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. 2021 Jan 23;13(2):251–259. doi: 10.1186/BF03548579

The Production and Some Properties of the Brown Pigment of Aeromonas Liquefaciens

Produksjon og noen egenskaper hos det brune pigment fra Aeromonas liquefaciens

Kjell Aurstad 112,212,✉, Hans Kolbein Dahle 112
PMCID: PMC8561566  PMID: 4631519

Abstract

The optimum conditions for pigment production by Ae. liquefaciens was found to be 30 °C and aerobic incubation, and the properties of the pigment are shown to be similar to those of the synthetic dopa-melanin referred to. The enzyme phenol oxidase was demonstrated in the culture filtrates, but not in extracts of disintegrated cells. As precursors for the pigment production, which was shown to be strictly pH dependent, DL-tyrosine, DL-dopa and catechol were used with success, while numerous other amino acids failed. The significance of the pigment as a criterium for the identification of strains which are pathogenic to certain animals or fishes, is not known.

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