Partially methylated galactans containing different proportions of 3-O-methyl-galactose from Pleurotus citrinopileatus

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Brito, Dayane R.
Carbonero, Elaine R.
Viana, Sthefany R. F. [UNESP]
Silva, Estefania V.
Ruthes, Andrea Caroline
Liao, Luciano M.
Iacomini, Marcello

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Elsevier B.V.


Pleurotus citrinopileatus, popularly known as golden oyster mushroom have medicinal properties, which are attributed mainly to the presence of bioactive polysaccharides. In this work, two partially 3-O-methylated galactans were isolated from the fruiting bodies of this fungus, via successive aqueous extraction, followed by fractionation by freeze-thawing, and precipitation of soluble material with Fehling solution. The structural assignments were carried out using mono-and bidimensional NMR spectroscopy, monosaccharide composition, and methylation analyses. The polysaccharides were characterized as linear, partially 3-O-methylated (1 -> 6)-linked alpha-galactopyranans, containing only Gal and 3-O-Me-Gal, in 2:1 and 1:1 molar ratios, with molar masses of 37.6 x 10(3) g/mol and 28.5 x 10(3) g/mol, respectively. Similar structures have been described for other Pleurotus spp., but showing a lower content of 3-O-Me-Gal. (c) 2018 Elsevier Ltd. All rights reserved.



Medicinal mushroom, Pleurotus citrinopileatus, O-methylated galactans, Chemical structure

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Carbohydrate Research. Oxford: Elsevier Sci Ltd, v. 458, p. 29-34, 2018.