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1 results

  • Studies of new polysaccharides from lasallia pustulata (L.) Hoffm

  • M. T. Pereyra, A. Prieto, M. Bernabé, J. A. Leal
  • Journal:
    The Lichenologist / Volume 35 / Issue 2 / March 2003
    Published online by Cambridge University Press:
    28 March 2007, pp. 177-185
    Print publication:
    March 2003

  • Polysaccharides from thalli of Lasallia pustulata were extracted and characterized. The major fractions were characterized as pustulan, a β-glucan-chitin complex and a β-(1→3)-glucan. Other polysaccharides, which are minor components (less than 5%) solubilized with water from the alkali extracts of thalli, were shown to be galactomannans with a backbone of α-(l→6)- mannose partially substituted at positions 2 by galactofuranose and/or mannopyranose side chains of variable length. The relationship between these polysaccharides and those obtained by the same method from free-living fungi is discussed. The proportion or composition of the different polysaccharides studied was not affected by seasonal environmental conditions over a 2-year period.