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首页> 外文期刊>Crystal growth & design >Characterization of the nanoscale in triacylglycerol crystal networks
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Characterization of the nanoscale in triacylglycerol crystal networks

机译：三酰基甘油晶体网络中的纳米级表征

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Here we report on the characterization of the nanoscale in triacylglycerol crystal networks of edible fats. Blends of tristearin and triolein were prepared in proportions between 20 and 100% w/w to achieve a wide range of supersaturations. Crystal networks were subjected to mechanical disruption using isobutanol at 10 °C and visualized using cryogenic transmission electron microscopy (cryo-TEM). This method allowed the breakdown of spherulitic structures into their primary crystals: nanoplatelets of approximate sizes 150 -60 -30 nm to 370 -160 -40 nm depending on supersaturation conditions, and a length to width aspect ratio of 2.3. The method also allowed the visualization of bimolecular triacylglycerol lamellae within a cross-section of a nanoplatelet. The tristearin d-spacing (～4.5 nm) and domain size (30-50 nm) of the (001) plane, by cryo-TEM and small-angle X-ray diffraction, agreed quantitatively. Scherrer analysis provided an accurate estimate of the cross-sectional thickness of the nanoplatelets and was linearly related to the length and width of the corresponding nanoplatelets, allowing in principle the use of small-angle X-ray diffraction as a rapid and accurate "nanocrystal sizer". A pictorial representation of the hierarchical structure of a triacylglycerol crystal network is presented. This work opens up the possibility of nanomanipulation of the structure of fats to target specific physical properties and physiological response.
机译：在这里我们报告食用油脂的三酰基甘油晶体网络中的纳米级表征。制备硬脂精和三油精的共混物的比例为20至100％w / w，以实现宽范围的过饱和。使用异丁醇在10°C下对晶体网络进行机械破坏，并使用低温透射电子显微镜（cryo-TEM）对其进行可视化。这种方法可以将球状结构分解成其初级晶体：纳米片的大小大约为150 -60 -30 nm至370 -160 -40 nm（取决于过饱和条件），长宽比为2.3。该方法还允许在纳米血小板的横截面内可视化双分子三酰基甘油薄片。通过冷冻透射电镜和小角X射线衍射，在（001）平面上的三硬脂精d-间隔（〜4.5 nm）和畴尺寸（30-50 nm）在数量上是一致的。 Scherrer分析提供了对纳米片横截面厚度的准确估计，并且与相应纳米片的长度和宽度呈线性关系，原则上允许使用小角度X射线衍射作为快速，准确的“纳米晶尺寸测定仪” ”。呈现了三酰基甘油晶体网络的分层结构的图示。这项工作开辟了对脂肪结构进行纳米操作以针对特定物理特性和生理反应的可能性。

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