Characterization of polylactic acid films for food packaging as affected by dielectric barrier discharge atmospheric plasma

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Innovative Food Science & Emerging Technologies, ISSN: 1466-8564, Vol: 21, Page: 107-113

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S. K. Pankaj; C. Bueno-Ferrer; N. N. Misra; P. Bourke; P. J. Cullen; L. O'Neill; A. Jiménez
Elsevier BV; Dublin Institute of Technology
Agricultural and Biological Sciences; Chemistry; Engineering; Polylactic acid; DBD plasma; In-package; TGA; DSC; AFM; oxygen permeability; water vapor permeability; overall migration; Food and beverages, Other engineering and technologies; Condensed Matter Physics
article description
Dielectric barrier discharge (DBD) air plasma is a novel technique for in-package decontamination of food, but it has not been yet applied to the packaging material. Characterization of commercial polylactic acid (PLA) films was done after in-package DBD plasma treatment at different voltages and treatment times to evaluate its suitability as food packaging material. DBD plasma increased the roughness of PLA film mainly at the site in contact with high voltage electrode at both the voltage levels of 70 and 80 kV. DBD plasma treatments did not induce any change in the glass transition temperature, but significant increase in the initial degradation temperature and maximum degradation temperature was observed. DBD plasma treatment did not adversely affect the oxygen and water vapor permeability of PLA. A very limited overall migration was observed in different food simulants and was much below the regulatory limits.