Unusual partially 3-O-methylated alpha-galactan from mushrooms of the genus Pleurotus |
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| Authors: | Carbonero Elaine R Gracher Ana Helena P Rosa Moira Caroline C Torri Giangiacomo Sassaki Guilherme L Gorin Philip Albert J Iacomini Marcello |
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| Institution: | Departamento de Bioquimica e Biologia Molecular, Universidade Federal do Paraná, CP 19.046, CEP81.531-980 Curitiba, PR, Brazil. |
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| Abstract: | Indistinguishable partially 3-O-methylated galactans were isolated from the edible basidiomycetes Pleurotus eryngii and Pleurotus ostreatoroseus. They were obtained via successive aqueous extraction, freeze-thawing, precipitation with Fehling solution of soluble material, and ultrafiltration. Mono- and bidimensional 13C and 1H-nuclear magnetic resonance spectroscopy (HMBC, HETEROTOCSY, COSY, and HMQC), and methylation analysis were used to determine their structures. They were linear, partially 3-O-methylated, (1-->6)-linked alpha-d-galactans containing Gal and 3-Me-Gal, in a 3:1 molar ratio (GC-MS of alditol acetates). |
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| Keywords: | Edible mushrooms Pleurotus eryngii Pleurotus ostreatoroseus O-Methylated galactan Chemical structure |
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