http://www3.interscience.wiley.com/journal/122662184/abstract Characterization of sodium alginate and its block fractions by surface- enhanced Raman spectroscopy Marcelo M. Campos-Vallette, Nancy P. Chandía, Ernesto Clavijo, David Leal, Betty Matsuhiro, Igor O. Osorio-Román, Simonet Torres Journal of Raman Spectroscopy, 23 Oct 2009 DOI: 10.1002/jrs.2517 Please send to: b**********[email protected] Thanks!