Abstract

해양세균 Pseudoalteromonas psicida TA20의 ethanol 색소 추출물에 대한 안정성과 기능성을 검토한 결과, 본 해양세균 색소는 pH 4.0에서 pH 8.0의 조건과 <TEX>$40^{\circ}C$</TEX> 이하에서 매우 안정하였으며, <TEX>$25^{\circ}C$</TEX> 14일간 90% 이상의 잔존율을 나타내어 빛에 대한 안정성이 매우 우수한 것으로 나타났다. 금속이온의 경우 <TEX>$Al^{3+}$</TEX>과 <TEX>$Cu^{2+}$</TEX>를 제외한 실험된 모든 금속이온에 대하여 매우 안정하였으며 특히, 다른 색소추출물들에 비해 <TEX>$Fe^{2+}$</TEX>에 대한 안정성이 높은 것으로 나타났다. 해양세균 색소추출물에 대한 생리활성 실험 결과, free radical 소거 활성 (3495 <TEX>${\mu}g/ml$</TEX>)이 나타났으며, 색소농도 10 <TEX>${\mu}g/ml$</TEX>일 때 44%의 인체세포 DNA 손상 회복능이 있음을 보여 항산화능이 우수함을 알 수 있었다. 또한 주요 식품유해세균에 대하여 항균활성을 나타내었다. 따라서 본 해양세균 색소는 항산화능과 항균활성을 갖는 식품 색소로의 적용을 검토할 수 있을 것으로 기대된다. We investigated the physicochemical stabilities and biological activities of ethanol- extracted pigment from marine bacterium Pseudoalteromonas psicida TA20. This bacterial pigment was very stable at a pH range of between 4.0 and 8.0 at a temperature below <TEX>$40^{\circ}C$</TEX>. In the presence of light, the pigment was also very stable, showing more than 90 percent remaining absorbance during 14 days at <TEX>$25^{\circ}C$</TEX>. The stability of the pigment, when metal ions were present, showed higher stability in all examined metal ions except for <TEX>$Al^{3+}$</TEX> and <TEX>$Cu^{2+}$</TEX>, especially in the presence of <TEX>$Fe^{2+}$</TEX>. This pigment showed higher stability than other pigment extracts reported. The pigment has free-radical scavenging (3,495 <TEX>${\mu}g/ml$</TEX>) activity and 44% antioxidant protective effect against DNA damage of human lymphocyte cells at a concentration of 10 <TEX>${\mu}g/ml$</TEX>. The results indicate that the bacterial pigment produced a significant reduction in oxidative DNA damage. The pigment also showed antimicrobial activity against major food poisoning bacteria. Therefore, these results suggest that this bacterial pigment could be used as a natural colorant in the food industry, having the advantages of antioxidant and antimicrobial activities.

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