Moisture sorption and water vapor permeability of soy protein isolate/poly(vinyl alcohol)/glycerol blend films

Effect of drying conditions and plasticizer type on some physical and mechanical properties of amaranth flour films

“…The parameters for the GAB equation are summarized in Table 3. All the water sorption curves of the films are sigmoid in shape, revealing a slower increase in the equilibrium moisture content until a w 0.6; thereafter, there is a dramatic increase in the slope of the isotherm, indicating the presence of non-bound or free-state water associated with enhanced solubilization (Hernández-Muñoz, Kanavouras, Ng, & Gavara, 2003;Su et al, 2010). For the films containing sorbitol, at lower a w (<0.5) there is clear reduction in the equilibrium moisture content of the films with rising temperature.…”

Controlled release of sorbic acid from bacterial cellulose based mono and multilayer antimicrobial films

“…The final measurement was done after 2 days of incubation. WVP was determined for three replicate samples for each type of film, as follows (Su et al, 2010):…”

“…Combining BC and PVA properties (odourless, nontoxic, chemical resistance, good mechanical properties), the obtained nanocomposites met the desired characteristics for biomedical applications (Millon, Oates, & Wan, 2009;Mohammadi, Boughner, Millon, & Wan, 2009). However, because high moisture sensitivity was considered a drawback in the use of both BC and PVA, only a few applications in the food packaging industry were reported: as active packaging to control contamination on the surface of products (Nguyen, Gidley, & Dykes, 2008;Sin, Rahman, Rahmat, & Samad, 2010;Su et al, 2010;Zhang et al, 2011) or oxygen-scavenger films using aerobic microorganisms (Altieri et al, 2004). Recently, our research group showed that PVA-BC composites could be used as biodegradable packaging materials (Stoica-Guzun et al, 2011).…”

Characterization of soy protein-based films prepared with acids and oils by compression

“…Hydrophobic groups on the surface decrease the initial step of sorption. On the other hand, hydrogen bonding between natural polymers and additives may increase free volume, enhancing the process of water passage through the film (Cuq et al, 1997;Sobral et al 2001;Su et al, 2010).…”