The Structure and Thermal Stability of Amylose鈥揕ipid Complexes: A Case Study on Amylose鈥揋lycerol Monostearate

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• 作者：Bart Goderis ; Joke A. Putseys ; C茅dric J. Gommes ; Geertrui M. Bosmans ; Jan A. Delcour
• 刊名：Crystal Growth & Design
• 出版年：2014
• 出版时间：July 2, 2014
• 年：2014
• 卷：14
• 期：7
• 页码：3221-3233
• 全文大小：632K
• ISSN：1528-7505

文摘

Three different crystalline amylose鈥揼lycerol monostearate (GMS) complexes with increasing thermal stability can be distinguished: type I, type IIa, and type IIb. All complexes consist of GMS-loaded amylose helices that pack hexagonally into lamellar habits. The complex melting points are proportional to the thickness of the lamellae and depend on the amount of water in the system. For type I complexes, SAXS experiments reveal folded amylose chains and a lamellar thickness governed by the presence of two stretched lipid molecules per amylose helix. In the conversion from type I to type IIa complexes, the short amylose chains unfold and assume a stretched conformation, which increases the number of aligned lipid molecules within the helices to four. In type IIb complexes, another pair of lipid molecules is added. The derived quantitative relation between crystal layer thickness, water content and melting point for amylose鈥揋MS complexes also predicts the melting points of other amylose鈥搈onoacyl glycerol complexes.