Dielectric relaxation time and structure of bound water in biological materials

Mashimo, Satoru; Kuwabara, Shinichi; Yagihara, Shin; Higasi, Keniti

doi:10.1021/j100309a005

Cited by 177 publications

(134 citation statements)

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“…The sample size used is very small and the substance to be measured must be homogeneous. Although these methods are expensive, they are excellent tools for advanced research on the interaction of the electromagnetic energy and materials over a wide frequency range (Mashimo et al 1987;Ohlsson et al 1974b). The dielectric properties of honey-water mixture have been investigated and tabulated using this technique in the frequency range of 10 MHz to 10 GHz at 25°C by Puranik et al (1991).…”

Section: Time Domain Spectroscopy /Reflectometry (Tdr) Methodsmentioning

confidence: 99%

Measurement techniques and application of electrical properties for nondestructive quality evaluation of foods—a review

et al. 2011

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Non-destructive systems are recent trends for quality evaluation of fruits and vegetables. Information on post-harvest variations in electrical properties is needed to develop new instruments for this purpose. Electrical properties are finding increasing application in agriculture and food processing industries. Knowledge of dielectric properties of foods as a function of moisture content and temperature is essential in the design and control of drying systems. As simple, rapid and non-destructive measuring techniques, dielectric spectroscopy provides information about the dielectric response of materials to electromagnetic field. Electrical properties of agricultural materials have been of interest for many years. The interest in dielectric properties of materials has historically been associated with the design of electrical equipment. This review paper covers theoretical aspects of different electrical properties, their measurement techniques, applications of dielectric properties in agriculture/food processing sector and potential applications of thermal imaging (TI) for quality and safety assessment in food processing. The values of dielectric properties of a number of products including food grains, fruits and vegetables, and meat and meat products are presented in table form. This comprehensive coverage will be useful for academic, scientific and industrial community in treating and applying the facts in developing/testing new processes and products based on electromagnetic energy application.Keywords Electrical properties . Non-destructive . Measuring techniques . Dielectric constant . Loss factor . Thermal imaging technique . Food quality evaluationThe material investigation and moisture measurement using electromagnetic waves in wide spectrum serve for quality control and improvement in many branches like industry, forest and wood-working industry, civil engineering, agriculture, commerce and also foods e.g. for quality evaluation of meat, fruits, coffee etc (Hlavacova 2003; Venkatesh and Raghavan 2004). Non-destructive evaluation of quality based on constituents of fruits and vegetables has been successfully used (Chen et al. 1999;Jha et al. 2001;Kawano 1998). Electrical characteristics of agricultural materials have been of interest for many years (Nelson 2006) and are utilized in many areas of human activities. Techniques for non-destructive determination of quality and related characteristics of agricultural products are helpful to producers, handlers and processors . Permittivity and moisture can be closely correlated when water content is high. Knowledge of dielectric properties in partially frozen material is critical in determining the rates and uniformity of heating in microwave thawing. Electrical properties are important in processing foods with pulsed electric fields, ohmic heating, induction heating, radio frequency, and microwave heating. These properties are also useful in the detection of processing conditions or the quality of foods (Barbosa-Canovas et al. 2006). Considering ...

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Section: Time Domain Spectroscopy /Reflectometry (Tdr) Methodsmentioning

confidence: 99%

Measurement techniques and application of electrical properties for nondestructive quality evaluation of foods—a review

et al. 2011

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“…In particular, it was established by this way that water within porous disperse systems is characterized by specific properties differing from the properties of ordinary free water (socalled bound water) [5][6][7][8][9][10][11]. It is known that near a solid surface or close to a polymeric macromolecule, water forms the ice-like cluster structure [7,10,12].…”

Section: Introductionmentioning

confidence: 99%

“…Some researchers regard that the boundary values of its local density and dielectric permittivity in the monomolecular interface layer are identical to the properties of ice [9,10]. Other authors indicate on differences between these water phases [6,8], pointing out in particular to the existence of the Debye relaxation frequency for bound water near 100 MHz [8], whereas the similar frequency for ice is about 10 kHz [13,14]. Probably, the following point of view is correct according to which the properties of bound water are not the same for different heterogeneous systems and are dependent on their composition.…”

Section: Introductionmentioning

confidence: 99%

Dielectric Study of Bound Water in Grain at Radio and Microwave Frequencies

Serdyuk

2008

PIER

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Abstract-A phenomenological theoretical model of grain dielectric properties is presented for radio and microwave frequencies. On the bases of this model, an inverse problem is solved to determine the dielectric permittivity of bound water inside kernels of winter wheat using results of complex permittivity measurements for bulk grain carried out by other authors. The character of the water complex permittivity dependence on frequency and kernel moisture content is studied. For this, the permittivity was considered as a sum of five different functions, depending on moisture content explicitly, and with coefficients being subject to determination. The frequency dependence of these coefficients was analyzed, and the regions typical for the ionic conductivity and for the dipole-orientational polarization mechanism were detected. For this polarization mechanism, the relaxation frequencies are differ from those of free water. It was concluded that water microparticles inside kernels are formed not by pure water, but by aqueous solution of four different substances coming from the kernel solid phase. It is shown that bound water, for the most part, is in a state that is intermediate between that of free water and that of molecules in the monomolecular water layer on the solid phase boundary.

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“…Mashimo et al [27] have used the two-term Debye function expressed in Eq. (16) The results obtained from above were well fit for a frequency range of 10 MHz to 10GHz.…”

Section: Results Of Dielectric Measurements For Skinmentioning

confidence: 99%

A Comprehensive Review on Design and Development of Human Breast Phantoms for Ultra-Wide Band Breast Cancer Imaging Systems

Khuda¹

2017

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Abstract. Microwave ultra-wide band UWB imaging system is a contemporary biomedical imaging technology for early detection of breast cancers. This imaging system requires the development of breast phantoms for experimental data analysis. In order to obtain realistic results, it is very important that these phantoms mimic the characteristics of real biological breast tissue as close as possible. For this purpose, scientists and engineers make use of the dielectric properties of human breast. This paper takes a survey of mathematical formulations used to determine biological dielectric properties and then takes a review of current breast phantoms being used in UWB imaging systems with reference to the analytical dielectric measurements.At present, breast phantoms are made, both, manually in laboratory utilizing different chemicals and also by using computational electromagnetic algorithms to introduce better heterogeneity in them. They can then easily be tested by doing computer simulations. In this review paper, emphasis is made on the phantoms which are made in laboratory for doing hardware experimentations.

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Dielectric relaxation time and structure of bound water in biological materials

Cited by 177 publications

References 0 publications

Measurement techniques and application of electrical properties for nondestructive quality evaluation of foods—a review

Measurement techniques and application of electrical properties for nondestructive quality evaluation of foods—a review

Dielectric Study of Bound Water in Grain at Radio and Microwave Frequencies

A Comprehensive Review on Design and Development of Human Breast Phantoms for Ultra-Wide Band Breast Cancer Imaging Systems

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