Mass Transfer and Optical Properties of Active PET/PP Food-Grade Films Impregnated with Olive Leaf Extract

Abstract

A supercritical solvent impregnation (SSI) technique was employed to incorporate, by batch- and semicontinuous-modes, bioactive olive leaf extract (OLE) into a food-grade multilayer polyethylene terephthalate/polypropylene (PET/PP) film for active food packaging applications. The inclusion of OLE in the polymer surfaces significantly modified the colour properties of the film. A correlation of 87.06% between the CIELAB colour parameters and the amount of the OLE impregnated in the film was obtained which suggests that colour determination can be used as a rapid, non-destructive technique to estimate the OLE loading in the impregnated matrices. The UV barrier and water permeability properties of the films were not significantly modified by the incorporation of OLE. The migration of OLE into a 50% (v/v) ethanol food simulant demonstrated faster release of OLE from the PP surface than from the PET surface which may be due to the different interactions between OLE and each polymer.

Characterization of Synthetic Polymer Coated with Biopolymer Layer with Natural Orange Peel Extract Aimed for Food Packaging

“…Then, it would not even be surprising that in Chi-coated samples, higher condensation on the tight surface between the supporting polymer layer that is hydrophobic and the chitosan layer that is hydrophilic might lead to the higher mobility of water vapour molecules and, thus, faster permeation, as seen from higher WVTR values (Table 3). In contrast to the given results, others [53] found that PET/PP food-grade films impregnated with olive leaf extract had a lower WVP after the impregnation. Differences from the present study can be explained by the fact that the used substance was hydrophobic, contrarily to chitosan films that are hydrophilic.…”

Functional, Physical, and Volatile Characterization of Chitosan/Starch Food Films Functionalized with Mango Leaf Extract

“…And finally, the positive values of b* correlated with the yellow tones of the sample, while its negative values indicate the blue tones. Measurements were carried out using a portable spectrophotometer (CM-2600d, Konica Minolta Co., Osaka, Japan) following the method described by Cejudo et al [46]. In addition, in order to establish the total color difference between the functionalized films and their corresponding control samples, the ∆E index, calculated according to Equation (7):…”

Size Dispersion of the Filler Particles and Its Consequences on the Light-Extinction Properties of TiO2/PET Nanocomposite Fibers

“…Poly­(ethylene terephthalate) (PET) has remarkably stable physicochemical properties including excellent chemical resistance, great tensile strength, and high stability in a large temperature range. , PET has thus been used as an indispensable industrial material for a large variety of applications, including making packaging covers, containers, electronic devices, etc. − Specifically, PET is intensively used to produce textile fibers because of its excellent mechanical strength, wrinkle resistance, and excellent friction resistance. , Nevertheless, the high surface gloss of PET has made the fibers difficult to be applied into a larger context of usage. , A practical solution to modify the optical properties of PET fibers is to load nano-sized fillers with light-extinction property, such as TiO 2 nanoparticles, into the PET matrix. The method of particle loading can either be online addition, in which the masterbatches containing TiO 2 nanoparticles are melted and mixed with PET chips, followed by melt spinning to get the nanocomposite fiber (Figure ).…”