Moisture content and bulk density dependence of dielectric properties of safflower seed in the radio frequency range

Saçılık, Kamil; Tarımcı, Çelik; Çolak, Ahmėt

doi:10.1016/j.jfoodeng.2005.12.022

Cited by 50 publications

(20 citation statements)

References 24 publications

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“…Table 3 shows the dielectric properties of canola seeds are higher than other oil seeds in accordance with the same reason at different MCs, 23-30°C, and 10 MHz. [1,[29][30][31][32] The dielectric properties of various oil seeds were obtained from the published works [29,31,33] to compare with the measured dielectric properties of bulk canola seeds, which were indicated in Table 3. As shown in Table 3, the range of total oil content was 38.4 to 49.7% except for soy bean (6.8%).…”

Section: Effect Of Linolenic Acidmentioning

confidence: 99%

Radio Frequency Dielectric Properties of Bulk Canola Seeds under Different Temperatures, Moisture Contents, and Frequencies for Feasibility of Radio Frequency Disinfestation

Yu¹,

Shrestha²,

Baik³

2015

International Journal of Food Properties

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The parallel capacitances and resistances of the bulk canola seeds were measured to determine the dielectric properties of canola seeds using a radio frequency dielectric fixture at different levels of temperature (30-80°C) and moisture content (5-11% w.b.), over the frequency range of 5 to 30 MHz. The dielectric constant (ε′) increased from 3.82 to 7.85 with increasing temperature and decreasing frequency regardless of the seed moisture contents. The dielectric loss factors (ε") of the bulk seeds increased with increasing temperature and moisture content and decreased with frequency, ranging between 0.11 and 13.0. The penetration depth of the electromagnetic power in the bulk seeds varied from 1.30 to 48.0 m depending upon temperature, frequency, and moisture content. The distinct correlation of sensitivity of dielectric properties with moisture content was not observed except for that of penetration depth. The dielectric properties of the bulk canola seeds were higher than those of other oil seeds at various moisture contents; it might be affected by relatively higher linolenic acid content among other fatty acids. The large difference of the dielectric loss factors of insect pests cf. those of canola seeds showed potential for radio frequency disinfestation based on selective heating of insect pests in the canola seeds. The dielectric properties determined can be used for simulating temperature distribution within the bulk canola seeds during the radio frequency process.

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Section: Effect Of Linolenic Acidmentioning

confidence: 99%

Radio Frequency Dielectric Properties of Bulk Canola Seeds under Different Temperatures, Moisture Contents, and Frequencies for Feasibility of Radio Frequency Disinfestation

Yu¹,

Shrestha²,

Baik³

2015

International Journal of Food Properties

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“…Calay et al (1995), Nelson (2003) The ε′ increased with an increase in the moisture content and bulk density, whereas it decreased with an increase in the frequency. Sacilik et al (2007) Fresh eggs Freq. (10-1800 MHz) at 24°C temperature The ε′ increases with temperature, whereas ε″ increased with increasing temperature and ε′ increased with temperature at lower frequencies, but decreased with temperature at the higher frequencies.…”

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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“…Inúmeros trabalhos têm sido realizados com o objetivo de analisar a secagem de sementes de diversas oleaginosas como, por exemplo: pinhão manso (GOLDFARB et al, 2008;PRADHAN et al, 2009;SIRISOMBOON;KITCHAIYA, 2009);canola (CORRÊA et al, 1999); soja (BARROZO et al, 2006;MIRANDA et al, 1999); avelã (OZDEMIR; DEVRES, 1999); girassol (SACILIK et al, 2007); amendoim (CORRÊA et al, 2007) e mamona (GONELI, 2008).…”

Section: Introductionunclassified

Qualidade das sementes de pinhão manso submetidas à secagem artificial

Ullmann¹,

Resende²,

Sales³

et al. 2010

Rev. Ciênc. Agron.

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Resumo -Na fase de pós-colheita do pinhão manso a secagem é o processo mais utilizado para assegurar sua qualidade e estabilidade. Assim, objetivou-se no presente trabalho analisar a secagem das sementes de pinhão manso, bem como verificar o efeito das diversas condições de ar na qualidade do produto, por meio das análises de condutividade elétrica, absorção de água, porcentagem de germinação e índice de velocidade de germinação (IVG). A secagem foi realizada em secador experimental testando as temperaturas de 30; 40; 50; 60 e 70 °C, em delineamento inteiramente casualizado, com quatro repetições. Verificou-se que o aumento da temperatura do ar de secagem aumenta os danos nas sementes de pinhão manso, porém não interfere na absorção de água do produto. Já a germinação se mateve elevada, mesmo na temperatura de secagem mais alta, apresentando valores acima de 91% e o IVG não apresentou diferenças estatísticas. Portanto, conclui-se que a qualidade fisiológica das sementes de pinhão manso é afetada pela temperatura de secagem.Palavras-chave -Pinhão. Plantas-desidratação. Sementes-qualidade. Germinação. Abstract -The post-harvest drying of jatropha is the most frequently used process to ensure quality and stability. The aim of this work was to analyze the seed drying of jatropha and check the effect of air conditions on seed quality, through electrical conductivity, water absorption germination test and index of germination velocity (IGV). Drying was done in an experimental drier, testing controlled temperatures of 30; 40; 50; 60 and 70 °C, in a randomized design with four replications. It was found that increasing the temperature of the drying air increases the damage on the seeds of jatropha, but does not interfere with water absorption of the product. The germination is high even at the highest drying temperature, with values above 91% and IVG did not show statistical differences. Therefore, it was concluded that the physiological quality of seeds of Jatropha curcas is affected by drying temperature.

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Moisture content and bulk density dependence of dielectric properties of safflower seed in the radio frequency range

Cited by 50 publications

References 24 publications

Radio Frequency Dielectric Properties of Bulk Canola Seeds under Different Temperatures, Moisture Contents, and Frequencies for Feasibility of Radio Frequency Disinfestation

Radio Frequency Dielectric Properties of Bulk Canola Seeds under Different Temperatures, Moisture Contents, and Frequencies for Feasibility of Radio Frequency Disinfestation

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

Qualidade das sementes de pinhão manso submetidas à secagem artificial

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