Crystal morphology, microstructure, and textural properties of model lipid systems
Crystal morphology, microstructure, and textural properties of model lipid systems
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模型脂质系统的晶体形态、微观结构和结构特性
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
R. Hartel
中科院分区：
文献类型：
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作者：
Yuping Shi;B. Liang;R. Hartel
将含有高熔点和低熔点脂类的模型脂系统的混合物结晶，并获得显微镜图像，用于分析晶体形态和微观结构。利用织构分析仪测试了这些半固态体系的流变特性。混合物中高熔点成分的性质决定了晶体形态，并与晶体和液体材料之间的相互作用相结合，导致不同的微观结构影响了流变性能。除了晶体材料的大小、形状和数量（固体脂肪含量）外，晶体堆积密度（代表晶体颗粒在每一层（个体、聚集体或絮团）的排列密度）以及连接晶体颗粒的链接（或桥）的性质（或强度）是决定流变性能的重要微观结构因素。根据不同的晶体堆积密度和连接桥，确定了两种不同的微观结构类型-移动和不移动，其中微结构组分的相对迁移率不同。这些迁移率水平导致了不同的流变反应。
Mixtures of model lipid systems containing high-melting and low-melting lipid classes were crystallized and microscope images obtained for analysis of crystal morphology and microstructure. Rheological properties of these semisolid systems were tested by use of a texture analyzer. The nature of the highmelting component in a mixture dominated the crystal morphology and, combined with interactions between crystalline and liquid materials, resulted in different microstructures that influenced the rheological properties. In addition to size, shape, and amount (solid fat content) of crystalline material, the crystal packing density, representing how densely the crystalline particles in every level (individual, aggregate, or floc) were arranged, and the nature (or strength) of the link (or bridge) connecting the crystalline particles were important microstructural factors to determine rheological properties. Depending on different crystal packing densities and linking bridges, two different systems were identified in terms of microstructure type—mobile and immobile—in which the relative mobility of microstructural components had different levels. These mobility levels led to different rheological responses.