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The Physicochemical Stabilities and Biological Activities of Pigment Extracts from Pseudoalteromonas sp. Ju11-1 and Pseudoalteromonas sp. Ju14  

Park, Jin-Sook (Department of Biotechnology, Hannam University)
Cho, Hyun-Hee (Department of Biotechnology, Hannam University)
Kang, Myung-Hee (Department of Food and Nutrition, Hannam University)
Publication Information
Korean Journal of Microbiology / v.45, no.4, 2009 , pp. 404-410 More about this Journal
Abstract
We investigated the physicochemical stabilities and biological activities of ethanol- extracted pigment from marine bacteria Pseudoalteromonas sp. Ju11-1 and Pseudoalteromonas sp. Ju14. The bacterial pigment of strain Ju11-1 was very stable at pH 5.0 below $25^{\circ}C$. The stability of the pigment showed higher stability in the presence of metal ions such as $Cu^{2+}$ and $Mg^{2+}$. The pigment has activity of free-radical scavenging ($IC_{50}$ $95.2{\mu}g$/ml) and the protective antioxidant effect ($ED_{50}$ $82.3{\mu}g$/ml) against DNA damage in human lymphocytes. The bacterial pigment of strain Ju14 was very stable at pH range between 4.0 and 8.0 below $40^{\circ}C$. In the presence of light, the pigment was also very stable, showing more than 90 percent of remaining absorbance during 14 days at $25^{\circ}C$. The stability of the pigment, when metal ions were present, showed higher stability in all examined metal ions except for $Fe^{2+}$, $Al^{3+}$, and $Cu^{2+}$, especially in the presence of $Na^+$. The pigment has activity of freeradical scavenging ($IC_{50}$ $208.6{\mu}g$/ml) and the protective antioxidant effect ($ED_{50}$ $ 96.4{\mu}g$/m) against DNA damage in human lymphocytes. The result indicates that the bacterial pigments from marine bacteria, Pseudoalteromonas sp. Ju11-1 and Pseudoalteromonas sp. Ju14 showed higher physicochemical stability and significant effects for reduction in oxidative DNA damage. Therefore, the results suggest that these bacterial pigments could be used as a natural colorant having the advantages of antioxidant.
Keywords
bacterial pigment; comet assay; DPPH; marine bacteria; physicochemical stability; Pseudoalteromonas sp.;
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