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Edible antimicrobial films based on microencapsulated lemongrass oil

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Abstract

Edible films and coatings have been proposed as viable alternatives for the preservation of fresh food such as fruit, meat, fish and cheese. They can be designed to contain natural antioxidants, vitamins and antimicrobials in order to extend shelf life of the product keeping the natural sensorial properties. Essential oils have been targeted as potential active principles for edible films and coatings given their well-recognized antioxidant, antimicrobial and sensory properties. In the present work, lemongrass oil (LMO) microcapsules were prepared by the emulsification-separation method using sodium caseinate as wall material. Microcapsules had an average size of 22 μm and contained over 51 % oil in their nucleus. The release kinetics of the LMO components was studied for both, microcapsules and microcapsule containing films. Experimental data for the controlled release of LMO components showed good correlation with Peppas and Weibull models. The effect of the alginate matrix on the release parameters of the mathematical models could be detected by the modification of the b constant of the Weibull equation which changed from 0.167 for the microcapsules to 0.351 for the films. Films containing LMO at concentrations of 1250, 2500 and 5000 ppm were able to inhibit growth of Escherichia coli ATCC 25922 and Listeria monocytogenes ISP 65–08 in liquid cultures. A possible future application of these films for shelf life extension of fresh food is discussed.

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Acknowledgments

The authors thank the financial support of the Chilean National Commission of Science and Technology (CONICYT), through the Research Grant FONDECYT N° 1131017.

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Correspondence to Rubén O. Bustos C..

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Research highlights

1. Lemongrass oil was microencapsulated within a sodium caseinate wall to generate microparticles of 22 μm in diameter containing 51 % oil by weight.

2. Microencapsulated lemongrass oil was introduced into alginate films and their controlled released kinetics data were fitted to Higuchi, Peppas and Weibull models.

3. The Weibull model was the best suited for the study of these systems since it allows that the microstructural differences between the caseinate shell of the microcapsules and the alginate matrix of the film can be expressed in the value of the b exponent of the model equation.

4. Films containing microencapsulated lemongrass oil were able to inhibit growth of Escherichia coli ATCC 25922 and Listeria monocytogenes ISP 65–08 in liquid cultures.

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Bustos C., R.O., Alberti R., F.V. & Matiacevich, S.B. Edible antimicrobial films based on microencapsulated lemongrass oil. J Food Sci Technol 53, 832–839 (2016). https://doi.org/10.1007/s13197-015-2027-5

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  • DOI: https://doi.org/10.1007/s13197-015-2027-5

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