Abstract
Nowadays, active packaging is becoming significant for the extension of the shelf life of food products via the incorporation of raw nanomaterials such as nanoclays and bioactive compounds such as essential oils (EO). This study aims to study the performance of the sodium montmorillonite (NaMt) and organically modified montmorillonite (OrgMt) as thyme (TO), oregano (OO), and basil (BO) essential oil (EO) control release nanocarriers in low-density poly-ethylene (LDPE) active films. NaMt and OrgMt nanofillers are modified with low (20 wt.%), medium (40 wt.%), and high (80 wt.%) nominal contents of TO, OO, and BO. The novel active packaging films were tested using the X-ray diffraction method (XRD), tensile, water, and oxygen barrier properties, and antioxidant activity tests. For the two most active packaging films, the lipid oxidation of chicken breast fillets estimated by the thiobarbituric-acid-reacting substances (TBARS) method. Overall study shows that both NaMtEO-based and OrgMt-based films exhibited controllable and sustained antioxidant activity. All films retained up to 50–70% of their antioxidant activity after six months of incubation. OrgMtEO-based LDPE films showed more significance applied as active packaging films than NaMtEO-based LDPE films because of their highest tensile and barrier properties.
Highlights
One of the most recent trends of nanotechnology [1] in the food industry is the incorporation of natural antioxidants (AO) to active packaging films due to its advantages compared to the addition of such natural antioxidants directly to the food [2]
The main conclusion of this study was the successful incorporation of novel NaMtEO and OrgMtEO nanohybrids into the low-density poly-ethylene (LDPE) matrix to develop promising active packaging films with controllable and long-life antioxidant activity
The highest antioxidant activity was for films containing thyme oil (TO) and OO
Summary
One of the most recent trends of nanotechnology [1] in the food industry is the incorporation of natural antioxidants (AO) to active packaging films due to its advantages compared to the addition of such natural antioxidants directly to the food [2]. It was proposed that adsorption of EO onto an inorganic porous material [8,9] could provide controlled release and protection against polymer processing conditions In this direction, EO nanocarriers, such as commercial organically modified montmorillonite (OrgMt) [10] and halloysite [11,12], used in polymers-based [6,13,14,15] and biopolymers-based [16,17,18,19] active packaging films. Campos-Requena et al [18] studied the release of essential oil constituents from thermoplastic starch/layered silicate bionanocomposite films They concluded that it is possible to predict the release of the EO by knowing the formulation characteristics of packaging material
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