Abstract
The structure of sulfated polysaccharides extracted from green seaweed Ulva lactuca has been determined using NMR experiments. The obtained results indicate that this natural product is mainly composed of disaccharide A3S: [→4)-β-d-GlcA-(1 → 4)-α-l-Rha3S-(1→] and B3S: [→4)-α-l-IdoA-(1 → 4)-α-l-Rha3S-(1→]. The computational calculations using density functional theory (DFT) at the B3LYP/6–311+G(2d,p)//B3LYP/6–311G(d,p) model chemistries were also investigated to analyze the obtained structures based on the comparison of 1H and 13C NMR chemical shifts. The DFT results also confirm that the A3S structure is more dominating than the B3S one with the mean absolute error of 1H and 13C NMR chemical shifts, respectively, equal to 0.46 and 4.98 ppm for the A3S and to 2.07 and 5.03 ppm for the B3S.
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This research is funded by Vietnam Academy of Science and Technology (Project number VAST03.04/15-16).
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Tran, T.T.V., Huy, B.T., Truong, H.B. et al. Structure analysis of sulfated polysaccharides extracted from green seaweed Ulva lactuca: experimental and density functional theory studies. Monatsh Chem 149, 197–205 (2018). https://doi.org/10.1007/s00706-017-2056-z
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DOI: https://doi.org/10.1007/s00706-017-2056-z