According to Teixeira et al (2007), this particular behavior can

According to Teixeira et al. (2007), this particular behavior can be attributed buy GSK2126458 to the fact that sucrose has

a higher number of OH groups than other sugars and, therefore, is more hydrophilic and is a more efficient plasticizing agent. In the second phase of the work, as can be observed in Table 3, an increase of clay and glycerol contents caused a decrease of TS. For each content of clay nanoparticles, an increase of glycerol content from 0.75 g to 1.25 g caused a significant decrease of TS (P < 0.05). The same tendency can be observed for each glycerol content: an increase of clay nanoparticles content decreases significantly the TS of the films (P < 0.05). The regression analysis applied on results, using the response surface methodology, Alectinib cell line indicated that both glycerol (G) and clay nanoparticles (C) content, as well as their interaction, influenced significantly this property and the fitted model, in real values is (r2 = 72%): equation(4) TS=(5.62−1.83×G+21×C−28×G×C)±0.59(0.75≤G≤1.25)(0.00≤C≤0.10)wherein

TS is the tensile strength of films [MPa]; G is the glycerol content [g/100 g of filmogenic solution]; and C is the clay nanoparticles content [g/100 g of filmogenic solution]. As can be observed in Fig. 2(a), higher contents of glycerol and clay yield films with lower TS. For films formulated without clay nanoparticles, the E decreased as glycerol content increased, as Ribose-5-phosphate isomerase expected, confirming the results obtained in the first phase. An opposite effect was observed for films produced with clay nanoparticles, i.e., for each clay content, with increasing glycerol content, E of the films increased. This effect was more pronounced and significant (P < 0.05)

with higher clay nanoparticles content (0.10 g/100 g). ANOVA applied on results of water vapor permeability and oxygen permeability coefficient indicated that the glycerol content influenced significantly these properties (P < 0.05), since a rise in glycerol content caused an increase in both permeabilities ( Table 2). As mentioned earlier, glycerol is a relatively small hydrophilic molecule, which can be entrapped between adjacent polymeric chains, decreasing intermolecular attractions and increasing molecular mobility, facilitating migration of water vapor and oxygen molecules ( Rodríguez, Osés, Ziani, & Maté, 2006). Similar tendencies have been reported for BF based on potato starch (Rodríguez et al., 2006 and Talja et al., 2007), yam starch (Mali, Grossmann, García, Martino, & Zaritzky, 2004), corn starch (Bertuzzi et al., 2007) and cassava starch (Alves et al., 2007 and Chillo et al., 2008). In Table 3, the positive influence caused by the addition of clay nanoparticles on water vapor permeability and oxygen permeability coefficient can be noticed.

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