Nurbani, S.Z., Sumandiarsa, I.K., Hidayah, L.N. and Siregar, R.Y. 2023. Alginate Characteristics and Fucoxanthin Content from Sargassum polycystum Through Ultrasound-Assisted Extraction and the Relationship with Water Quality of Habitat. Polish Journal of Natural Sciences. 37, 4 (Jun. 2023). DOI:https://doi.org/10.31648/pjns.7715.