Abstract
Active edible films and coatings incorporating antimicrobial agents such as essential oils are studied to improve the shelf-life of fresh foods. The aim of this work was to study a mixture of sodium caseinate-chitosan (SC:CH), added with mesoporous silica nanoparticles filled with oregano essential oil (MSN-OEO), to produce an active edible coating for Panela cheese and to evaluate its properties during refrigerated storage for 15 days. The OEO was extracted by hydrodistillation and was incorporated into the MSN. Films based on SC:CH of 4:1 and 8:1 ratios with and without MSN-OEO were produced and the mechanical, barrier, physicochemical and microbiological properties of the films were evaluated. The SC:CH 8:1 ratio (w/w) with MSN-OEO showed reduced mean particle size (764.8 ± 23.3 nm), and a stable solution (zeta potential = 29.9 ± 1.1 mV). The thickness and solubility were influenced by the incorporation of MSN-OEO making it thinner and less soluble. Panela cheese samples were coated by the spray method using the SC:CH 8:1 containing MSN-OEO film forming solution. The final pH of the control cheese was 0.5 units lower than that of the coated cheese, whereas final moisture loss of the control cheese was 4.2 times that of the coated cheese. The mesophilic aerobic bacteria and of molds and yeasts populations achieved a reduction of about 2 Log10 UFC/g after 15 days of storage. Due to microbial growth delay, and little moisture loss, this active coating may improve the quality and safety of Panela cheese.
Highlights
In the last few years, advances in the production of edible coatings and films using different compounds from renewable sources has been provided
When oregano essential oil (OEO) was added to the Mesoporous silica nanoparticles (MSNs), homogeneous was observed indicating particles
This is probably that can be classified according to their absolute values as follows: 0–10 mV highly unstaassociated to OEO
Summary
In the last few years, advances in the production of edible coatings and films using different compounds from renewable sources has been provided. It is well known that barrier, mechanical and optical properties of films and coatings depend on both the chemical-physical properties of utilized compounds and their specific interactions [1,2]. Sodium caseinate shows good film-forming and thermoplastic properties due to its random coil structure, and its ability to form weak intermolecular interactions [5,6].
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