Direct Conversion of Agarose into Alkyl Mono- and Disaccharide Surfactants Based on 3,6-Anhydro L- and D-Galactose Units
Résumé
In this work, a new type of agaran-derived non-ionic surfactants has been prepared through the one-pot transformation of agarose into 3,6-anhydro L- and D-galactose acetal monomers and dimers possessing one or two alkyl chains according to the cyclic or open form of the L- and D-galactose units. The two steps process involves the butanolysis of agarose into butyl mono- and disaccharide 3,6-anhydro L- and D-galactose acetals promoted by the presence of Amberlyst-15Dry, followed by the transacetalization with n-dodecanol using the same acid catalyst. The chemical structures of the alkyl mono- and disaccharide surfactants were fully characterized by 1D and 2D NMR experiments. Surface activities of these products in a pure form or as mixtures were investigated depending on their hydrophilicity/hydrophobicity and quite low values of superficial tensions (andlt;27 mN m−1) and sunflower seed oil/water interfacial tensions (∼5 mN m−1) were obtained.
Domaines
Chimie
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Wang et al - 2021 - Direct Conversion of Agarose into Alkyl Mono-_Revised_manuscript.doc.pdf (1.19 Mo)
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Wang_slct202004542-sup-0001-misc_information.pdf (2.2 Mo)
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