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Names | |
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Systematic IUPAC name (5E)-3-amino-5-(5-amino-2,6-dioxopyridin-3-ylidene)pyridine-2,6-dione | |
Identifiers | |
3D model (JSmol) | |
ChEBI | |
ChemSpider | |
PubChem CID | |
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Properties | |
C10H8N4O4 | |
Molar mass | 248,19 g·mol −1 |
Appearance | blue powder [1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
Indigoidine is an organic compound of the azaquinone group. It is a blue pigment produced by some bacterial species that excrete it into the surrounding medium.
Otto Voges researched and described the bacterial species Bacillus indigoferus in 1893, renamed after him to Vogesella indigofera , in Kiel, which continuously discolored the surrounding medium (water) from slightly bluish (24 hours) to royal blue (48 hours).
In 1964 and 1965, Nobel laureate Richard Kuhn and his colleagues published several articles in the scientific press on the occurrence, structure and synthesis of indigoidine. [2] [3] [4]
In 1979, Carl-Gerd Dieris and H.-D. Scharf described another synthesis of the compound. [5]
Indigoidine occurs in the following species of bacteria:
Indigoidine can be synthesized from citrazinic Acid (C6H5NO4), which is itself produced from citric acid and ammonia.
The biosynthesis of indigoidine starts from glutamine, which is enzymatically oxidized, cyclized to the heterocycle and dimerized. [6]
The names for the segments A, Ox, A, T and Te refer to defined domains within the enzyme structure of the bpsA gene product BPSA. [7]
Indigoidine is a blue amorphous powder that is insoluble in water and most other solvents, but dissolves in hydrochloric acid, producing a royal blue color, and in hot sulfuric acid, producing an orange-brown color. [8]
The color of indigoidine is attributed to an indigoid chromophore. NMR spectroscopic studies of derivatives confirmed the stated symmetrical structure. Because of the nitrogen atoms in the quinoid rings, indigoidine is classified as azaquinones.
A derivative is the violet pigment N5,N5′-Didodecylindigoidine, (C34H56N4O4), which was isolated from the psychrophile bacteria Shewanella violacea DSS12. [9]