SciELO - Scientific Electronic Library Online

 
vol.50 issue4SYNTHESIS AND CHARACTERIZATION OF NEW CHITOSAN-O-ETHYL PHOSPHONATETHEORETICAL AND CHEMOMETRIC STUDY OF SUBSTITUTED OXAZINES author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Journal of the Chilean Chemical Society

On-line version ISSN 0717-9707

Abstract

LEYTO, P. et al. SURFACE ENHANCED RAMAN SPECTRUM OF NANOMETRIC MOLECULAR SYSTEMS. J. Chil. Chem. Soc. [online]. 2005, vol.50, n.4, pp.725-730. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072005000400014.

Surface-enhanced Raman spectroscopy (SERS) was demonstrated to be a useful and sensitive structural spectroscopic tool for the characterization of different types of supramolecular architectures, ideally suited for trace analysis. SERS spectra allowed to distinguish cell membrane components of the biomining bacterium Acidithiobacillus ferrooxidans and their physical and chemical variations caused by different growth media. Several SERS spectral modifications were arguments to propose different structures for two isolated model blue cooper proteins, i.e., hemocyanins belonging to mollusc Concholepas concholepas (CCH) and Megathura crenulata (KLH). The complex structure of a humic acid was demonstrated to be highly sensitive to the pH of the medium; a globular conformation predominated at lower pH, while a decurled structure was observed at higher pH. Finally, the SERS technique using different excitation laser lines allowed to characterizing a carbon nanotube as a single-walled species, with metallic electronic characteristics; these species coexisted with different diameters

Keywords : SERS; Bacteria; Carbonnanotube; Blue copper proteins; Humic acid.

        · text in English

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License