Dielectric properties of thermosonically treated Agaricus bisporus slices during microwave vacuum drying and correlation with the water state
Dielectric properties of thermosonically treated Agaricus bisporus slices during microwave vacuum drying and correlation with the water state
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DOI：
10.1080/07373937.2019.1580717
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发表时间：
2020-03
影响因子：
3.3
通讯作者：
Ning Jiang;Camel Lagnika;Chunquan Liu;Dajing Li;Zhi-fang Yu;Libin Wang;Zhongyuan Zhang;Chunju Liu;Ya-dong Xiao;M. Zhang
中科院分区：
文献类型：
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作者：
Ning Jiang;Camel Lagnika;Chunquan Liu;Dajing Li;Zhi-fang Yu;Libin Wang;Zhongyuan Zhang;Chunju Liu;Ya-dong Xiao;M. Zhang
摘要利用网络分析仪和同轴探针在微波频率（915和2450 MHz）下测定了双孢蘑菇片经热超声处理后在微波真空干燥过程中的介电特性。在25 °C下的介电常数也与通过低场核磁共振（LF-NMR）分析确定的水状态相关。结果表明，A.样品中水分状态的组成对双孢切片的影响显著。在微波真空干燥过程中，热超声预处理增强了半结合水（M22）和结合水（M21）对切片结晶度的影响。在915和2450 MHz频率下，研究了热超声处理的A.双孢蘑菇样品的遗传行为可用三次多项式模型描述，R2大于0.998。红外热像分析表明，热超声预处理是一种很有潜力的提高A。在MVD过程中，
Abstract The dielectric properties of thermosonically treated Agaricus bisporus slices during microwave vacuum drying were determined, by using a network analyzer and an open-ended coaxial-line probe at microwave frequency (915 and 2450 MHz). The permittivity at 25 °C was also correlated to the water state determined by low field nuclear magnetic resonance (LF-NMR) analysis. Results showed that the dielectric constant ε' and loss factor ε″ of A. bisporus slices were affected significantly by the composition of water state in the sample. Thermosonic pretreatment enhanced the influence of semi-bound water (M22) and bound water (M21) on the permittivities in sample slices during microwave vacuum drying (MVD). The dependency of permittivities on the moisture content and temperature at 915 and 2450 MHz for thermosonically treated A. bisporus samples could be described by third-degree polynomial models, with R2 higher than 0.998. Infrared thermal imaging analysis confirmed that thermosonic pretreatment is a potential technology to promote the uniformity of A. bisporus slices during the MVD process.