Dielectric Properties of Apple Cultivars and Codling Moth Larvae

Ikediala, J.N.; Tang, Juming; Drake, S. R.; Neven, Lisa

doi:10.13031/2013.3010

Cited by 84 publications

(48 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

“…The technique is not suitable for determining permittivities of granular and pulverized samples when bulk densities of such samples were established by auxiliary permittivity measurements. This method is convenient, relatively easy to use because of its ability to scan through a wide range of frequencies with desired accuracy and little or no sample preparation (Feng et al 2002;Ikediala et al 2000;Nelson 2003;Venkatesh and Raghavan 2004;Wang et al 2003Wang et al , 2005.…”

Section: Open Ended Coaxial Probe Techniquementioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2011

View full text Add to dashboard Cite

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 ...

show abstract

Section: Factors Affecting the Dielectric Propertiesmentioning

confidence: 99%

Section: Open Ended Coaxial Probe Techniquementioning

confidence: 99%

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

et al. 2011

View full text Add to dashboard Cite

show abstract

“…The ε of the insect-slurries might be quite different from that of the live insects due to the insects' cuticles, size, and shapes. For example, the ε at 100 MHz increased by about 30% comparing to the live ones when the measurements were done on slurry of the fifth instar whole codling moth larvae infesting apples [11]. It showed a higher RF sensitivity to the exposed ionic contents of material, and the importance of considering the whole insects for RF disinfestation.…”

Section: Introductionmentioning

confidence: 97%

Elimination of Cruptolestes Ferrungineus S. In Wheat by Radio Frequency Dielectric Heating at Different Moisture Contents

Shrestha

Yu²,

Baik³

2013

PIER

View full text Add to dashboard Cite

Abstract-Radio frequency (RF) dielectric heating was tested to control Cryptolestes ferrungineus S. in the bulk wheat samples (ca.152 g, dia. = 50 mm, ht. = 100 mm) at the MCs (%, w. b.) of 12, 15, and 18 using a pilot-scale RF heater (1.5 kW, 27.12 MHz) in the batch mode. When the temperature of the hottest spot (geometric center) of the sample, T H was at 80 • C, all the adult insects were found dead at the cold spots, near bottom-wall, at 50.7 to 56.0 • C depending up on the wheat MCs. The temperatures of the insectslurries higher than that of the bulk wheat by 0.8 to 15.1 • C indicated the selective heating of the insects. The mortalities of adult insects were almost constant within the quarantine period, QP1 (5 wk). The elapsed time during QP1 had a significant effect only on the insects' mortalities with the wheat at 12% MC. The wheat MC had only marginal significance on the absolute mortalities of insects. The larvae were completely destroyed at temperatures between 55 and 60 • C. The complete mortality of all life stages (eggs, larvae, pupae, and adults) of the insect was achieved at T H = 80 • C without any emergence of the insects during QP2 (8 wk). The RF treatment enhanced the germination of the wheat kernels at 12% MC while it was decreased by 2 to 33% depending up on the wheat MC, and the treatment temperature. Temperature had no significant effect on the falling numbers, and the yields of flour, bran, and shorts, and the peak bandwidth and the MC of the wheat, and the flour protein values. The means of the mixing-development-time deferred from the controls mostly for the wheat at 15% MC and T H = 70 • C, and 18% MC and T H = 70 and 80 • C. The mean-peakheight and the color values varied between 4 and 16%, and 3 and 6% off the controls depending up on the temperatures. The uniform temperature of 60 • C should be enough 518Shrestha, Yu, and Baik to control all life stages of the insect completely with a little or no changes in the important product qualities and germination of the wheat at MCs safe for the storage. Future research mainly focused on better estimation of the insect-to-grain electric field intensities is essential.

show abstract

“…The dielectric loss factors of nuts' pests are much higher than those of the nuts illustrated in Fig.3 (Wang & Tang, 2001). Within a 3 minutes of treatment, the Codling moth, which infests the walnuts, is killed due to the high absorption of energy compared to the walnut (Ikediala et al, 2000). On the other hand, the shell and the air inside it act as an insulator and protect the walnut from convectional heating, while the electromagnetic wave selects the victim inside the walnut to transfer the energy.…”

Section: Walnuts Treatment In Ism Bandmentioning

confidence: 99%