A glucuronoarabinoxylan (CNAL) was extracted with 1% aq. KOH (25°C) from Cocos nucifera gum exudate. It had a homogeneous profile on HPSEC-MALLS-RI (Mw 4.6 × 10(4)g/mol) and was composed of Fuc, Ara, Xyl, GlcpA (and 4-O-GlcpA) in a 7:28:62:3 molar ratio. Methylation data showed a branched structure with 39% of non-reducing end units, 3-O-substituted Araf (8%), 3,4-di-O- (15%), 2,4-di-O- (5%) and 2,3,4-tri-O-substituted Xylp units (17%). The anomeric region of CNAL (13)C NMR spectrum contained 9 signals, indicating a complex structure. The main chain of CNAL was characterized by analysis of a Smith-degraded polysaccharide. Its (13)C NMR spectrum showed 5 main signals at δ 101.6, δ 75.5, δ 73.9, δ 72.5, and δ 63.1 that were attributed to C-1, C-4, C-3, C-2 and C-5 of (1→4)-linked β-Xylp-main chain units, respectively. CNAL exhibited gastroprotective effect, by reducing gastric hemorrhagic lesions, when orally administered (1 and 3mg/kg) to rats prior to ethanol administration.
Na última década, especial atenção tem sido dada à presença de compostos farmacêuticos no ambiente aquático; uma vez que o aporte contínuo e a persistência de várias dessas substâncias podem trazer danos irreversíveis à biota. Sendo assim, o desenvolvimento e aplicação de novas tecnologias de tratamento que permitam a remoção ou diminuição desses contaminantes tem sido objeto de interesse na área de saneamento ambiental. Entretanto, a não existência de programas específicos de monitoramento nas ETEs, impossibilita a avaliação do comportamento dos fármacos nas plantas instaladas. O presente trabalho ilustra os principais fatores envolvidos no aporte desses contaminantes e apresenta um alerta do caminho a ser percorrido, na implementação de sistemas de tratamento adequados para minimizar a deterioração dos ecossistemas aquáticos.Palavras-chave: ambiente aquático; contaminação; tratamento de água.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.