期刊
CARBOHYDRATE POLYMERS
卷 43, 期 1, 页码 33-37出版社
ELSEVIER SCI LTD
DOI: 10.1016/S0144-8617(99)00206-4
关键词
starch; sorbitol; oxygen permeability; antiplasticisation
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 x 10(-16) cm(3)/cm(2) s Pa for the sample not containing sorbitol and 0.15 x 10(-16) cm(3) cm/cm(2) 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 x 10(-1)6 cm(3) cm/cm(2) s Pa for 23.8% of water). (C) 2000 Elsevier Science Ltd. All rights reserved.
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