![]() Isolation from the hypobranchial glands of marine molluscs of 6-bromo-2,2-dimethylthioindolin-3-one and 6-bromo-2-methylthioindoleninone as alternative precursors to Tyrian purple. ![]() Tyrian purple: Ancient dye, a modern problem. This is the first report of the chemical ripening of eggs in a marine environment.īaker, J. The antimicrobial properties of these compounds and changes in their presence during egg development correlates with ripening in the egg masses of D. 6-Bromoisatin has mild antimicrobial properties, whereas Tyrian purple exhibited no significant activity. Tyriverdin did not appear to significantly lyse the microbial cells. Tyriverdin inhibits the growth of two marine pathogens, as well as the yeast Candida albicans at 0.001 mg/ml and was effectively bacteriostatic at 0.0005 mg/ml against three human pathogenic bacteria. Antimicrobial testing revealed that tyrindoleninone is toxic to both marine and human pathogens at a concentration of 1 mg/ml. The fresh egg masses contain a high proportion of tyrindoleninone, which reacts to form tyriverdin and subsequently Tyrian purple and 6-bromoisatin as the eggs develop and the larvae hatch. We report a putative defensive role for the precursors of Tyrian purple in the egg masses of the Australian muricid, Dicathais orbita.
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