Dielectric Characteristics of Grape Juice and Wine

García, Arantza; Torres, José Luis; Blas, M. De; Francisco, Alícia de; Illanes, R.

doi:10.1016/j.biosystemseng.2004.04.008

Cited by 46 publications

(32 citation statements)

References 4 publications

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“…Dielectric properties as related to temperature and frequencies have been reported for different agricultural commodities, including grains and seeds (Nelson 1965), fruits and vegetables (Feng et al 2002;Guan et al 2004;Ikediala et al 2000;Nelson 1983;Nelson et al 1994;Wang et al 2003), juice and wine (Garcia et al 2004), baked foods and flours (Kim et al 1998;Zuercher et al 1990), dairy products (Green 1997;Herve et al 1998), fish and meat Lyng et al 2005), egg white solutions and thermal denatured egg albumen gels (Lu et al 1998). Studies were also reported that assessed possibility of non-destructively predicting some physical characteristics of agri-food products such as fruits and eggs (Nelson et al 1995;Dev et al 2008).…”

Section: Factors Affecting the Dielectric Propertiesmentioning

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: Factors Affecting the Dielectric Propertiesmentioning

confidence: 99%

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

et al. 2011

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“…For example, Garcia et al (2004) examined the complex dielectric permittivity of a grape juice and wine for frequencies from 0.2 to 3 GHz using a coaxial open-ended probe. It was found that the dielectric properties of those liquids allow for their identification.…”

Section: Dielectric Properties Of Liquid Materials Of Agricultural Ormentioning

confidence: 99%

Dielectric spectroscopy in agrophysics

Skierucha¹,

Wilczek²,

Szypłowska³

2012

International Agrophysics

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A b s t r a c t. The paper presents scientific foundation and some examples of agrophysical applications of dielectric spectroscopy techniques. The aim of agrophysics is to apply physical methods and techniques for studies of materials and processes which occur in agriculture. Dielectric spectroscopy, which describes the dielectric properties of a sample as a function of frequency, may be successfully used for examinations of properties of various materials. Possible test materials may include agrophysical objects such as soil, fruit, vegetables, intermediate and final products of the food industry, grain, oils, etc. Dielectric spectroscopy techniques enable non-destructive and non-invasive measurements of the agricultural materials, therefore providing tools for rapid evaluation of their water content and quality. There is a limited number of research in the field of dielectric spectroscopy of agricultural objects, which is caused by the relatively high cost of the respective measurement equipment. With the fast development of modern technology, especially in high frequency applications, dielectric spectroscopy has great potential of expansion in agrophysics, both in cognitive and utilitarian aspects.K e y w o r d s: agrophysics, dielectric spectroscopy, food quality INTRODUCTIONAgrophysics is a specialized scientific field derived from the branch of the agricultural sciences (Micha³ek, 2006). Its aim is to apply physical methods for studies of properties of materials and processes occurring in production and processing of crops and food of agricultural origin. Dielectric properties of all materials existing in Nature are dependent on their molecular structure. Specifically, they depend on the distribution of electric charges, which are either constantly embedded within the molecules or become temporarily induced on their surfaces. It is also known that the molecular structure of objects determine their physical and chemical properties. Therefore, one may suppose that the dielectric properties of mixtures of various molecules constituting a given material will uniquely identify it. It means that dielectric properties can successfully diversify physical and chemical properties of a tested material. This idea is presented in Fig. 1. The crucial point of the application of the dielectric spectroscopy measurement techniques in agrophysics is the utilization of their advantages for rapid and non-destructive assessment of the quality of the agricultural objects. It may be done by searching for dependencies between the dielectric properties and other physical and chemical properties of tested materials of agricultural origin.Behaviour of any material in the electric field is unique, because of the unique molecular structure of each material. On the other hand, physical and chemical properties of materials determine their quality, which in the case of food products is closely related to their commercial and nutritional value. Therefore, it is reasonable to assume that the dielectric properties, uniquely describing each...

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“…Just as the quality of a food product can be determined from many factors, like its density, color, or fluidity, the value of the complex dielectric permittivity in function of frequency is also used to characterize some qualities from different products. García and Torres in [5] calculate the dielectric permittivity of wine within a frequency range between 200 MHz and 3 GHz by using an open-ended coaxial probe, and Jan and David Vrba in [6] studied the complex dielectric permittivity of sunflower oil and olive oil.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Complex Dielectric Permittivity in Oils from High-Voltage Transformes Using a Coaxial Probe

Bermudez

Rico

2016

TECCIENCIA

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This work presents the results obtained in the measurement of complex dielectric permittivity of some samples of oil from high voltage transformers within a frequency range comprised between 100 MHz and 3 GHz. Three types of oil samples were considered: new, used and those used samples that have undergone a filtering process for their recovery and new use. The measurements were performed by using a low-cost probe adapted from an open-ended SMA coaxial connector. The values obtained in a vector network analyzer of the reflection coefficient, measured on the contact surface between the probe and the oil are used to calculate the real and imaginary part of the complex dielectric permittivity by using theoretical models of the cable's open end. The results obtained permit assigning trust to this measurement and characterization method of the oils according to the value of the complex dielectric permittivity, given that it agrees with some values reported in the literature obtained through different methods. ResumenEste trabajo presenta los resultados obtenidos en la medición de la permitividad dieléctrica compleja de algunas muestras de aceite de transformadores de alta tensión en un rango de frecuencias comprendido entre 100 MHz y 3GHz. Se tienen en cuenta tres tipos de muestras de aceite: nuevas, usadas y aquellas muestras usadas a las que se les ha realizado un proceso de filtración para su recuperación y nuevo uso. Las mediciones son realizadas utilizando una sonda de bajo costo adaptada a partir de un conector coaxial SMA con terminación abierta. Los valores obtenidos en un analizador de redes vectorial VNA del coeficiente de reflexión, medido en la superficie de contacto entre la sonda y el aceite, son usados para calcular la parte real e imaginaria de la permitividad dieléctrica compleja mediante el uso de modelos teóricos de la terminal abierta del cable. Los resultados obtenidos permiten dar confianza en este método de medición y caracterización de los aceites de acuerdo al valor de la permitividad dieléctrica compleja, ya que concuerdan con algunos valores reportados en la literatura obtenidos por métodos diferentes.

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Dielectric Characteristics of Grape Juice and Wine

Cited by 46 publications

References 4 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 spectroscopy in agrophysics

Measurement of Complex Dielectric Permittivity in Oils from High-Voltage Transformes Using a Coaxial Probe

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