Industrial-scale radio frequency treatments for insect control in walnuts

Wang, S.; Monzón, Maria E.; Johnson, Judy; Mitcham, Elizabeth; Tang, Juming

doi:10.1016/j.postharvbio.2006.12.020

Cited by 157 publications

(93 citation statements)

References 20 publications

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“…This non-uniformity of temperature within the sample could be attributed to the unique behaviour of RF electrical field. Similar temperature distribution profiles within samples were reported earlier by Wang et al (2007) in the case of in-shell walnuts. In Wang et al (2007) work, the lowest temperature appeared at the bottom layer when the stacking started at the bottom electrode.…”

Section: Resultssupporting

confidence: 88%

“…Similar temperature distribution profiles within samples were reported earlier by Wang et al (2007) in the case of in-shell walnuts. In Wang et al (2007) work, the lowest temperature appeared at the bottom layer when the stacking started at the bottom electrode. When the distance between the top electrode and the top of the stack was equal to the distance between bottom electrode and the bottom stack then the temperature of the top stack was almost similar to that of the bottom stack.…”

Section: Resultssupporting

confidence: 88%

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Evaluation of heating uniformity in radio frequency heating systems using carrot and radish

Kong¹,

Zhang²,

Wang³

et al. 2016

International Agrophysics

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A b s t r a c t. Lack of heating uniformity is a major problem impeding the broader adaptation of radio frequency heaters in industrial applications. The overall aim of this study was to evaluate the uniformity of heating or temperature distribution within food samples (three different carrot and one radish rectangles) placed vertically and horizontally within a radio frequency heating cavity. The intensity of the electric field in radio frequency was found to be symmetrical. The temperatures at the vertically top positions were lower than the vertically bottom positions at the equidistance from the vertical center with the highest was at the vertically central position. The rate of temperature rise at all the positions were higher in taller (higher mass) than the shorter (lower mass) rectangles of carrots. The temperatures at the corners and edges were lower than at the cross sectionally central positions at all the heights tested in both carrots and radishes. The rate of temperature rise at all the vertical positions was higher in radish rectangles than in the carrot rectangles of the same dimensions. The similarity of temperature distribution in carrot and radish rectangles suggested that the heating patterns and uniformity in carrots and radishes in RF heating were almost the same.

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Section: Resultssupporting

confidence: 88%

Section: Resultssupporting

confidence: 88%

Evaluation of heating uniformity in radio frequency heating systems using carrot and radish

Kong¹,

Zhang²,

Wang³

et al. 2016

International Agrophysics

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show abstract

“…In general, RF is preferred to MW in controlling insects in stored products [16,17], and has been used at industrial scale for disinfestations of walnuts [18]. There is a need to investigate selective heating of one of the most troublesome insect pests, the Cryptolestes ferrungineus S., in the stored Canadian western red spring (CWRS) wheat, cv.…”

Section: Introductionmentioning

confidence: 99%

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

Shrestha

Yu²,

Baik³

2013

PIER

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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.

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“…Recientemente se ha estudiado la eficiencia como me´todos cuarentenarios de algunas tecnologı´as emergentes que han probado su eficiencia en la destruccio´n de microorganismos en alimentos. Las principales tecnologı´as estudiadas incluyen: campos de pulsos ele´ctricos (Hallman & Zhang, 1997), radiofrecuencia (Wang, Monzon, Johnson, Mitcham, & Tang, 2007), tratamiento te´rmico en agua asistido con radio frecuencia Sosa-Morales et al, 2009, Sosa-Morales, Valerio-Junco, Lo´pez-Malo, & Garcı´a, 2010Tiwari, Wang, Birla, & Tang, 2008), microondas (Varith, Sirikajornjaru, & Kiatsiriroat, 2007), y altas presiones hidrosta´ticas (APH) (Butz & Tauscher, 1995;CandelarioRodrı´guez et al, 2009;Neven, Follet, & Raghubeer, 2007).…”

Section: Introduccio´nunclassified

Efecto de las altas presiones hidrostáticas en la fisiología postcosecha del mango ‘Ataulfo’

Álvarez-Virrueta¹,

García-López²,

Montalvo‐González³

et al. 2012

CyTA - Journal of Food

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Industrial-scale radio frequency treatments for insect control in walnuts

Cited by 157 publications

References 20 publications

Evaluation of heating uniformity in radio frequency heating systems using carrot and radish

Evaluation of heating uniformity in radio frequency heating systems using carrot and radish

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

Efecto de las altas presiones hidrostáticas en la fisiología postcosecha del mango ‘Ataulfo’

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