Effect of composition and mechanoactivation on the properties of films based on starch and chitosans with high and low deacetylation

• Published in: Carbohydrate polymers Vol. 239; p. 116245
• Main Authors: Lipatova, I.M., Losev, N.V., Makarova, L.I., Rodicheva, J.A., Burmistrov, V.A.
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.07.2020
• Subjects: Chitosan; Edible films; Mechanoactivation; Microstructure; Starch; Вlends; Edible films; Вlends; Chitosan; Microstructure; Starch; Mechanoactivation
• ISSN: 0144-8617; 1879-1344
• DOI: 10.1016/j.carbpol.2020.116245

[Display omitted] •Shear stress is used to produce starch-chitosan films of improved quality.•Chitosans with high and low (LDC) deacetylation degree were used.•Аctivation increases flexibility, smoothness and transparency of films.•Mechanoactivation result in rise in films tensile strength of 1.5–2.5 time.•Shear-initiated gelation has been proved in blends with high LDC content. The effect of composition and mechanoactivation in the rotor-stator device on the rheological and film-forming properties of casting blends based on corn starch and chitosans with high (HDC) and low (LDC) deacetylation degree was studied. Films were characterized using optical and atomic force microscopy, X-ray diffraction, FTIR-spectroscopy and by tensile and moisture permeability testing data. An increase in chitosan content was found to result in the blends viscosity increase as well as the tensile strength, elongation and moisture permeability of films. Mechanoactivation was shown to cause an increase in the homogeneity, smoothness and transparency of the films, and an increase in the tensile strength by 1.5 and 2.5 times for the HDC and LDC based films, respectively. It is concluded that the developed eco-friendly and easily implemented method, which allows improving the unsatisfactory properties of starch-chitosan films without the introduction of additional chemicals, can be used on an industrial scale.