3.3. Swelling and water uptake capacity
Swelling and water uptake percentage for the gelatin film were
391 11% and 135 5%, respectively. Incorporation of ZMO (4%, 6%
and 8% w/w of gelatin) into the gelatin films caused a significant decrease in the swelling (Table 1) and water uptake (Table 1) of the
films (p < 0.05). Gelatin is a hydrophilic material that is expected to
absorb water molecules. The porous gelatin films showed higher
swelling capacity because the porosity in their network structures
that allows more water to enter inside the film. Incorporation of
ZMO could reduce swelling capacity of the gelatin films which,
might be related to hydrophobic nature of ZMO. Hydrophobic domains
of gelatin can essentially interact with ZMO through hydrophobic
interaction and thereby enhance interfacial interaction
between matrix (gelatin) and filler (ZMO) (Hong et al., 2009; Rhim
et al., 2000). This event saturates gelatin network with ZMO thus,
water molecules cannot diffuse to gelatin network thereby swelling
is decreased. These results suggest that gelatin films incorporated
with ZMO could be promising candidates for liquid absorbing
packaging materials.
3.3. Swelling and water uptake capacitySwelling and water uptake percentage for the gelatin film were391 11% and 135 5%, respectively. Incorporation of ZMO (4%, 6%and 8% w/w of gelatin) into the gelatin films caused a significant decrease in the swelling (Table 1) and water uptake (Table 1) of thefilms (p < 0.05). Gelatin is a hydrophilic material that is expected toabsorb water molecules. The porous gelatin films showed higherswelling capacity because the porosity in their network structuresthat allows more water to enter inside the film. Incorporation ofZMO could reduce swelling capacity of the gelatin films which,might be related to hydrophobic nature of ZMO. Hydrophobic domainsof gelatin can essentially interact with ZMO through hydrophobicinteraction and thereby enhance interfacial interactionbetween matrix (gelatin) and filler (ZMO) (Hong et al., 2009; Rhimet al., 2000). This event saturates gelatin network with ZMO thus,water molecules cannot diffuse to gelatin network thereby swellingis decreased. These results suggest that gelatin films incorporatedwith ZMO could be promising candidates for liquid absorbingpackaging materials.
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