Rheological Characterization of the Influence of Pomegranate Peel Extract Addition and Concentration in Chitosan and Gelatin Coatings

Polysaccharides

Ana Maria de Guzzi Plepis¹  Stanislau Bogusz Junior¹  Virginia da Conceição Amaro Martins¹  Mirella Romanelli Vicente Bertolo¹  Rafael Leme¹ 

[1] Sao Carlos Institute of Chemistry (IQSC), University of Sao Paulo (USP), Avenida do Trabalhador Sao Carlense, 400-Parque Arnold Schimidt, Sao Carlos 13566-590, SP, Brazil;

关键词: chitosan;    gelatin;    coatings;    pomegranate peel extract;    rheology;   

DOI  :  10.3390/polysaccharides2030039

来源: DOAJ

【 摘 要 】

In this study, the effects of an agro-industrial residue with active properties, pomegranate peel extract (PPE), were evaluated on the rheological properties of potential coatings based on chitosan (C) and gelatin (G). For this, rheological properties of the polymeric solutions were investigated in relation to PPE concentration (2 or 4 mg PPE g⁻¹ solution), and to its incorporation order into the system (in C or in CG mixture). All solutions were more viscous than elastic (G″ > G′), and the change in PPE concentration had a greater influence accentuating the viscous character of the samples in which PPE was added to the CG mixture (CGPPE2 and CGPPE4). PPE addition to the CG mixture increased the angular frequency at the moduli crossover, indicating the formation of a more resistant polymeric network. This tendency was also observed in flow results, in which PPE addition decreased the pseudoplastic behavior of the solutions, due to a greater cross-linking between the polymers and the phenolic compounds. In general, all the studied solutions showed viscosities suitable for the proposed application, and it was possible to state the importance of standardizing the addition order of the components during the preparation of a coating.

【 授权许可】

Unknown