Abstract
The thermomechanical properties and oxygen permeability of
sorbitol–starch–water films were studied. Sorbitol had an
antiplasticisation effect for contents below 21% (wt%), as indicated by a
ten-fold drop in oxygen permeability 1.43×10−16 cm3 cm/cm2 s Pa for the sample not containing sorbitol and 0.15×10−16 cm3 cm/cm2 s Pa
for the sample containing 8.8% of sorbitol. This behaviour was related
to changes in secondary relaxations. The motions involved in these
relaxations were reduced because of the connections established between
starch and sorbitol, leading to decreased diffusion of oxygen molecules.
For sorbitol contents above 21% (wt%), oxygen permeability increased
slightly. Water produced a classic plasticising effect (an increase of
oxygen permeability), but at low sorbitol content (8.8%) this was only
moderate due to the effect of sorbitol itself (4.3×10−16 cm3 cm/cm2 s Pa for 23.8% of water).
| Original language | English |
|---|---|
| Pages (from-to) | 33-37 |
| Journal | Carbohydrate Polymers |
| Volume | 43 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2000 |
| MoE publication type | A1 Journal article-refereed |