Review Article
Colorful World of Microbes: Carotenoids and Their Applications
Table 3
Structure and characteristics of some common bacterial pigments.
| | Structure | Characteristic | Oxygen function |
|  | Bicyclic, orange | |
|  | Acyclic, red | |
|  | Tripyrrole, red | 2 methoxy,
2 bipyrrole rings |
|  | Purple-blue | 1 hydroxy group,
2 keto groups, and
3 bipyrrole ring |
|  | Bicyclic, yellow-orange | 2 hydroxy groups |
|  | Bicyclic, red | 2 hydroxy groups,
2 keto groups |
|  | Bicyclic, yellow | 2 hydroxy groups |
|  | Bicyclic, yellow | 2 hydroxy groups,
2 epoxy-groups |
|  | Bicyclic, yellow | 3 hydroxy groups,
1 epoxy group |
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