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Abstract

A physiologically active novel substance designated as Mutastein is disclosed, which has the following specific physiological properties: (1) it has a molecular weight of at least 200,000, and when subjected to gel-filtration with Sephadex G-100 and Sephallose 6B, it will be eluted in the void volume; (2) its ultraviolet spectrum: FIG. 1; (3) its infrared spectrum: FIG. 2; (4) it has a proteinous nature and contains about 10% of saccharide; (5) it is soluble in water and a saline solution, but it will be salted out from a saturated solution containing about 30% of ammonium salfate; and it is insoluble in acetone, ethanol, ethylacetate and benzene, (6) it dissolves in a buffer solution having a pH 7 or over, but it precipitates at a pH of from 3 to 3.5, (7) it is stable when heat-treated at pH 9, at 100.degree. C. for 10 minutes, (8) its elementary analysis: C: about 44%, H: about 7%, and N: about 12%, (9) its color reactions: Phenol-surfuric acid color reaction (orange), and Folin's color reaction (blue). This substance can be prepared by culturing the Mutastein-producing strain belonging to the genus Aspergillus, and isolating the Mutastein from the culture medium.

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First Claim