Galactomannans with novel structures from the lichen Roccella decipiens Darb
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Updated: Aug 17, 2026

Structural Characterization of Mannan Cell Wall Polysaccharides in Plants Using PACE
Published on: October 16, 2017
Elaine R Carbonero1, Lucimara M C Cordeiro, Caroline G Mellinger
1Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Paraná, UFPR, CP 19.046, CEP 81.531-990 Curitiba, PR, Brazil.
Abstract:
Two homogeneous galactomannan fractions were isolated from the lichen, Roccella decipiens, one (FP) containing Man and Gal in an 81:19 molar ratio and the other (RFS), having Man, Gal, and Glc in a 43:56:1 molar ratio. FP consisted of a main chain with (1-->4)-linked alpha-D-Manp units, most of which were substituted at O-2 with side chains consisting of nonreducing end-, 2-O- and 6-O-substituted alpha-Manp units. The latter appeared to be substituted by single-unit beta-D-Galf nonreducing ends. RFS contained a similar alpha-D-Manp core structure, but with side chains containing nonreducing end, 5-O-, 6-O-, and 5,6-di-O-substituted beta-D-Galf units. Such polysaccharide structures have not been previously reported.
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