Physicochemical characterization of plasma-treated sodium caseinate film |
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| Affiliation: | 1. BioPlasma Research Group, School of Food Science and Environmental Health, Dublin Institute of Technology, Cathal Brugha Street, Dublin 1, Ireland;2. FOCAS Research Institute/School of Physics, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland;3. Teagasc Food Research Centre, Ashtown, Dublin, Ireland;4. School of Chemical Engineering, UNSW Australia, Sydney, NSW 2052, Australia;1. Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands;2. Dutch Polymer Institute (DPI), P.O. Box 902, 5600 AX Eindhoven, The Netherlands;3. Dutch Institute for Fundamental Energy Research (DIFFER), P.O. Box 1207, 3430 BE Nieuwegein, The Netherlands;4. Philips Research, High Tech Campus 4, 5656 AE Eindhoven, The Netherlands;5. Solar Research SOLLIANCE, High Tech Campus 5, 5656 AE Eindhoven, The Netherlands;1. Department of Physics, Faculty of Science, University of Guilan, Postal Code 4193833697, Rasht, Iran;2. Plasma Physics and Nuclear Fusion Research School, Nuclear Science and Technology Research Institute, AEOI, PO Box 14155-1339, Tehran, Iran |
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| Abstract: | Sodium caseinate films were physico-chemically characterized for the effects of atmospheric dielectric barrier discharge (DBD) plasma as function of applied voltage and treatment times. Surface roughness of plasma treated films at both 60 and 70 kV was found to be significantly (p ≤ 0.05) higher than the control. Glass transition temperature of all the films after plasma treatment was found to be less than the control film. The increase in the O/C atomic ratio shows the formation of new oxygen-containing groups on the film surface. XRD and FT-IR spectra suggest a disruption in the inter-helical structure without any change in the helical configuration of the protein molecules. Increase in the hydrophilicity of the sodium caseinate film was also observed after DBD plasma, but no significant (p > 0.05) increase in the WVTR and OTR was noticed, showing the suitability of the film for novel processes such as in-package plasma decontamination of food. |
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