Study of dielectric properties of adulterated milk concentration and freshness

International Conference on Materials, Alloys and Experimental Mechanics 2017

材料科学;金属学;机械制造

Jitendra Murthy, V.^1 ; Sai Kiranmai, N.^1 ; Kumar, Sanjeev^2

Narasimha Reddy Engineering College, Maisamma Guda, Secunderabad, India^1

Department of Physics, Nova College of Engineering and Technology, Telengana, India^2

关键词: Electrical conductivity;    hippel technique;    Loss factor;    Milk concentration;    Open-ended coaxial-line probe;    Quality evaluation;    Radio frequencies;    Storage time;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/225/1/012285/pdf
DOI  :  10.1088/1757-899X/225/1/012285

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The knowledge of dielectric properties may hold a potential to develop a new technique for quality evaluation of milk. The dielectric properties of water diluted cow's milk with milk concentration from 70 percent to 100 percent stored during 36hour storage at 22°C and 144 hour at 5°C were measured at room temperature for frequencies ranging from 10 to 4500 MHz and at low, high & at microwave frequencies using X band bench and open-ended coaxial-line probe technology, along with electrical conductivity. The raw milk had the lowest dielectric constant (′) when the frequency was higher than about 20M.Hz, and had the highest loss (″) or decepation factor tan (δ) at each frequency. The penetration depth (dp) increased with decreasing frequency, water content and storage time, which was large enough to detect dielectric properties changes in milk samples and provide large scale RF pasteurization processes. The loss factor can be an indicator in predicting milk concentration and freshness.