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  4. Supercritical CO2 impregnation of PLA/PCL films with natural substances for bacterial growth control in food packaging
 
Zitierlink DOI
10.26092/elib/2612
Verlagslink DOI
10.1016/j.foodres.2018.02.065

Supercritical CO2 impregnation of PLA/PCL films with natural substances for bacterial growth control in food packaging

Veröffentlichungsdatum
2018-03-21
Autoren
Milovanovic, Stoja  
Hollermann, Gesa  
Errenst, Cornelia  
Pajnik, Jelena  
Frerich, Sulamith  
Kroll, Stephen  
Rezwan, Kurosch  
Ivanovic, Jasna  
Zusammenfassung
Biodegradable polymers with antibacterial properties are highly desirable materials for active food packaging applications. Thymol, a dietary monoterpene phenol with a strong antibacterial activity is abundant in plants belonging to the genus Thymus. This study presents two approaches for supercritical CO2 impregnation of poly(lactic acid)(PLA)/poly(ε-caprolactone)(PCL) blended films to induce antibacterial properties of the material: (i) a batch impregnation process for loading pure thymol, and (ii) an integrated supercritical extraction-impregnation process for isolation of thyme extract and its incorporation into the films, operated in both batch or semi-continuous modes with supercritical solution circulation. The PCL content in films, impregnation time and CO2 flow regime were varied to maximize loading of the films with thymol or thyme extract with preserving films' structure and thermal stability. Representative film samples impregnated with thymol and thyme extract were tested against Gram (-) (Escherichia coli) and Gram(+) (Bacillus subtilis) model strains, by measuring their metabolic activity and re-cultivation after exposure to the films. The film containing thymol (35.8 wt%) showed a strong antibacterial activity leading to a total reduction of bacterial cell viability. Proposed processes enable fast, controlled and organic solvent-free fabrication of the PLA/PCL films containing natural antibacterial substances at moderately low temperature, with a compact structure and a good thermal stability, for potential use as active food packaging materials.
Schlagwörter
Antibacterial food packaging

; 

Poly(lactic acid)

; 

Poly(ε-caprolactone)

; 

Supercritical CO(2) impregnation

; 

Thyme extract

; 

Thymol
Verlag
Elsevier {BV}
Institution
Universität Bremen  
Fachbereich
Fachbereich 04: Produktionstechnik, Maschinenbau & Verfahrenstechnik (FB 04)  
Institute
Fachgebiet 17: Keramische Werkstoffe und Bauteile  
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Food research international  
Band
107
Startseite
486
Endseite
495
Seitenzahl
10
Zweitveröffentlichung
Ja
Dokumentversion
Postprint
Lizenz
https://creativecommons.org/licenses/by-nc-nd/4.0/
Sprache
Englisch
Dateien
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Vorschaubild
Name

MILOVANOVIC - Supercritical CO2 impregnation of PLA.pdf

Size

1.43 MB

Format

Adobe PDF

Checksum

(MD5):3adde0cb8d6b9b4d844b8e1cea558632

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