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    Characterization of Active Edible Films based on Citral Essential Oil, Alginate and Pectin

    Year: 2018

    Journal: Materials, Volume 11, OCT

    Authors: Siracusa, Valentina; Romani, Santina; Gigli, Matteo; Mannozzi, Cinzia; Cecchini, Juan Pablo; Tylewicz, Urszula; Lotti, Nadia

    Organizations: Piano della Ricerca di Ateneo 2016-2018, University of Catania, Italy

    Keywords: edible film; alginate film; pectin film; essential oil; barrier properties; mechanical properties

    Thermal, structural and physico-chemical properties of different composite edible films based on alginate and pectin with the addition of citral essential oil (citral EO) as an agent to improve barrier properties, were investigated. The obtained films were clear and transparent, with a yellow hue that increased with citral EO addition. All the films displayed good thermal stability up to 160 degrees C, with a slight improvement observed by increasing the amount of citral EO in the composites. Gas transmission rate (GTR) strongly depended on the polymer structure, gas type and temperature, with improvement in barrier performance for composite samples. Also, citral EO did not exert any weakening action on the tensile behavior. On the contrary, an increase of the elastic modulus and of the tensile strength was observed. Lastly, water contact angle measurements demonstrated the dependence of the film wettability on the content of citral EO.
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