Optimized pH-responsive film based on a eutectic mixture-plasticized chitosan

Pamela F Pereira; Cristina T Andrade

doi:10.1016/j.carbpol.2017.02.047

Optimized pH-responsive film based on a eutectic mixture-plasticized chitosan

Carbohydr Polym. 2017 Jun 1:165:238-246. doi: 10.1016/j.carbpol.2017.02.047. Epub 2017 Feb 16.

Authors

Pamela F Pereira¹, Cristina T Andrade²

Affiliations

¹ Programa de Pós-Graduação em Ciência de Alimentos, Instituto de Química, Universidade Federal do Rio de Janeiro, Avenida Athos da Silveira Ramos 149, 21941-909 Rio de Janeiro, RJ, Brazil.
² Programa de Pós-Graduação em Ciência de Alimentos, Instituto de Química, Universidade Federal do Rio de Janeiro, Avenida Athos da Silveira Ramos 149, 21941-909 Rio de Janeiro, RJ, Brazil; Instituto de Macromoléculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro, Avenida Horácio Macedo 2030, 21941-598 Rio de Janeiro, RJ, Brazil. Electronic address: ctandrade@ima.ufrj.br.

PMID: 28363546
DOI: 10.1016/j.carbpol.2017.02.047

Abstract

Chitosan (CS, 2g/100mL)/curcumin 1g/100mL in acetic acid aqueous solution were used to prepare films to be used as food indicator. Microcrystalline cellulose (MCC) and a eutectic mixture (DES) were incorporated as reinforcing and plasticizing agents, respectively. The MCC content (133 mas%) and DES composition (7.93 mass%), based on CS dry mass, were optimized. The properties of the DES-plasticized film were compared to those for the unplasticized and glycerol (G)-plasticized CS films. The DES-plasticized film presented initial temperature of thermal decomposition at 267.7°C, dynamic glass transition at 149.3°C, water vapor permeability of 7.21×10^-10gs^-1m^-1Pa^-1, water solubility of 3.07% and stress at break of 20.1MPa. The incorporation of MCC contributed to increase the crystallinity of the composite films. Colorimetric tests, carried out in aqueous environments for the DES-plasticized film, revealed accentuated color changes, mainly at pHs higher than pH 8.

Keywords: Chitosan; Chitosan (PubChem CID: 71853); Choline chloride (PubChem CID: 6209); Curcumin; Curcumin (PubChem CID: 969516); Eutectic mixture; Glycerol (PubChem CID: 753); Intelligent packaging; Microcrystalline cellulose; Microcrystalline cellulose (PubChem CID: 62698).