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In this study, biodegradable films were formulated in a combination of four different cellulose derivatives (2-hydroxyethyl cellulose with 2 different molecular mass – 720,000 and 1300,000 g/mol, carboxymethyl cellulose, and hydroxypropyl methylcellulose), different concentration of commercial citrus pectin (10 and 20 %), and glycerol. Optical, mechanical, and barrier properties, thermogravimetric parameters, FT-IR analysis, and surface morphology of the films were investigated. The results demonstrated that the addition of 10 % pectin to the formulation of the films increased transparency and tensile strength, while values for oxygen and water vapor permeability decreased. In addition, the uniformization of the blend components was observed by study of surface morphology. Moreover, the characteristic functional groups and interactions between polymers (cellulose derivatives and pectin) and glycerol were highlighted by FT-IR analysis. Films formulated with 10 % of pectin have a great potential to be used for food packaging in which good barrier properties are required.
Ursachi et al. (Tue,) studied this question.