2014-11-202022-04-262022-04-262013-07-18OLIVEIRA, Gracy Kelly Faria. Elucidação estrutural de heterogalactanas parcialmente metiladas obtidas de Grifola frondosa (“Maitake”) e Pleurotus ostreatus (“Shimeji”). 2013. 75 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Catalão, 2013.http://repositorio.ufcat.edu.br/tede/handle/tede/3660Partially methylated heterogalactans were isolated from the fruiting bodies of the medicinal mushroom Pleurotus ostreatus (mannogalactan) and Grifola frondosa (mannofucogalactan), via successive cold aqueous extraction, followed by fractionation through freeze-thawing, precipitation with Fehling solution of soluble material, and dialysis using membranes with different exclusion limits (MWCO 50, 100, and 500 kDa). Their chemical structures were established based on monosaccharide composition, methylation analysis and NMR studies. The mannogalactan (Mw = 50.7 x 103 g.mol-1) had a main chain of (1→6)-linked α-D-galactopyranosyl and 3-O-methyl-α-D-galactopyranosyl units, both of which are partially substituted at O-2 by -D-mannopyranosyl nonreducing ends.The other was a mannofucogalactan (Mw = 15.9 x 103 g.mol-1), which had a similar main-chain, being a part of the galactopyranosyl units substituted at O-2 mainly by 3-O-α-D-mannopyranosyl-α-L-fucopyranosyl groups and in a minor proportion with α-L-Fucp single-unit side chains. Recently, the heterogalactans are also recognized for their relevant biological activities, such as antitumor, immunomodulatory, anti-inflammatory and antinociceptive effects. Thus, the heterogalactans obtained from G.frondosa and P. ostreatus could present itself as a good candidate to be evaluated for its biological potential.application/pdfAcesso AbertoCogumelos medicinaisGrifola frondosaPleurotus ostreatusHeterogalactanaEstrutura químicaMedicinal mushroomsGrifola frondosaPleurotus ostreatus;HeterogalactansChemical structureQUIMICA ORGANICA::QUIMICA DOS PRODUTOS NATURAISDissertação