期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 185, 期 -, 页码 679-687出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.06.180
关键词
Fucoidan; Regular polysaccharide; Nanoparticles; Chitosan
This study investigated the structure of two fucoidans from Fucus evanescens algae using NMR spectroscopy and examined the effects of fucoidan/chitosan mass ratio on the properties of nanoparticles. Molecular docking and thermodynamic analysis revealed significant conformational changes of the molecules during binding, potentially enhancing binding effectiveness.
Chitosan/fucoidan nanoparticles were created using two fucoidans from the Fucus evanescens algae. One of them was a regular fucoidan obtained for the first time from the alga harvested at the reproductive growth stage, using only standard extraction methods, without additional modifications. Its structure was established via NMR spectroscopy to consist of the repeating -> 3)-alpha-L-Fucp-(2,4SO(3)(-))-(1 -> 4)-alpha-L-Fucp-(2SO(3)(-))-(1 -> fragment. Such fragment also coustituted 55% of the other fucoidan's structure, however it also included long sequences of alpha-L-fucopyranose residues sulfated only at C2. The nanoparticles were re-dispersed in water and the influence of fucoidan/chitosan mass ratio on the nanoparticles' size and zeta potential was investigated. 3D models of the regular fucoidan and chitosan's sections were created and their molecular docking was performed, showing that either polymer could occupy the exterior of the complex, depending on their ratio. Thermodynamic parameters of fucoidan-chitosan binding process were accessed, with the results indicating that significant conformational changes of fucoidan and chitosan molecules take place during the interaction, presumably to allow for more effective binding.
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