Correlation between the Difference in Chemical Composition and Antioxidant Activity of Water Soluble Compounds derived from Marine Photosynthetic Microalgae

Abstract

The aim of this study is to elucidate the relationship between the chemical composition and antioxidant activity of water soluble compounds derived from the degradation of microalgal biomass. Since some of particular species of microalgae are promising source for biofuel production, a vast amount of wastes after extracting lipids are treated as trash. To address the potent utilization as a bio-resource, water soluble compounds (WSC) were isolated by the enzymatic and chemical degradation of microalgal biomasses. To test biological activities of WSC, antioxidant activity was determined by DPPH, ABTS, and FRAP based on free radical-scavenging assay. As the result, we found that WSC obtained after enzymatic or chemical treatments have been shown difference in chemical composition and relative antioxidant activities. Although WSC has shown the less significant antioxidant activities, our data suggest that technical development for the extraction and utilization of WSC from microalga are very important to make a good understanding the correlation between the chemical compositions and biological activity.