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. 2020 Oct 25;8(12):6568-6579.
doi: 10.1002/fsn3.1946. eCollection 2020 Dec.

The effect of Macro and Nano-emulsions of cinnamon essential oil on the properties of edible active films

Reza Fattahi  1 , Babak Ghanbarzadeh  1   2 , Jalal Dehghannya  1 , Mohammadyar Hosseini  3 , Pasquale M Falcone  4
Affiliations

The effect of Macro and Nano-emulsions of cinnamon essential oil on the properties of edible active films

Reza Fattahi et al. Food Sci Nutr. .

Abstract

The effect of Nano-emulsion (NE) and Macro-emulsion (ME) of cinnamon essential oil (CEO) on the properties of carboxymethyl cellulose (CMC)-based films was investigated. MEs (diameters of 242-362 nm) and NEs (diameters of 59-80 nm) of CEO were produced through Ultra-Turrax and Ultrasonication, respectively. The scanning electron microscopy (SEM) and atomic force microscopy (AFM) images showed different morphologies in the films containing ME and NE, also a denser and more uniform microstructure was observed in the NE films in comparison with the ME ones. The higher stability of NE in the CMC matrix, increased the thickness of the resulted films. The water vapor permeability (WVP) was increased from 2.59 × 10-9 g/ms Pa in the control film to 4.43 × 10-9 g/m s Pa in the ME film, and decreased to 1.80 × 10-9 g/ms Pa in the NE film. Adding CEO led to more flexible films with enhanced strain at break (SAB) from 53.56% in the control film to 80% and 94.77% in the ME and NE films, respectively. The antifungal indices against A. niger and M. racemous were 14.16% and 20.82% in the ME films, and were improved to 18.81% and 25% in the NE ones.

Keywords: Macro‐emulsion; Nano‐emulsion; cinnamon essential oil; emulsified film.

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Figures

Figure 1
Figure 1
Scanning electron microscopy (SEM) images of the surface of the CMC control film and films loaded with ME (CMC‐ME‐CEO) and NE (CMC‐NE‐CEO) of CEO at selected concentration of CEO 0.9708%. CEO, cinnamon essential oil; CMC, carboxymethyl cellulose; ME, Macro‐emulsion; NE, Nano‐emulsion
Figure 2
Figure 2
Scanning electron microscopy (SEM) images of the cross‐section of the CMC control film and films loaded with ME (CMC‐ME‐CEO) and NE (CMC‐NE‐CEO) of CEO at selected concentration of CEO 0.9708%. CEO, cinnamon essential oil; CMC, carboxymethyl cellulose; ME, Macro‐emulsion; NE, Nano‐emulsion
Figure 3
Figure 3
Atomic force microscopy (AFM) images of the surface topography of the CMC control film and films loaded with ME (CMC‐ME‐CEO) and NE (CMC‐NE‐CEO) of CEO at selected concentration of CEO 0.9708%. CEO, cinnamon essential oil; CMC, carboxymethyl cellulose; ME, Macro‐emulsion; NE, Nano‐emulsion
Figure 4
Figure 4
Representative stress–strain curves of the films
Figure 5
Figure 5
Water vapor permeability (WVP) of the control CMC film and films loaded with ME and NE of CEO at different concentrations. Bars with different letters represent statistical differences (p < .05). CEO, cinnamon essential oil; CMC, carboxymethyl cellulose; ME, Macro‐emulsion; NE, Nano‐emulsion
See this image and copyright information in PMC

References

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