TY - JOUR A1 - Schmid, Markus A1 - Zillinger, Wiebke A1 - Müller, Kajetan A1 - Sängerlaub, Sven T1 - Permeation of water vapour, nitrogen, oxygen and carbon dioxide through whey protein isolate based films and coatings—Permselectivity and activation energy T2 - Food Packaging and Shelf Life N2 - The aim of this study was to evaluate the influence of relative humidity (RH) on the oxygen permeability and water vapour transmission rate (WVTR) of whey protein coated Polyethylene terephthalate (PET) or whey protein monolayer films. Furthermore, the activation energies for the permeability of oxygen, carbon dioxide and nitrogen as well as the permselectivities under different set of temperatures were measured. The results showed that the permeability values through the whey protein coating and whey protein film increased with increasing RH. The water vapour permeability measured at 50% RH of (9.3 ± 0.6)−10 cm3 (STP) cm cm−2 s−1 Pa−1 increased to (16.2 ± 0.9)−10 cm3 (STP) cm cm−2 s−1 Pa−1 at 85% RH. An increase in temperature showed an expected increase of the permeability in both uncoated PET and the whey protein monolayer. The permselectivity of whey protein film was determined and the calculated ratios of the permselectivity (P(N2)/P(O2)/P(CO2):1/(4–6/(34–35)) differed from the simplified ratios given in the literature (P(N2)/P(O2)/P(CO2):1/4/16). Furthermore the calculated activation energy values for whey (51 kJ mol−1) were in agreement with other studies. KW - whey protein films KW - PET coatings KW - permselectivity KW - oxygen permeability KW - activation energy Y1 - 2015 UR - https://opus4.kobv.de/opus4-hs-kempten/frontdoor/index/index/docId/151 SN - 2214-2894 VL - 6 SP - 21 EP - 29 PB - Elsevier CY - Amsterdam ER -