Natural deep eutectic solvents (NADESs) represent an environmentally friendly replacement for petroleum-based solvents; for this reason, they are a major field of research which aims to reduce the industrial emissions, looking forward to greener processes. Besides, beta cyclodextrin (βCD)-based polymers are a class of materials widely exploited for the controlled release of drugs and the adsorption of undesired substances in many pharma, food, and environmental applications. However, most syntheses of βCD-based polymers require the use of organic solvents or toxic reactants; hence, describing a green way to obtain such a class of materials would make the process more sustainable and suitable for eco-friendly scaling-up. In this work, the synthesis of water-soluble βCD-based polymers characterized by molecular weight ranging from 15 kDa to 19 kDa has been reported, using 1 : 1, 1 : 1.5, and 1 : 2 mol : mol choline chloride/citric acid NADESs as a solvent. The peculiar structure displayed by the resulting polymer allowed the latter to be cured into a βCD-based nanosponge, turning its structure from a water-soluble to cross-linked one. Eventually, the obtained βCD-based nanosponges displayed positive ζ-potential values ranging up to +20 mV, related to the presence of quaternary ammonium functions. This positive charge obtained was dependent on the choline chloride/citric acid molar ratio chosen for the NADES preparation, and further confirmed by adsorption and release studies with charged probe molecules.

Sustainable synthesis of cyclodextrin-based polymers by exploiting natural deep eutectic solvents

Cecone C.
;
Hoti G.;Appleton S. L.;Caldera F.;Bracco P.;Zanetti M.;Trotta F.
2020

Abstract

Natural deep eutectic solvents (NADESs) represent an environmentally friendly replacement for petroleum-based solvents; for this reason, they are a major field of research which aims to reduce the industrial emissions, looking forward to greener processes. Besides, beta cyclodextrin (βCD)-based polymers are a class of materials widely exploited for the controlled release of drugs and the adsorption of undesired substances in many pharma, food, and environmental applications. However, most syntheses of βCD-based polymers require the use of organic solvents or toxic reactants; hence, describing a green way to obtain such a class of materials would make the process more sustainable and suitable for eco-friendly scaling-up. In this work, the synthesis of water-soluble βCD-based polymers characterized by molecular weight ranging from 15 kDa to 19 kDa has been reported, using 1 : 1, 1 : 1.5, and 1 : 2 mol : mol choline chloride/citric acid NADESs as a solvent. The peculiar structure displayed by the resulting polymer allowed the latter to be cured into a βCD-based nanosponge, turning its structure from a water-soluble to cross-linked one. Eventually, the obtained βCD-based nanosponges displayed positive ζ-potential values ranging up to +20 mV, related to the presence of quaternary ammonium functions. This positive charge obtained was dependent on the choline chloride/citric acid molar ratio chosen for the NADES preparation, and further confirmed by adsorption and release studies with charged probe molecules.
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https://doi.org/10.1039/D0GC02247K
Cecone C.; Hoti G.; Krabicova I.; Appleton S.L.; Caldera F.; Bracco P.; Zanetti M.; Trotta F.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/1757257
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