Nanostructured starch combined with hydroxytyrosol in poly(vinyl alcohol) based ternary films as active packaging system

Francesca Luzi; Elena Fortunati; Alessandro Di Michele; Elisa Pannucci; Ermelinda Botticella; Luca Santi; José Maria Kenny; Luigi Torre; Roberta Bernini

doi:10.1016/j.carbpol.2018.03.079

Nanostructured starch combined with hydroxytyrosol in poly(vinyl alcohol) based ternary films as active packaging system

Carbohydr Polym. 2018 Aug 1:193:239-248. doi: 10.1016/j.carbpol.2018.03.079. Epub 2018 Mar 26.

Authors

Francesca Luzi¹, Elena Fortunati¹, Alessandro Di Michele², Elisa Pannucci³, Ermelinda Botticella³, Luca Santi³, José Maria Kenny¹, Luigi Torre⁴, Roberta Bernini³

Affiliations

¹ University of Perugia, Civil and Environmental Engineering Department, Strada di Pentima 4, 05100 Terni, Italy.
² University of Perugia, Physic and Geology Department, Via Pascoli, 06123 Perugia, Italy.
³ University of Tuscia, Department of Agricultural and Forestry Sciences (DAFNE), Via S. Camillo De Lellis, 01100 Viterbo, Italy.
⁴ University of Perugia, Civil and Environmental Engineering Department, Strada di Pentima 4, 05100 Terni, Italy. Electronic address: luigi.torre@unipg.it.

PMID: 29773378
DOI: 10.1016/j.carbpol.2018.03.079

Abstract

Novel ternary films have been realized by using poly(vinyl alcohol) (PVA) as polymeric matrix, nanostructured starch as reinforcement phase and hydroxytyrosol (HTyr), a low-molecular phenolic compound present in olive oil, as antioxidant agent. Nanostructured starch, in the form of starch nanocrystals (NC) and nanoparticles (NP) obtained by acid hydrolysis and ultrasound irradiation of starch derived from the bread wheat variety Cadenza (WT, amylose content 33%) and a derived-high amylose line (HA, amylose content 75%), was considered. The developed multifunctional films were characterized in terms of morphological, thermal and optical properties, water absorption capacity, overall and specific migration into a food simulant and antioxidant properties. Experimental data showed a prolonged release of HTyr from all ternary films and the released HTyr retained a strong antioxidant activity. The data, compared to those of PVA/HTyr binary films, demonstrated the key role of nanostructured starch in the ternary formulations in promoting a gradual release of HTyr. Overall, PVA fillm combined with nanoparticles from low amylose starch and hydroxytyrosol resulted as the most promising ternary formulation for food packaging applications.

Keywords: Antioxidant properties; Hydroxytyrosol; Poly(vinyl alcohol) (PVA); Prolonged release; Starch nanocrystals; Starch nanoparticles.