Non-destructive, quantitative characterization of extruded starch-based products by magnetic resonance imaging and X-ray microtomography
Non-destructive, quantitative characterization of extruded starch-based products by magnetic resonance imaging and X-ray microtomography
复制标题
DOI：
10.1016/j.jfoodeng.2013.10.006
复制
发表时间：
2014-03-01
影响因子：
5.5
通讯作者：
Schuchmann, Heike Petra
中科院分区：
文献类型：
--
作者：
Horvat, Mario;Guthausen, Gisela;Schuchmann, Heike Petra
采用核磁共振成像（MRI）对淀粉基挤出制品的孔隙结构进行了无损表征。样品是用双螺杆挤出机对玉米粉进行挤压蒸煮得到的。在不同的机械能输入下对试样进行挤压，随后对孔隙尺寸分布进行了分析。介绍并讨论了两种不同的样品制备方法。阴性显像是有利的技术。在这种方法中，用环己烷填充孔，并用MRI检测溶剂。以已知尺寸的玻璃微珠作为参考样品，验证了分析方法的有效性。MRI检测到的孔隙尺寸略大于玻璃珠的实际尺寸。当对挤压玉米粉样品进行分析时，我们能够证明，尽管膨胀指数相等，样品可以有不同的孔径分布。最后，将孔径分布与x射线显微断层扫描分析进行了比较，并讨论了两种方法的优缺点。(C) 2013 Elsevier Ltd.版权所有。
Magnetic resonance imaging (MRI) was used for non-destructive characterization of the pore structure of starch-based extruded products. The samples were obtained by extrusion cooking of corn meal in a twin screw extruder. The samples were extruded at varying mechanical energy input and, subsequently, the pore size distributions were analyzed. Two different sample preparation methods were introduced and discussed. Negative imaging was the favorable technique. In this method, the pores are filled with cyclohexane and the solvent is detected by MRI. The analysis method was validated by glass beads of known size as reference samples. The pore sizes detected by MRI were slightly higher than the real size of the glass beads. When extruded corn meal samples were analyzed, we were able to show, that despite an equal expansion index, samples can have different pore size distributions. Finally, the pore size distributions were compared to analysis via X-ray microtomography and advantages and limitations of both methods were discussed. (C) 2013 Elsevier Ltd. All rights reserved.