Abstract
Ten compounds (1~10) were successfully isolated from green algae Ulva prolifera through the combination of silica gel column chromatography, Sephadex LH-20 column chromatography and repeated preparative thin-layer chromatography. These ten compounds showed antialgal activity against red tide microalgae. Among them, compounds 3, 6, and 7 showed stronger antialgal activity against red tide microalgae. Furthermore, their structure was identified on the basis of spectroscopic data. There are three glycoglycerolipids: 1-O-octadecanoic acid-3-O-β-d-galactopyranosyl glycerol (2), 1-O-palmitoyl-3-O-β-d-galactopyranosyl glycerol (4), and 1-O-palmitoyl-2-O-oleoyl-3-O-β-d-galactopyranosyl glycerol (5); two monoglycerides: glycerol monopalmitate (1), 9-hexadecenoic acid, 2,3-dihydroxypropyl ester (3); two terpenoids: loliolide (6) and lsololiolide (7); one lipid-soluble pigments: zeaxanthin (8); one sterol: cholest-5-en-3-ol (9); and one alkaloid: pyrrolopiperazine-2,5-dione (10). These compounds were isolated from U. prolifera for the first time, and compounds 2, 3, 5, and 8 were isolated from marine macroalgae for the first time.
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Acknowledgments
The authors thank Prof. Bin-lunYan for his kind supply of U. prolifera, and Prof. Chang-hai Wang for his great help with the revision of the manuscript. This work was supported by the Natural Science Foundation of Jiangsu Province of China (BK20140446), a project funded by a Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and the Lianyungang Programs for Science and Technology Development (CG1310).
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Sun, Yy., Wang, H., Guo, Gl. et al. Isolation, purification, and identification of antialgal substances in green alga Ulva prolifera for antialgal activity against the common harmful red tide microalgae. Environ Sci Pollut Res 23, 1449–1459 (2016). https://doi.org/10.1007/s11356-015-5377-7
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DOI: https://doi.org/10.1007/s11356-015-5377-7