Bioactive Compounds Isolated from Defatted Microalgal Biomasses of Botryococcus Braunii and Dunaliella Tertiolecta showing a Tyrosinase Inhibitory Activity

Aims: This study aims to elucidate the structural difference and biochemical properties of bioactive compounds of microalgal biomasses. Background : The structural difference and biochemical properties of bioactive compounds termed as water-soluble macromolecules (WSMs) are interested in evaluating their biological activities. Methods: This study was performed to elucidate the structural difference and biochemical properties of bioactive compounds termed as water-soluble macromolecules (WSMs) isolated from defatted microalgal biomasses of Botryococcus braunii and Dunaliella tertiolecta. Results: The compositional analysis of both WSMs revealed that WSM-Bb is a hetero-macromolecule consisting of various monosaccharides, whereas WSM-Dt was characterized as a homo-macromolecule that mainly consists of glucose. Interestingly, WSM-Bb showed the significant tyrosinase inhibitory activity with the increase of both the concentration and reaction time. Whereas, there was no significant inhibitory activity observed by WSM-Dt. Conclusion: Inhibitory action of WSM-Bb toward both tyrosinase and tyrosine in the either simultaneous or separate reaction may be mainly due to the physical affinity of WSM-Bb. These results emphasize the identification of the primary components of these WSMs and their relevance with the antioxidant function.