Abstract
The obtainment of new materials with distinct properties by mixing two or more polymers is a potential strategy in sustainable packaging research. In the present work, a blend of cellulose acetate (CA) and zein (60:40 wt/wt CA:zein) was manufactured by adding glycerol or tributyrin as plasticizers (30% wt/wt), and garlic essential oil (GEO), complexed (IC) or not with β-cyclodextrin (βCD), to produce active packaging. Blends plasticized with tributyrin exhibited a more homogeneous surface than those containing glycerol, which showed major defects. The blends underperformed compared with the CA films regarding mechanical properties and water vapor permeability. The presence of IC also impaired the films’ performance. However, the blends were more flexible than zein brittle films. The films added with GEO presented in vitro activity against Listeria innocua and Staphylococcus aureus. The IC addition into films, however, did not ensure antibacterial action, albeit that IC, when tested alone, showed activity against both bacteria. These findings suggest that the mixture of CA and plasticizers could increase the range of application of zein as a sustainable packaging component, while essential oils act as a natural bioactive to produce active packaging.
Highlights
Introduction iationsPlastics revolutionized the food packaging sector since they are available at low cost, flexible, durable, versatile, and have distinct mechanical and barrier properties, suitable for food preservation [1,2]
The inclusion complex (IC) preparation of garlic essential oil (GEO) with βCD was achieved by the kneading method, which was chosen due to the practicality and quality of the technique [20,29]
To calculate the GEO entrapped in ICs, the calibration curve was obtained (Equation (4)) with an adjusted
Summary
Plastics revolutionized the food packaging sector since they are available at low cost, flexible, durable, versatile, and have distinct mechanical and barrier properties, suitable for food preservation [1,2]. In order to reduce the manufacture and use of materials from nonrenewable sources, various strategies are proposed, such as recycling and the total or partial replacement of conventional plastics with bio-based materials [2–9]. Derived from several renewable sources (i.e., agroindustrial byproducts and feedstock), bio-based materials have become increasingly popular among researchers from the packaging area since they fulfill the requirements for sustainable development [2,10]. In this context, several bio-based polymers extracted from different sources have been.
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