Issue 12, 2021

Investigation of the influence of natural deep eutectic solvents (NaDES) in the properties of chitosan-stabilised films

Abstract

In the present work, the plasticising effect of the natural deep eutectic solvents (NaDESs) choline chloride/lactic acid and betaine/lactic acid in the formation of chitosan-stabilised films is investigated. The films were prepared by the casting technique, dissolving chitosan in 1% w/v solution of choline chloride and lactic acid or betaine and lactic acid in water, either as a pre-formed NaDES or as separately added components (physical mixture), without the addition of acetic acid. The physicochemical and mechanical properties of the formed films were studied. High concentration of the NADES (83%) increases the weight and thickness of the films. The reference chitosan films containing acetic acid or lactic acid are inelastic and very resistant to burst. On the other hand, the addition of betaine increases significantly the elongation capacity of the film prior to burst. The water vapour permeability of the films prepared from the NaDES solutions presents a 4.5 and a 2.6-fold increase, respectively, in comparison with acetic acid containing films. The materials prepared using the NaDESs have distinct differences to those prepared using the physical mixture of the NADESs’ components, as shown from the thermal and FT-IR spectroscopic analyses data. Finally, SEM imaging revealed differences among the surfaces of the films.

Graphical abstract: Investigation of the influence of natural deep eutectic solvents (NaDES) in the properties of chitosan-stabilised films

Supplementary files

Article information

Article type
Paper
Submitted
22 dec 2020
Accepted
08 maj 2021
First published
10 maj 2021
This article is Open Access
Creative Commons BY license

Mater. Adv., 2021,2, 3954-3964

Investigation of the influence of natural deep eutectic solvents (NaDES) in the properties of chitosan-stabilised films

A. R. N. Pontillo, S. Koutsoukos, T. Welton and A. Detsi, Mater. Adv., 2021, 2, 3954 DOI: 10.1039/D0MA01008A

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