Effects of high hydrostatic pressure processing on structure and functional properties of biodegradable film

Sheyla Moreira Gonçalves; Davy William Hidalgo Chávez; Léa Mariza de Oliveira; Claire Isabel Grígoli de Luca Sarantópoulos; Carlos Wanderley Piler de Carvalho; Nathália Ramos de Melo; Amauri Rosenthal

doi:10.1016/j.heliyon.2020.e05213

Effects of high hydrostatic pressure processing on structure and functional properties of biodegradable film

Heliyon. 2020 Oct 10;6(10):e05213. doi: 10.1016/j.heliyon.2020.e05213. eCollection 2020 Oct.

Authors

Sheyla Moreira Gonçalves¹, Davy William Hidalgo Chávez¹, Léa Mariza de Oliveira², Claire Isabel Grígoli de Luca Sarantópoulos², Carlos Wanderley Piler de Carvalho^{1

3}, Nathália Ramos de Melo^{1

4}, Amauri Rosenthal^{1

3}

Affiliations

¹ Department of Food Science and Technology, Rodovia 465 - Km 7, UFRRJ, Seropédica, RJ 23891-360, Brazil.
² Packaging Technology Center Cetea, Food Technology Institute Ital, Campinas, São Paulo, Brazil.
³ Embrapa Food Technology, Av. das Américas, 29501, Guaratiba, Rio de Janeiro, RJ 23020-470, Brazil.
⁴ Department of Agribusiness Engineering, Av. dos Trabalhadores 420 - Vila Sta. Cecília, UFF, Volta Redonda, RJ 27255-125, Brazil.

Abstract

Effects of high hydrostatic pressure (HHP) processing (200-400 MPa/5 or 10 min) on functional properties of cellulose acetate (CA) films were investigated. As for mechanical properties, HHP caused a reduction in tensile strength (TS), Young's modulus (YM) and an increase in elongation at break (EB). The pressurized films were more luminous, yellowish, reddish and opaque. Less affinity for water was detected for pressurized films through analyses of contact angle and moisture absorption, in addition to reducing the water vapor transmission rate (WVTR). Scanning electron microscopy (SEM) showed the occurrence of delamination for most films, except those treated with 200 MPa/10 min and 300 MPa/10 min. All films showed a predominance of amorphous structure in X-ray diffraction analysis (XRD). That is alignment with the results of differential scanning calorimetry (DSC), which presented values for glass transition temperature (Tg), water adsorption and melting temperature characteristic of materials with low crystallinity. Films treated with HHP had better mechanical resistance during the sealing at 250 °C. In overall the results confirmed the minimal influence of HHP on the functional properties of the CA film and contributed to the scientific and technological knowledge for its potential application in foods processed by HHP.

Keywords: Cellulose acetate; Emerging technology; Food science; Heat seal strength; Materials science; Packaging materials; Physicochemical properties.