化学
淀粉
麦芽糖
蔗糖
果糖
糖
直链淀粉
碳水化合物
双糖
肿胀 的
流变学
食品科学
焓
色谱法
生物化学
化学工程
材料科学
复合材料
工程类
物理
量子力学
作者
Fauziah Ahmad,Peter A. Williams
出处
期刊:Biopolymers
[Wiley]
日期:1999-10-05
卷期号:50 (4): 401-412
被引量:134
标识
DOI:10.1002/(sici)1097-0282(19991005)50:4<401::aid-bip6>3.0.co;2-v
摘要
Studies have been undertaken to investigate the effect of sugars on the thermal and rheological properties of sago starch. Sugars were found to increase the gelatinization temperature T(gel), and gelatinization enthalpy DeltaH. T(gel) and DeltaH increased in the following order: control (water alone) < ribose < fructose < glucose < maltose < sucrose. The increase in DeltaH was greater for 50% starch compared to 10% starch samples. The swelling factors in the presence of sugar were higher compared to the control for sugar concentrations below 25% but were lower at sugar concentration greater than 25%. These effects are discussed in terms of the antiplaticizing effect of the sugars compared to water, the influence of sugar-starch interactions and also the effect of the sugars on water structure. The storage modulus G', the rate constant of gelation k, and the gel strength were significantly reduced in the presence of sugars. Generally G' and k decreased in the following order: control (water alone) > hexose > disaccharide > pentoses. This has been attributed to the reduced proportion of amylose leached following gelatinizatison. In the presence of hexoses the freeze-thaw stability of starch gels decreased while in the presence of disaccharides and pentoses the freeze-thaw stability was slightly improved.
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