Antimicrobial Activity of Immobilized Lysozyme on Plasma-Treated Polyethylene Films

In this study we tested the antimicrobial activity of polyethylene films modified by means of plasma processes that were followed by the chemical immobilization of lysozyme, an antimicrobial enzyme. To chemically immobilize the enzyme in its active form at the surface of polyethylene, substrates tha...

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Bibliographic Details
Published in:Journal of food protection 2008, Vol.71 (1), p.119-125
Main Authors: Conte, A, Buonocore, G.G, Sinigaglia, M, Lopez, L.C, Favia, P, d'Agostino, R, Del Nobile, M.A
Format: Article
Language:English
Subjects:
Anti-Bacterial Agents - pharmacology
antibacterial properties
Biological and medical sciences
coatings
Colony Count, Microbial
Consumer Product Safety
Dose-Response Relationship, Drug
Drug Packaging - methods
edible films
Enzymes, Immobilized
Food industries
Food Microbiology
food packaging
Food Packaging - methods
Food Preservation - methods
food surfaces
Fundamental and applied biological sciences. Psychology
immobilized enzymes
lysozyme
Microbial Sensitivity Tests
Micrococcus - drug effects
Micrococcus - growth & development
Micrococcus - physiology
Muramidase - pharmacology
packaging materials
Polyethylene
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Summary:In this study we tested the antimicrobial activity of polyethylene films modified by means of plasma processes that were followed by the chemical immobilization of lysozyme, an antimicrobial enzyme. To chemically immobilize the enzyme in its active form at the surface of polyethylene, substrates that had been plasma treated under different experimental conditions were soaked in lysozyme solutions at different concentrations. The immobilization of the enzyme was checked, and the antimicrobial activity of the films was investigated by observing the death rate of Micrococcus lysodeikticus cells suspended in phosphate buffer in contact with the films. The results clearly indicate that plasma-treated films loaded with lysozyme are active against the selected microorganism. A modified version of the Gompertz equation was used to quantitatively valuate the dependence of the antimicrobial activity of the films under both plasma treatment conditions and lysozyme concentrations.
ISSN:0362-028X
1944-9097
DOI:10.4315/0362-028x-71.1.119