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Characterization, Antioxidant and Antibacterial Activity of Essential Oils and Their Encapsulation into Biodegradable Material Followed by Freeze Drying    

Mariia Kokina1orcid tiny, Ana Salević1orcid tiny, Ana Kalušević1,2orcid tiny, Steva Lević1orcid tiny, Milena Pantić1orcid tiny, Dejan Pljevljakušić3orcid tiny, Katarina Šavikin3orcid tiny, Mark Shamtsyan4orcid tiny, Miomir Nikšić1orcid tiny and Viktor Nedović1*orcid tiny  

1University of Belgrade, Faculty of Agriculture, Department of Food Technology and Biochemistry, Nemanjina 6, 11080 Belgrade, Serbia 
2Institute of Meat Hygiene and Technology, Kaćanskog 13, 11040 Belgrade, Serbia  
3Institute for Medicinal Plants Research “Dr Josif Pančić”, Tadeuša Košćuška 1, 11000 Belgrade, Serbia 
4Saint Petersburg State Institute of Technology (Technical University), Department of Technology of Microbiological Synthesis, Moskovsky Prospect 26, 190013 Saint Petersburg, Russia  

Article history
Received: 25 July 2018 
Accepted: 21 March 2019

Key words
alginate, essential oils, high volatility, natural preservatives   

The study assessed the antimicrobial and antioxidant activities of commonly used and commercially available essential oils as an alternative to synthetic preservatives. The plant sources were as follows: lavender (Lavandula angustifolia), tea tree (Melaleuca alternifolia), bergamot (Citrus bergamia) and peppermint (Mentha piperita). The antioxidant activity of essential oils was tested by the 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2´-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) methods. The microdilution broth susceptibility assay revealed that lavender and bergamot essential oils were more efficient in inhibiting the bacterial growth than other tested oils, with the minimum inhibitory concentration of 5 μg/mL. This study also reports the successful implementation of an electrostatic extrusion technique for encapsulating essential oils into alginate beads, which enables the essential oils to maintain their free radical scavenging ability over time.   

*Corresponding author:  tel3  +381114413154

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