Synthesis and characterization of cassava starch with maleic acid derivatives by etherification reaction

• Published in: Carbohydrate polymers Vol. 180; pp. 348 - 353
• Main Authors: Clasen, Samuel H., Müller, Carmen M.O., Parize, Alexandre L., Pires, Alfredo T.N.
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 15.01.2018
• Subjects: Bioactive packaging; Biodegradable packaging; Etherification; Starch modification; Biodegradable packaging; Bioactive packaging; Starch modification; Etherification
• ISSN: 0144-8617; 1879-1344
• DOI: 10.1016/j.carbpol.2017.10.016

•Etherification reaction of cassava starch.•Modification of the starch fobicity.•Determination of the degree of substitution from 1H NMR analyses.•Potential of modified starch for use in bioactive packaging.•Potential of modified starch for use as encapsulation medium. Cassava starch was grafted with three different esters by the etherification reaction and its modification was characterized by 1H NMR, FTIR, DSC, SEM, XDR, contact angle and SLS. The samples grafted with diethyl maleate, dipropyl maleate, and dibutyl maleate showed DS values of 2.3, 1.0 and 2.0, respectively, determined from 1H NMR analysis and confirmed by FTIR analysis, with the appearance of bands at 1721, 1550 and 1126cm−1. The FTIR, XRD, SEM and DSC results indicated a change in the intra and intermolecular hydrogen interactions in the grafted starch when compared to native starch. Based on the contact angles, it was observed that the macromolecular starch chain acquired hydrophobic characteristics through the substitution of the hydrogens with di maleate esters. The characteristics acquired by grafted starch allow it to be used for the encapsulation of bioactive molecules for the production of bioactive packages and the production of biodegradable packages.