3},
abstract = {Growing complex metallic crystals, supported high index facet nanocrystal composites and tunable porosity metals, and exploiting factors that influence shape and morphology is crucial in many exciting developments in chemistry, catalysis, biotechnology and nanoscience. Assembly, organization and ordered crystallization of nanostructures into complex shapes requires understanding of the building blocks and their association, and this relationship can define the many physical properties of crystals and their assemblies. Understanding crystal evolution pathways is required for controlled deposition onto surfaces. Here, complex metallic crystals on the nano-and microscale, carbon supported nanoparticles, and spinodal porous noble metals with defined inter-feature distances in 3D, are accomplished in the solid-state for Au, Ag, Pd, and Re. Bottom-up growth and positioning is possible through competitive coarsening of mobile nanoparticles and their site-specific crystallization in a nucleation-dewetted matrix. Shape evolution, density and growth mechanism of complex metallic crystals and porous metals can be imaged during growth.},
keywords = {carbon gold nanocrystals, nanoparticles, silver},
pubstate = {published},
tppubtype = {article}
}

@article{RN39i,
title = {Raman and Surface-Enhanced Raman Scattering in the Study of Human Rotator Cuff Tissues after Shock Wave Treatment},
author = { J.J. Carcamo and A.E. Aliaga and E. Clavijo and M. Branes and M. Campos-Vallette},
url = {/brokenurl#<Go to ISI>://WOS:000300836900011},
doi = {10.1002/jrs.3019},
issn = {0377-0486},
year = {2012},
date = {2012-01-01},
journal = {Journal of Raman Spectroscopy},
volume = {43},
number = {2},
pages = {248-254},
publisher = {2011 John Wiley & Sons, Ltd.},
abstract = {Important improvements of diseases of the rotator cuff supraspinatus tendons are seen after shock wave (SW) treatment. Neo-angiogenesis stimulation and hypercellularization result from short periods of treatment. The present work is an attempt to provide a first approach to these bioprocesses, most likely associated with structural aspects resulting from biochemical changes brought about by the SW. Immunohistochemical data indicate that collagen areas in the tissues are influenced the most by the SW. Presence of additional collagens I and III by the SW treatment is inferred from an observed increase of the tissue's tinctorial properties. The tools selected for our studies are Raman spectroscopy and the ultrasensitive surface-enhanced Raman scattering (SERS). Here we extract information from 1016 SERS spectra of 52 biopsies of human tendon tissues on Ag nanoparticles before and after the SW treatment. The spectral information is analyzed on the basis of Raman and SERS data of collagen types I and III and their most abundant amino acid components. SERS spectra of tissues reveal the presence of characteristic modes related mainly to amino acids. It has been found that the main differences between both tissue samples could be correlated with the structural conformational aspects of collagen.},
keywords = {amino-acids, collagen, collagens, cuff, gold infrared-spectra, nanoparticles, raman, rotator sers, shockwaves, silver, single-molecule, spectroscopy},
pubstate = {published},
tppubtype = {article}
}

@article{RN41f,
title = {Raman, Infrared, Sers and Theoretical Study of 3-(1-Phenylpropan-2-Ylamino) Propanenitrile, Fenproporex},
author = { G. Diaz-Fleming and F. Celis and M. Campos-Vallette and A.E. Aliaga and M. Escobar and R. Koch},
url = {/brokenurl#<Go to ISI>://WOS:000293001000003},
doi = {10.1002/jrs.2882},
issn = {0377-0486},
year = {2011},
date = {2011-01-01},
journal = {Journal of Raman Spectroscopy},
volume = {42},
number = {7},
pages = {1497-1504},
publisher = {2011 John Wiley & Sons, Ltd.},
abstract = {Infrared, Raman and surface-enhanced Raman scattering (SERS) spectra of 3-(1-phenylpropan-2-ylamino) propanenitrile (fenproporex) have been recorded. Density functional theory (DFT) with the B3LYP functional was used for optimizations of ground state geometries and simulation of Raman and SERS vibrational spectra of this molecule. Bands of the vibrational spectra were assigned in detail. The comparison of SERS spectra obtained by using colloidal silver and gold nanoparticles with the corresponding Raman spectrum reveals enhancement and shifts in bands, suggesting a possible partial charge-transfer mechanism in the SERS effect. Information about the orientation of fenproporex on the nanometer-sized metal structures is also obtained.},
keywords = {calculations, density-functional dft elements, fenproporex, gold, infrared, raman, scattering, sers, silver, spectroscopy, surface-enhanced temperature theory},
pubstate = {published},
tppubtype = {article}
}