Monteiro, Nilson Kobori [UNESP]Aranda-Selverio, Gabriel [UNESP]Degli Exposti, Diego Tadeu [UNESP]Corradi da Silva, Maria de Lourdes [UNESP]Macedo Lemos, Eliana Gertrudes [UNESP]Campanharo, Joao Carlos [UNESP]Meira Silveira, Joana Lea2014-05-202014-05-202012-01-01Quimica Nova. São Paulo: Soc Brasileira Quimica, v. 35, n. 4, p. 705-708, 2012.0100-4042http://hdl.handle.net/11449/21852CHEMICAL CHARACTERIZATION of THE GELS PRODUCED BY THE DIAZOTROPHIC BACTERIA. The exopolysaccharides with characteristics of gel produced by Rhizobiun tropici (EPSRT) and Mesorhizobium sp (EPSMR) are acidic heteropolysaccharide composed mainly of glucose and galactose in a molar ratio of 4:1 and 5:1 respectively, with traces of mannose (similar to 1%). Chemical analysis showed the presence of uronic acid, pyruvate and acetyl-substituents in the structures of both polymers. Experiments of gel permeation chromatography and polyacrylamide gel electrophoresis showed that EPSRT, and EPSMR are homogeneous molecules with low grade of polydispersity. The EPS were characterized using spectroscopic techniques of FT-IR, H-1 and C-13-NMR.705-708poracid exopolysaccharideRhizobium tropiciMesorlazobium sp.ArtigoWOS:000304226400009Acesso aberto