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
Affiliations
Sheyla Moreira Gonçalves
Department of Food Science and Technology, Rodovia 465 - Km 7, UFRRJ, Seropédica, RJ 23891-360, Brazil; Corresponding author.
Davy William Hidalgo Chávez
Department of Food Science and Technology, Rodovia 465 - Km 7, UFRRJ, Seropédica, RJ 23891-360, Brazil
Léa Mariza de Oliveira
Packaging Technology Center Cetea, Food Technology Institute Ital, Campinas, São Paulo, Brazil
Claire Isabel Grígoli de Luca Sarantópoulos
Packaging Technology Center Cetea, Food Technology Institute Ital, Campinas, São Paulo, Brazil
Carlos Wanderley Piler de Carvalho
Department of Food Science and Technology, Rodovia 465 - Km 7, UFRRJ, Seropédica, RJ 23891-360, Brazil; Embrapa Food Technology, Av. das Américas, 29501, Guaratiba, Rio de Janeiro, RJ 23020-470, Brazil
Nathália Ramos de Melo
Department of Food Science and Technology, Rodovia 465 - Km 7, UFRRJ, Seropédica, RJ 23891-360, Brazil; Department of Agribusiness Engineering, Av. dos Trabalhadores 420 - Vila Sta. Cecília, UFF, Volta Redonda, RJ 27255-125, Brazil
Amauri Rosenthal
Department of Food Science and Technology, Rodovia 465 - Km 7, UFRRJ, Seropédica, RJ 23891-360, Brazil; Embrapa Food Technology, Av. das Américas, 29501, Guaratiba, Rio de Janeiro, RJ 23020-470, Brazil
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.
