G. Galietta et al., Barrier properties of whey protein isolate films to carbon dioxide and ethylene at various water activities, COLLOQ INRA, (91), 1999, pp. 327-335
A cell designed and constructed in the Laboratory of Surface Chemistry (LAF
IDESU) of the Faculty of Chemistry, Uruguay, is used to determine permeabil
ities of whey protein isolate films to Carbon Dioxide and Ethylene at vario
us water activities. As usual in hydrophilic films, permeabilities increase
considerably when water activities increase. In a sorption electrobalance,
sorption isotherms of CO2 and C2H4 (5 % in N-2) are performed on films at
various contents of water. The amounts of gases sorbed increase with higher
water activities.