Dielectric properties of raw milk as influenced by frequency, salts, and salt contents
Dielectric properties of raw milk as influenced by frequency, salts, and salt contents
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原料奶的介电特性受频率、盐和盐含量的影响
DOI：
10.1111/jfpe.12885
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发表时间：
2018-09
影响因子：
3
通讯作者：
Guo Wenchuan
中科院分区：
文献类型：
--
作者：
Zhu Xinhua;Liu Qiang;Guo Wenchuan
了解盐和盐含量对介电性能的影响（介电常数ε′和介电损耗因子ε″），分别通过添加NaCl、MgCl 2和KCl获得总盐含量（以质量计）为0.75- 0.87%、0.75- 0.93%和0.75-0.90%的生牛乳样品的介电性质，000 MHz，25 °C，使用阻抗分析仪。结果表明，ε′随频率的增加而减小，ε″呈“V”形变化，在1,500 MHz附近有最小值。在一定的频率和相同的食盐添加量下，添加NaCl和MgCl 2的牛奶的ε″分别最小和最大。在40 MHz附近，ε′与牛奶中的总盐含量有很好的正线性关系，对NaCl、MgCl 2和KCl的决定系数分别为0.96、0.98和0.95。ε″随总盐含量的增加而线性增加，在900 MHz以下的频率决定系数大于0.99，在900 MHz以上的频率决定系数大于0.86实际应用表明，材料的介电性能与总盐含量呈线性关系。该研究有助于了解盐和盐含量对生牛乳介电特性的影响，并为今后基于介电特性的便携式盐分检测仪的研制提供参考。
To understand the effect of salts and salt contents on dielectric properties (dielectric constantε′ and dielectric loss factorε″) of milk, dielectric properties of raw cow's milk samples at the total salt content (in mass) of 0.75–0.87%, 0.75–0.93%, and 0.75–0.90% by adding NaCl, MgCl2, and KCl, respectively, were obtained from 19 to 3,000 MHz at 25 °C using an impedance analyzer. The results showed thatε′ decreased with increasing frequency, andε″ changed with “V” shape and had minimums at about 1,500 MHz. At a given frequency and the same salt addition level in molar, the milk added with NaCl and MgCl2had the smallest and the biggestε″, respectively. At about 40 MHz,ε′ had a very good positive linear relationship with the total salt content of milk, whose coefficients of determination were 0.96, 0.98, and 0.95 for NaCl, MgCl2, and KCl, respectively.ε″ increased linearly with increasing total salt contents with the coefficients of determination higher than 0.99 below about 900 MHz and higher than 0.86 above 900 MHz no matter for which salt.Practical applicationsThis work shows that there were linear relationships between dielectric properties and total salt contents. The study is helpful to understand the influence of salts and salt content on dielectric properties of raw cow's milk, and it offers useful information for developing portable salt detector based on dielectric properties in the future.
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