Effect of cellulose nanocrystals on thyme essential oil release from alginate beads: study of antimicrobial activity against Listeria innocua and ground meat shelf life in combination with gamma irradiation

Thyme essential oil (EO) loaded alginate beads (1–3%) containing cellulose nanocrystals (CNCs) (0–40% polymer dry basis) were prepared in order to study EO release profile in simulating solvent and the antimicrobial effect against Listeria innocua via in vitro and in situ tests. Introduction of CNCs...

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Bibliographic Details
Published in:Cellulose (London) 2019-06, Vol.26 (9), p.5247-5265
Main Authors: Criado, Paula, Fraschini, Carole, Jamshidian, Majid, Salmieri, Stephane, Desjardins, Natacha, Sahraoui, Affef, Lacroix, Monique
Format: Article
Language:English
Subjects:
Alginates
Antiinfectives and antibacterials
Antimicrobial agents
Beads
Bioorganic Chemistry
Cellulose
Ceramics
Chemical and Process Engineering
Chemistry
Chemistry and Materials Science
Composites
Engineering Sciences
Field tests
Food irradiation
Gamma irradiation
Gamma rays
Glass
Life extension
Life Sciences
Listeria
Listeria innocua
Meat
Nanocrystals
Natural Materials
Oils & fats
Organic Chemistry
Original Research
Pasteurization
Physical Chemistry
Polymer Sciences
Reduction
Shelf life
Sustainable Development
Thyme
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Summary:Thyme essential oil (EO) loaded alginate beads (1–3%) containing cellulose nanocrystals (CNCs) (0–40% polymer dry basis) were prepared in order to study EO release profile in simulating solvent and the antimicrobial effect against Listeria innocua via in vitro and in situ tests. Introduction of CNCs from 0 to 30% in alginate beads exhibited an increase of EO loading capacity from 0.12 to 0.17% and a kinetic release constant (k) decrease from 9.85 to 6.77 when beads were prepared with 3% thyme EO, respectively. These optimal concentrations were selected in order to assess the antimicrobial efficiency to eliminate L. innocua and to reduce the mesophilic total flora (MTF) on ground meat during storage. Results showed that ground meat containing active alginate beads showed a 2 log reduction of L. innocua during more than 10 days as compared to the control. The influence of gamma-irradiation treatment was studied on MTF of ground meat, allowing a 4 log reduction during 14 days when alginate beads containing 3% thyme EO were added. A synergy between thyme EO and irradiation was observed in terms of L. innocua elimination and shelf-life extension.
ISSN:0969-0239
1572-882X
DOI:10.1007/s10570-019-02481-2