Data/hora: 01/06/2024 01:17:41

Biblioteca(s): | Embrapa Meio Ambiente.
Data corrente: | 14/12/2012
Data da última atualização: | 14/12/2012
Autoria: | PAULO, E. M.; BOFFO, E. F.; BRANCO, A.; VALENTE, A. M. M. P.; MELO, I. S. de; FERREIRA, A. G.; ROQUE, M. R. de A.; ASSIS, S. A. de.
Afiliação: | ELINALVA M. PAULO, UEFS; ELISANGELA F. BOFFO, UFBA; ALEXSANDRO BRANCO, UEFS; ÂNGELA M. M. P. VALENTE; ITAMAR SOARES DE MELO, CNPMA; ANTONIO G. FERREIRA, UFSCar; MILTON R. A. ROQUE, UFBA; SANDRA A. DE ASSIS, UEFS.
Título: | Production, extraction and characterization of exopolysaccharides produced by the native Leuconostoc pseudomesenteroides R2 strain.
Ano de publicação: | 2012
Fonte/Imprenta: | Anais da Academia Brasileira de Ciências, Rio de Janeiro, v. 84, n. 2, p. 495-507, 2012.
Idioma: | Inglês
Conteúdo: | ABSTRACT: The genus Leuconostoc belongs to a group of lactic acid bacteria usually isolated from fermented vegetables, which includes species involved in the production of exopolysaccharides (EPS). These biopolymers possess considerable commercial potential. Because of the wide variety of industrial applications of EPS, this study aimed to produce and characterize the native exopolysaccharide strain Leuconostoc pseudomesenteroides R2, which was isolated from cabbage collected in a semi-arid region of Bahia. We employed the following conditions for the production of EPS: 10.7% sucrose, pH 8.2, without agitation and incubation at 28°C for 30 hours. The fermentation broth was treated with ethanol and generated two types of polysaccharide substances (EPS I and EPS II). The identification of EPS I and EPS II was conducted using FT-IR, 1H, 13C and DEPT-135 NMR spectra. The two substances were identified as linear dextran ? polysaccharides (1 ? 6) which indicated different characteristics with respect to thermal analysis and density of free packaging, viscosity and time of solubilization. Both dextrans are of low density, possess high thermal stability and exhibited the behavior characteristic of pseudoplastic polymers.
Palavras-Chave: | Exopolysaccharide; Polymer.
Thesagro: | Bactéria.
Thesaurus Nal: | Biopolymers; dextran; Leuconostoc pseudomesenteroides.
Categoria do assunto: | S Ciências Biológicas
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/72397/1/2012AP52.pdf
Registro original: | Embrapa Meio Ambiente (CNPMA)
Exemplares: | CNPMA - (11663-1) - UPC - AP - DD -  -  -  - DIS