Publicaciones 2011-2020

@article{RN154,
title = {The Effect of the Ph on the Interaction of L-Arginine with Colloidal Silver Nanoparticles. A Raman and Sers Study},
author = { C. Garrido and T. Aguayo and E. Clavijo and J.S. Gomez-Jeria and M. Campos-Vallette},
url = {/brokenurl#<Go to ISI>://WOS:000323180700006},
doi = {10.1002/jrs.4331},
issn = {0377-0486},
year = {2013},
date = {2013-01-01},
journal = {Journal of Raman Spectroscopy},
volume = {44},
number = {8},
pages = {1105-1110},
publisher = {2013 John Wiley & Sons, Ltd.},
abstract = {Raman and surface enhanced Raman scattering (SERS) spectroscopies were used to study the pH effect (7 to 9) on the interaction of arginine (Arg) with colloidal Ag nanoparticles (AgNps). A new methodology was implemented in order to obtain reproducible SERS spectra in solution. The dependence of the Arg concentration on the stability of the AgNps is discussed. A pH increasing of the colloidal solution to the limits of the Arg pKa(2) value induces a preferential and stable Arg-metal interaction. potential measurements of the Arg-AgNps system at different pH conditions studied provide information about the Arg-AgNps interaction; the pH increasing favors the interaction. SERS spectra at pH 7 indicate that the molecule interacts with the Ag surface only through the guanidinium fragment. By increasing the pH to 9, the molecule adopts a new conformation on the surface; the metal-analyte interaction is verified through the guanidinium, carboxylate and the aliphatic moieties. In addition, theoretical calculations performed by using the extended Huckel method for a model of Arg interacting with an Ag surface support the observed SERS results.},
keywords = {amino-acids, aromatic-hydrocarbons, enhanced extended huckel hydrochloride l-arginine, l-lysine, polycyclic potential protein, raman scattering scattering, spectra, spectroscopy, surface surface, temperature, theory zeta},
pubstate = {published},
tppubtype = {article}
}

@article{carcamo2012raman,
title = {Raman Study of the Shockwave Effect on Collagens},
author = { J.J. Carcamo and A.E. Aliaga and E. Clavijo and M. Branes and M. Campos-Vallette},
url = {/brokenurl#<Go to ISI>://WOS:000300515500052},
doi = {10.1016/j.saa.2011.10.049},
issn = {1386-1425},
year = {2012},
date = {2012-01-01},
journal = {Spectrochimica Acta Part a-Molecular and Biomolecular Spectroscopy},
volume = {86},
pages = {360-365},
publisher = {2011 Elsevier B.V.},
abstract = {The Raman spectra (1800-200 cm(-1)) of isolated dried collagen types land ill were recorded at different times after shockwave (SW) application in aqueous media. SWs were applied in a single session. One week after the SW application the vibrational data analysis indicates changes in the conformation of the collagens; orientational changes are also inferred. During the next three weeks collagens tended to recover the conformation and orientation existing before SW application.},
keywords = {amino-acids, collagens, conformation, dependence, infrared-spectra, raman, scattering, shockwaves, spectroscopy, time tissues},
pubstate = {published},
tppubtype = {article}
}

@article{garrido2012interaction,
title = {Interaction of the C-Terminal Peptide from Pigeon Cytochrome C with Silver Nanoparticles. A Raman, Sers and Theoretical Study},
author = { C. Garrido and A.E. Aliaga and J.S. Gomez-Jeria and J.J. Carcamo and E. Clavijo and M. Campos-Vallette},
url = {/brokenurl#<Go to ISI>://WOS:000304686400014},
doi = {10.1016/j.vibspec.2012.01.011},
issn = {0924-2031},
year = {2012},
date = {2012-01-01},
journal = {Vibrational Spectroscopy},
volume = {61},
pages = {94-98},
publisher = {2012 Elsevier B.V.},
abstract = {The Raman and surface-enhanced Raman scattering (SERS) spectra of the C-terminal peptide of pigeon cytochrome C (PCC87-104). were recorded. This peptide is widely used to study the immune response in vivo. Hydrophobicity and net charge parameters of PCC87-104, allowed prediction of the nature of its interaction with colloidal nanostructured silver surfaces. The SERS spectrum provided information about the organization and orientation of PCC87-104 on the surface of silver nanoparticles (AgNPs). The batch to batch reproducible SERS spectra were obtained by adding the colloidal AgNPs solution onto the dried analyte sample. On the basis of the SERS information and the analysis of the net charge of each amino acid residue in the peptide sequence, it is concluded that the interaction of the peptide and the AgNPs is mainly induced and oriented by the lysine residues. The spectroscopic results are supported by quantum chemical calculations, performed by using Extended Huckel theory for a model of PCC87-104 interacting with a silver surface.},
keywords = {amino-acids, approximations aromatic-hydrocarbons, charge, enhanced extended hartree-fock huckel hydrophobicity, molecular-orbital net pcc87-104 peptide, polycyclic proteins, raman raman, scattering, spectroscopy, surface, surface-enhanced theories, theory, type},
pubstate = {published},
tppubtype = {article}
}

@article{carcamo2012proline,
title = {Proline and Hydroxyproline Deposited on Silver Nanoparticles. A Raman, Sers and Theoretical Study},
author = { J.J. Carcamo and A.E. Aliaga and E. Clavijo and C. Garrido and J.S. Gomez-Jeria and M. Campos-Vallette},
url = {/brokenurl#<Go to ISI>://WOS:000305391800012},
doi = {10.1002/jrs.3092},
issn = {0377-0486},
year = {2012},
date = {2012-01-01},
journal = {Journal of Raman Spectroscopy},
volume = {43},
number = {6},
pages = {750-755},
publisher = {2011 John Wiley & Sons, Ltd.},
abstract = {The Raman and surface-enhanced Raman scattering (SERS) spectra of l-proline (Pro) and trans-4-hydroxy- l-proline (Hyp) were recorded. SERS spectra were obtained on colloidal Ag prepared by reduction with hydroxylamine. Allowing sufficient time for Pro and Hyp to adjust in the colloidal solution resulted fundamentally in obtaining unique and reproducible SERS spectra. Hyp stabilizes on the surface more rapidly than Pro. The spectral analysis indicates that Pro interacts with the Ag surface through the carboxylate group. The interaction of Hyp with the metal surface occurs through the amino, methylene and carboxylate moieties of the molecule. The spectroscopic results are supported by quantum chemical calculations, performed using extended Huckel theory (EHT) of the title compounds interacting with an Ag cluster model. The assignment of the Raman bands was supported by a normal coordinate analysis performed through Becke, three-parameter, LeeYangParr/6-311?G*?+?calculations.},
keywords = {amino-acids, approximations, calculations, l-proline, molecular-orbital raman raman, scattering, spectra spectroscopy, surface-enhanced theoretical theories, trans-4-hydroxy-},
pubstate = {published},
tppubtype = {article}
}

@article{RN29d,
title = {Influence of Tio2 on Prebiotic Thermal Synthesis of the Gly-Gln Polymer},
author = { P. Leyton and R. Saladino and C. Crestini and M. Campos-Vallette and C. Paipa and A. Berrios and S. Fuentes and R.A. Zarate},
url = {/brokenurl#<Go to ISI>://WOS:000304150300004},
doi = {10.1007/s00726-011-0939-6},
issn = {0939-4451},
year = {2012},
date = {2012-01-01},
journal = {Amino Acids},
volume = {42},
number = {6},
pages = {2079-2088},
abstract = {The role of the titanium dioxide (rutile and anatase) with and without room light on the thermal synthesis of the glycine--glutamine (Gly-Gln) polymer is described. The efficiency in percentage of polymerization with room light was increased in 6% in the presence of rutile and in 23% in the presence of anatase. The thermal synthesis in the molten state was carried out in the absence and presence of both oxides. In all cases, the vibrational spectra showed characteristic group frequencies corresponding to a polypeptide structure. No spectral differences were observed by room light effect on the polymer on rutile. However, the polymer obtained in the presence of anatase and room light shows spectral changes associated with the formation of shorter new abundant and conformationally different species compared with the original polymer. The SEM-EDX characterization of the solid phase involved in the thermal synthesis showed that the morphology of the polypeptide is different in the presence of rutile compared to anatase. The SDS-PAGE and GPC results suggest that smaller chains are formed in the presence of both oxides and the distribution of the size and weight of each polymer molecule is completely different when the condensation is performed in the presence of anatase or rutile. Nuclear magnetic resonance analyses confirmed the incorporation of both Gly and Gln residues in the polymers, with a prevalence of Gly. Both possible sequences -GlyGln- and -GlnGly- were also detected.},
keywords = {amino-acids, chemistry, condensation conditions, crystalline diketopiperazine, dioxide, dynamics, earth formation ft-ir glutamic glycine, peptide prebiotic primitive reaction, self-disproportionation, spectra, spectroscopy, synthesis, thermal titanium vibrational},
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}
}