Abstract
Seven new strains of Monascus purpureus Went were induced by neutron and x-ray irradiation. The quantity and quality of pigments produced by these strains differed. Strains N4S and N11S produced twice as much pigment as normal, while another strain, N14S, was albino. An unknown orange pigment was found in young colonies of the N11S strain. This orange pigment reacted with alcohols and malt extract medium to form red pigments. Strains N4S, N11S, X2P, and wild type inhibited the growth of certain bacteria, especially the Bacillus species. Strain N11S had more antibacterial activity than wild type. A major active compound was isolated with an ultraviolet absorption spectrum that was related to those of the red pigments found in this fungus. The active compound(s) was named monascidin.
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