吴其飞,王力坤,陈中伟,徐斌.微波频率、含水率与无机盐对小麦胚芽介电特性的影响[J].农业机械学报,2016,47(5):225-230.
Wu Qifei,Wang Likun,Chen Zhongwei,Xu Bin.Effect of Microwave Frequency, Water and Inorganic Salts on Dielectric Properties of Wheat Germ[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(5):225-230.
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微波频率、含水率与无机盐对小麦胚芽介电特性的影响   [下载全文]
Effect of Microwave Frequency, Water and Inorganic Salts on Dielectric Properties of Wheat Germ   [Download Pdf][in English]
投稿时间:2015-11-13  
DOI:10.6041/j.issn.1000-1298.2016.05.031
中文关键词:  小麦胚芽  介电特性  无机盐  微波频率  含水率
基金项目:国家自然科学基金项目(31371877)、中国博士后基金特别资助项目(2013T60510)、江苏省博士后基金项目(1202070C)和江苏大学高级人才基金项目(12JDG055)
作者单位
吴其飞 江苏大学 
王力坤 江苏大学 
陈中伟 江苏大学 
徐斌 江苏大学 
中文摘要:为探明微波稳定麦胚的机制,以小麦胚芽为研究对象,研究了不同测量频率、含水率、脂肪含量及添加不同无机盐条件下麦胚粉体的介电特性(介电常数ε′和介电损耗因数ε″)。实验结果表明,在2个常用微波频率下,小麦胚芽ε′在频率为915MHz时略大于2450MHz时,但ε″在2450MHz时明显大于915MHz时;小麦胚芽介电特性随含水率的增加而增大,当其含水率从4%增至16%时,其ε′和ε″分别从2.61和0.02升高至4.32和0.8;不同脂肪含量的小麦胚芽的介电特性相差较小,尤其是ε″;对比添加5种无机盐后小麦胚芽介电特性发现,NaCl对其ε′和ε″有明显增加作用,尤其是当NaCl的质量分数为1%时,效果最明显。
Wu Qifei  Wang Likun  Chen Zhongwei  Xu Bin
Jiangsu University,Jiangsu University,Jiangsu University and Jiangsu University
Key Words:wheat germ  dielectric properties  inorganic salts  microwave frequency  water content
Abstract:Microwave can stabilize the quality of wheat germ rapidly and uniformly with the advantages of losing nutrition minimally. To investigate the mechanism of microwave on the stability of wheat germ, the dielectric properties (ε′ and ε″) of wheat germ were studied under different frequencies, water contents, fat contents and salts, including sodium, potassium, magnesium, calcium and iron ion. The results showed that, when the frequency was 915MHz, ε′ is slightly higher than that at 2450MHz, while ε″ was less than that at 2450MHz significantly. When water content is 16%, with frequency changes from 915MHz to 2450MHz, ε′ was decreased from 4.91 to 4.32, and ε″ was increased from 0.33 to 0.80. As water content of wheat germ increasing, the dielectric properties of wheat germ were increased significantly. When the water content was increased from 4% to 16%, the ε′ was increased from 2.61 to 4.32, and ε″ increased from 0.02 and 0.8, respectively. Fat content had little effect on the dielectric properties of wheat germ, particularly has no effect on ε″. Among the five salts, adding NaCl can increase ε′ and ε″ of wheat germ. Especially when NaCl concentration was 1%, ε′ was increased slightly while ε″ was increased apparently from 0.8 to 1.3, which can enhance enzyme inactivation effect of microwave.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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