title: Antimicrobial, Rheological, and Thermal Properties of Plasticized Polylactide Films Incorporated with Essential Oils to Inhibit Staphylococcus aureus and Campylobacter jejuni.
abstract: Polylactide (PLA) is the most mature biobased and biodegradable polymer. Due to its inherent brittleness, the polymer cannot be used as a packaging material without plasticizer. An attempt was made to develop antimicrobial plasticized PLA film by incorporating polyethylene glycol (PEG) and 3 essential oils (EO), namely cinnamon, garlic, and clove by solvent casting method. Physical, thermal, and rheological properties of those films were evaluated for practical applications whereas the antimicrobial properties were tested against Staphylococcus aureus and Campylobacter jejuni-pathogens related to poultry industry. Both PEG and EOs led to the formation of flexible PLA/PEG/EO films with significant drop in the glass transition temperature (Tg ), and mechanical property. Time-temperature superposition (TTS) principle was employed to melt rheology of EO-based films at selected temperature, and rheological moduli superimposed well in an extended frequency range. Among EOs, cinnamon and clove oil-based films (PLA/PEG/CIN and PLA/PEG/CLO) exhibited a complete zone of inhibition against C. jejuni at the maximum concentration (1.6 mL per 2 g PLA/PEG blend) whereas the garlic oil-based film (PLA/PEG/GAR) had the lowest activity.
authors.affiliation: Food and Nutrition Program, Environment & Life Sciences Research Center, Kuwait Inst. for Scientific Research, P.O. Box 24885, Safat, 13109, Kuwait.
authors.forename: Jasim
authors.initials: J
authors.lastname: Ahmed
authors.affiliation: Food and Nutrition Program, Environment & Life Sciences Research Center, Kuwait Inst. for Scientific Research, P.O. Box 24885, Safat, 13109, Kuwait.
authors.forename: Nikhil
authors.initials: N
authors.lastname: Hiremath
authors.affiliation: Food and Nutrition Program, Environment & Life Sciences Research Center, Kuwait Inst. for Scientific Research, P.O. Box 24885, Safat, 13109, Kuwait.
authors.forename: Harsha
authors.initials: H
authors.lastname: Jacob
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D016123:Campylobacter jejuni / Q000187:drug effects* / Q000254:growth & development; D002935:Cinnamomum zeylanicum / Q000737:chemistry; D045783:Clove Oil / Q000494:pharmacology; D005516:Food Microbiology; D018857:Food Packaging; D005737:Garlic / Q000737:chemistry; D006801:Humans; D009822:Oils, Volatile / Q000494:pharmacology*; D010936:Plant Extracts / Q000494:pharmacology*; D010968:Plasticizers; D011091:Polyesters; D011092:Polyethylene Glycols; D011108:Polymers; D012212:Rheology; D013211:Staphylococcus aureus / Q000187:drug effects* / Q000254:growth & development; D027842:Syzygium / Q000737:chemistry; D013696:Temperature
chemical_list: D000900:Anti-Bacterial Agents; D045783:Clove Oil; D009822:Oils, Volatile; D010936:Plant Extracts; D010968:Plasticizers; D011091:Polyesters; D011108:Polymers; D011092:Polyethylene Glycols; C033616:poly(lactide)
keywords: C. jejuni; antimicrobial packaging; cinnamon oil; clove oil; nanoparticles; rheological; thermal