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Evaluation of plastic packages for guava refrigerated preservation

2001; Wiley; Volume: 14; Issue: 1 Linguagem: Inglês

10.1002/pts.522

1099-1522

Ângelo Pedro Jacomino, Ricardo Alfredo Kluge, Claire Isabel Grígoli de Luca Sarantópoulos, José Maria Monteiro Sigrist,

Nanocomposite Films for Food Packaging

Abstract Guavas cv. ‘Kumagai’ were packed in several plastic materials and stored at 10°C and 85–90% relative humidity (RH) for 7, 14, 21 and 28 days (+3 days at 25°C). The plastic materials studied were: multilayer co‐extruded polyolephine film with selective permeability (PSP), low‐density polyethylene film (LDPE), LDPE film with mineral incorporation (LDPEm) and heat‐shrinkable polyolephine film (SHR). Guavas not packed were taken as control samples. The physicochemical characteristics of the fruits, O 2 and CO 2 transmission rates of the packaging materials and gas composition at the package headspace were evaluated. The LDPE film, 69 µm in thickness, with the lowest permeability to both O 2 and CO 2 , led to anaerobiosis and high CO 2 concentration inside the packages and promoted physiological disturbances and changes in fruit flavour. The SHR film, 15 µm in thickness, was the most permeable to CO 2 and had quite high O 2 transmission, which modified the inner atmosphere of the packages slightly. The fruits packed in this film showed a poorer quality than the controls, possibly due to the heat produced during the shrinking of the film. The LDPEm film, 24 µm in thickness, was almost as permeable to CO 2 but had reduced O 2 transmission, promoting an atmosphere of equilibrium of 3% O 2 and 4.5% CO 2 . Fruits packed in this film kept their skin colour and pulp firmness, suitable for consumption up to 14 days. The PSP film, 35 µm in thickness, had the greatest O 2 transmission but just over half of the CO 2 transmission of LDPEm, promoting an atmosphere of equilibrium of 0.5% O 2 and 4.5% CO 2 inside the packages. Fruits packed in such packages kept their physicochemical characteristics up to 21 days. Copyright © 2001 John Wiley & Sons, Ltd.