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A study of physical and chemical characteristics of pigments from Rhodopseudomonas viridis DSM133 was carried out for development of natural greenish colorant. Through visible absorption scanning, it showed three main absorption peaks at 378, 414 and 677 nm with three minor peaks at 510, 540 and 618nm, and it was shown to be greenish color. These pigments were more stabilized in alkaline solutions than in acid of between pH 6 and 9, and it was shown to be stabilized at the temperature below 40℃. In the presence of light and oxygen, the stability of pigments rapidly degraded, and it became unstable in the presence of metal ion such as Fe^(3+) and Al^(3+). But in the presence of Cu^(2+) were very stable. On the result of TLC analysis, pigments were shown to be composed of four color fractions and main color fractions were F-4 and F-2.
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