Marzec E, Warchoł W
Department of Biophysics, Poznań University of Medical Sciences, Fredry 10, 61-701 Poznań, Poland.
Bioelectrochemistry. 2005 Feb;65(2):89-94. doi: 10.1016/j.bioelechem.2004.10.001. Epub 2004 Nov 6.
Dielectric spectroscopy has been applied to study aspects of the organization of water in selected animal tissues (tendon, bone and horn). The measurements of the relative permittivity epsilon' and the dielectric loss epsilon'' were carried over the frequency range of 10-100 kHz and at temperatures from 22 to 240 degrees C. The water content was 10% for bone and horn, and 22% for tendon by mass at room temperature at a relative humidity of 70%. The temperature dependencies of epsilon' and epsilon'' reveal distinctively the temperature ranges corresponding to the release of water in temperatures up to about 200 degrees C for all tissues and the melting of the crystalline structure only for tendon and horn, above this temperature. The frequency dependencies of epsilon' and epsilon'' show a remarkable dispersion in the low-frequency at selected temperatures up to 200 degrees C for all tissues due to the release of the loosely and strongly bound water. The results were discussed in terms of the interfacial (Maxwell-Wagner) polarization and polarization mechanism involving hopping charge carriers interacting with the bound water molecules. The information on the effect of temperature, water content and frequency of the electromagnetic field on the dielectric behaviour of the tissues studied is of importance in the design and construction of medical diagnostic or therapeutic instruments based on the use of electric signals.
介电谱已被用于研究特定动物组织（肌腱、骨骼和角）中水的组织情况。相对电容率ε'和介电损耗ε''的测量在10 - 100 kHz的频率范围内以及22至240摄氏度的温度下进行。在室温及70%相对湿度条件下，骨骼和角的含水量按质量计为10%，肌腱的含水量为22%。ε'和ε''对温度的依赖性明显揭示了所有组织在高达约200摄氏度的温度下对应水释放的温度范围，以及仅肌腱和角在该温度以上时晶体结构的熔化。ε'和ε''对频率的依赖性表明，由于松散结合水和强结合水的释放，在高达200摄氏度的选定温度下，所有组织在低频处都有显著的色散。根据界面（麦克斯韦 - 瓦格纳）极化以及涉及跳跃电荷载流子与结合水分子相互作用的极化机制对结果进行了讨论。关于温度、含水量和电磁场频率对所研究组织介电行为的影响的信息，在基于电信号使用的医学诊断或治疗仪器的设计和构建中具有重要意义。
