극지 미세조류의 세포외 다당 분비 및 특성

Abstract

Arctic sea ice algae are known to produce essential proteins to prevent freezing in the ice to survive. However, research on sea ice algae extracellular polysaccharides (EPS) is lagging behind. Microalgae have been reported to be about 30,000 species currently exist in the world. The polar region is an area where the environment change can happen rapidly. As a result, structural change of sea ice will affect the ecosystem, thereby causing a large ripple effect. Therefore, reduction of the ice according to the global warming has become a very big issue. However, research on EPS, which is secreted by sea ice algae is currently very limited. So I analyzed the production of EPS due to changes in the environment (temperacture and salinity) and the characteristic of secreted EPS. As a result, microalgae EPS is abundant of fucose, rhamnose, xylose and the degree of sulfation is 40%, so that is sulfuric acid fucan. Analyzing spectroscopic characteristics of the EPS using a FT- IR, NMR showed similar results to the chemical analysis of the EPS. Further sea ice micro algae EPS has few or no ice recrystallization inhibition activity. Also this study showed that the EPS’s antibacterial activity is very high. EPS produced by algae and bacteria are considered different. Therefore, If the experiment is proceeding more, it clarifies the detailed structure of each of the EPS and perform research on various physiological activities, that provide an important basis for identifying the role of EPS in sea ice.