TY - JOUR
T1 - Natural deep eutectic solvent of choline chloride with oxalic or ascorbic acids as efficient starch-based film plasticizers
AU - Sousa, Alex Sandro Bezerra de
AU - Lima, Renato Pereira
AU - Silva, Mariany Cruz Alves da
AU - Moreira, Dayse das Neves
AU - Pintado, Maria Manuela Estevez
AU - Silva, Silvanda de Melo
N1 - Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/10/27
Y1 - 2022/10/27
N2 - Natural deep eutectic solvents (NADES) of choline chloride/oxalic acid (OA) and choline chloride/ascorbic acid (AA) were evaluated as innovative candidates for cassava starch-based film plasticizers, aiming to replace the glycerol standard. NADES-OA and NADES-AA were compared at five levels with a 40% glycerol standard. NADES were characterized by Fourier Transform Infrared (FTIR), and the films were subjected to optical, physical, and mechanical evaluations and structural analysis by X-ray Diffractometry (XRD) and FTIR. NADES-OA and NADES-AA improved the films' optical, physical, and mechanical properties, providing characteristics similar or superior to those plasticized with glycerol. NADES-OA showed a greater plasticizing effect, requiring a lower plasticizer concentration (30%) for the films to reach similar mechanical and physical characteristics to those with 40% glycerol. In addition, it presented a lower opacity and crystallinity index. Films with 60% NADES-AA had the highest elasticity and the lowest opacity but were highly water soluble and slightly yellow. Novel data reported here indicate that NADES-OA and NADES-AA can be used as efficient plasticizers for starch-based films, presenting vast potential for use as films or coatings for the agricultural and food industries.
AB - Natural deep eutectic solvents (NADES) of choline chloride/oxalic acid (OA) and choline chloride/ascorbic acid (AA) were evaluated as innovative candidates for cassava starch-based film plasticizers, aiming to replace the glycerol standard. NADES-OA and NADES-AA were compared at five levels with a 40% glycerol standard. NADES were characterized by Fourier Transform Infrared (FTIR), and the films were subjected to optical, physical, and mechanical evaluations and structural analysis by X-ray Diffractometry (XRD) and FTIR. NADES-OA and NADES-AA improved the films' optical, physical, and mechanical properties, providing characteristics similar or superior to those plasticized with glycerol. NADES-OA showed a greater plasticizing effect, requiring a lower plasticizer concentration (30%) for the films to reach similar mechanical and physical characteristics to those with 40% glycerol. In addition, it presented a lower opacity and crystallinity index. Films with 60% NADES-AA had the highest elasticity and the lowest opacity but were highly water soluble and slightly yellow. Novel data reported here indicate that NADES-OA and NADES-AA can be used as efficient plasticizers for starch-based films, presenting vast potential for use as films or coatings for the agricultural and food industries.
KW - Ascorbic acid
KW - Cassava starch
KW - Mechanical properties
KW - NADES
KW - Oxalic acid
UR - http://www.scopus.com/inward/record.url?scp=85138464455&partnerID=8YFLogxK
U2 - 10.1016/j.polymer.2022.125314
DO - 10.1016/j.polymer.2022.125314
M3 - Article
AN - SCOPUS:85138464455
SN - 0032-3861
VL - 259
JO - Polymer
JF - Polymer
M1 - 125314
ER -
