2014 |
Ogalde, J P; Salas, C O; Lara, N; Leyton, P; Paipa, C; Campos-Vallette, M; Arriaza, B Multi-Instrumental Identification of Orpiment in Archaeological Mortuary Contexts Artículo de revista Journal of the Chilean Chemical Society, 59 (3), pp. 2571-2573, 2014, ISSN: 0717-9707. Resumen | Enlaces | BibTeX | Etiquetas: ceramics, chile, chorrillos, color, glass manuscripts, northern pararealgar, persian pigments, raman raman, realgar, sem-edx, spectra, spectroscopy @article{RN210, title = {Multi-Instrumental Identification of Orpiment in Archaeological Mortuary Contexts}, author = { J.P. Ogalde and C.O. Salas and N. Lara and P. Leyton and C. Paipa and M. Campos-Vallette and B. Arriaza}, url = {/brokenurl#<Go to ISI>://WOS:000347833800010}, doi = {10.4067/S0717-97072014000300010}, issn = {0717-9707}, year = {2014}, date = {2014-01-01}, journal = {Journal of the Chilean Chemical Society}, volume = {59}, number = {3}, pages = {2571-2573}, abstract = {This paper reports on an unknown yellowish mineral compound found in an archaeological context from Chorrillos cemetery (Calama, Chile) dating to the Early Formative period (800 - 200 B.C.). We used optic microscopy, SEM, EDX, H-1-RMN, C-13-RMN, and infrared (IR) and Raman spectroscopy to tease out the chemical and molecular composition of the sample. The microscopic images show amorphous yellowish granulates with heterogeneous chemical surfaces. H-1-RMN and C-13-RMN negative results show that the sample is free of organic matter. The SEM and EDX indicate the presence of arsenic and sulfur in the sample. The IR and Raman analyses suggest the presence of orpiment which is a toxic yellow arsenic sulfide mineral.}, keywords = {ceramics, chile, chorrillos, color, glass manuscripts, northern pararealgar, persian pigments, raman raman, realgar, sem-edx, spectra, spectroscopy}, pubstate = {published}, tppubtype = {article} } This paper reports on an unknown yellowish mineral compound found in an archaeological context from Chorrillos cemetery (Calama, Chile) dating to the Early Formative period (800 - 200 B.C.). We used optic microscopy, SEM, EDX, H-1-RMN, C-13-RMN, and infrared (IR) and Raman spectroscopy to tease out the chemical and molecular composition of the sample. The microscopic images show amorphous yellowish granulates with heterogeneous chemical surfaces. H-1-RMN and C-13-RMN negative results show that the sample is free of organic matter. The SEM and EDX indicate the presence of arsenic and sulfur in the sample. The IR and Raman analyses suggest the presence of orpiment which is a toxic yellow arsenic sulfide mineral. |
2012 |
Garrido, C; Aliaga, A E; Gomez-Jeria, J S; Carcamo, J J; Clavijo, E; Campos-Vallette, M Interaction of the C-Terminal Peptide from Pigeon Cytochrome C with Silver Nanoparticles. A Raman, Sers and Theoretical Study Artículo de revista Vibrational Spectroscopy, 61 , pp. 94-98, 2012, ISSN: 0924-2031. Resumen | Enlaces | BibTeX | Etiquetas: 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 @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} } 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. |
2014 |
Multi-Instrumental Identification of Orpiment in Archaeological Mortuary Contexts Artículo de revista Journal of the Chilean Chemical Society, 59 (3), pp. 2571-2573, 2014, ISSN: 0717-9707. |
2012 |
Interaction of the C-Terminal Peptide from Pigeon Cytochrome C with Silver Nanoparticles. A Raman, Sers and Theoretical Study Artículo de revista Vibrational Spectroscopy, 61 , pp. 94-98, 2012, ISSN: 0924-2031. |