Abstract
d-Galactose, d-mannose, d-xylose, l-arabinose, and d-glucuronic acid and its γ-lactone were examined as carbon sources for the culture of Aspergillus flavus. d-Mannose was taken up the most rapidly and d-glucuronic acid and its γ-lactone the least rapidly. A partially degraded polysaccharide from peach tree gum ( Prunus persica [ L.] Batsch containing the above sugars together with d-glucuronic acid and its 4- O-methyl ether was used as substrate for another A. flavus culture. It was found that d-galactose was the major sugar passing into the culture medium with lower proportions of d-xylose, l-arabinose, 2- O-β- d-glucopyranuronosyl- d-mannose, and 6- O-β- d-glucopyranuronosyl- d-galactose. This indicates that the fungus produces extracellular exo- and endo-glycanohydrolases which may be useful in structural studies on polysaccharides.
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