BIOCHEMISTRY OF THE USTILAGINALES: II. ISOLATION AND PARTIAL CHARACTERIZATION OF USTILAGIC ACID

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Abstract
The needle-like crystals which form in aerated submerged cultures of the corn smut Ustilago zeae (PRL-119) were found to be a D-glucolipid, m.p. 146-147[degree]C, [a]23D+7[degree] (pyridine), which contained 1 carboxyl group, 2 ester groups, at least 2 terminal methyl groups, and 2 D-glucose residues per mole. On the basis of elementary analyses, neutralization equivalent, and mol. wt. estimations, the molecular formula of the material isolated was approx. C37H62-66O17. The substance was not shown to be chemically homogeneous. Conditions used in culturing the fungus in stirred fermentors to produce the crystalline metabolic product, which was termed ''ustilagic acid,'' are described, and a procedure for the isolation of the material is given.
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