Hills B P, Godward J, Manning C E, Biechlin J L, Wright K M
Institute of Food Research, Colney, Norwich, UK.
Magn Reson Imaging. 1998 Jun-Jul;16(5-6):557-64. doi: 10.1016/s0730-725x(98)00054-x.
Nuclear magnetic resonance (NMR) relaxation and q-space diffusion measurements have been used to probe the microscopic water distribution in a variety of starch-based systems, including packed beds of native starch granules with varying water contents, starch gels, and freeze-dried starch gels. The q-space data for the granular beds is compared with a variety of theoretical models and conforms best to unbounded diffusion in a lower dimensional space. In contrast to some earlier reports, the data for the gelatinized samples are not anomalous and conform to simple unrestricted diffusion in a three-dimensional space. The paper concludes with a novel method for probing pore size distribution in freeze-dried starch gels by infusion of acetone.
核磁共振（NMR）弛豫和q空间扩散测量已被用于探测各种淀粉基体系中的微观水分布，包括不同含水量的天然淀粉颗粒填充床、淀粉凝胶和冻干淀粉凝胶。将颗粒床的q空间数据与各种理论模型进行比较，结果最符合低维空间中的无界扩散。与一些早期报告不同，糊化样品的数据并非异常，而是符合三维空间中的简单无限制扩散。本文最后介绍了一种通过注入丙酮来探测冻干淀粉凝胶孔径分布的新方法。
