A New Method for the Control of Moisture and Insect Infestations of Grain by Microwave Power<sup>*</sup>

Hamid, M.; Boulanger, R. J.

doi:10.1080/00222739.1969.11688696

Cited by 30 publications

(11 citation statements)

References 1 publication

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“…Microwave radiation is also effective against stored product pests and it can be used in grain drying process as well [3] but probability if overheating of grain is very high. When grain temperature reaches 55 8C or higher the loaf volume of bread baked from irradiated flour is reduced [7]. However the range of damage depends on dosage and time of treatment.…”

Section: Resultsmentioning

confidence: 99%

The effect of gamma and microwave irradiation of wheat grain on development parameters of some stored grain pests

Warchalewski¹,

̃dzynska²,

Gralik³

et al. 2000

Nahrung

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Wheat grain was treated with different doses of gamma irradiation or different times of microwaves. Gamma rays (0.05-10 kGy) caused statistically significant differences in soluble protein contents and kernel hardness. Microwave treatment (15-180 s) resulted in some statistically significant changes in moisture and soluble protein contents. Mortality, intensity of feeding, fertility of adults, progeny number and development time of larvae of the granary weevil (Sitophilus granarius L.) on treated grain were observed. On the basis of progeny number and larval development time the coefficient of food value (CFV) was calculated. Some statistical differences were stated in studied parameters, however no one in all calculated coefficients of food values. The same treated grain was also used as a food for larvae of the confused flour beetle (Tribolium confusum Duv.) and Mediterranean flour moth (Ephestia kuehniella Zell.). Mortality of larvae and their development time were studied. Only gamma irradiated wheat grain at the dose 0.1 kGy used as a food for larvae of T. confusum Duv. caused statistically significant extension of development time by 7 days, when comparing to the control food. On the other hand, microwave treatment of wheat grain used as food significantly shorten the development time of larvae in both species.

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Section: Resultsmentioning

confidence: 99%

The effect of gamma and microwave irradiation of wheat grain on development parameters of some stored grain pests

Warchalewski¹,

̃dzynska²,

Gralik³

et al. 2000

Nahrung

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“…The non-uniformity of heating was investigated for wheat and barley at four moisture contents (12,15,18, and 21% wet basis) and for canola at five moisture contents (8,12,15,18, and 21% wet basis). Microwave treatment was given to the grain at five power levels (100, 200, 300, 400, and 500 W) and two exposure times (28 and 56 s).…”

Section: Methodsmentioning

confidence: 99%

“…The mortality of T. confusum was 70% at 55 C and 100% at 65 C when microwaves were used for disinfestations. [15] While using an industrial microwave system (2.45 GHz), Vadivambal et al [16] obtained 45, 58, 85, and 100% mortality for T. castaneum (Herbst) at 250, 300, 400, and 500 W, respectively.…”

Section: Introductionmentioning

confidence: 98%

Non-Uniformity of Surface Temperatures of Grain after Microwave Treatment in an Industrial Microwave Dryer

2006

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In this study, temperature rise and non-uniformity of heating of grain with different moisture contents after microwave treatment were investigated. The temperature anomalies after microwave treatment were measured for barley and wheat at four moisture levels (12, 15, 18, and 21% wet basis) and for canola at five moisture levels (8, 12, 15, 18, and 21% wet basis). Fifty grams of grain samples were heated in a laboratory scale, continuous-type, industrial microwave dryer (2450 MHz) at five power levels (100, 200, 300, 400, and 500 W) and two exposure times (28 and 56 s). Grain samples were thermally imaged using an infrared thermal camera as soon as they came out from the microwave chamber. Average, maximum, and minimum temperatures were extracted from each thermal image and the difference between maximum and minimum temperatures (DT) was calculated. The grain type had significant effect on the surface temperatures after microwave treatment. The surface temperatures increased with microwave powers and exposure times but decreased with moisture content. The average surface temperatures after microwave treatment were between 72.5 and 117.5 C, 65.9 and 97.5 C, and 73.4 and 108.8 C for barley, canola and wheat, respectively, when the applied microwave power was 500 W. At the same power level, the maximum surface temperature was between 100.3 and 140.0 C, 77.8 and 117.7 C, and 98.3 and 130.9 C for barley, canola, and wheat, respectively. Nonuniform heating patterns were observed for all three grain types at all moisture contents, power levels, and exposure times. The DT was in the range of 7.2 to 78.9 C, 3.4 to 59.2 C, and 9.7 to 72.8 C for barley, canola, and wheat, respectively. The location of hot and cold spots may vary in different dryers based on the position of magnetron and other components, but almost similar non-uniform heating pattern is expected in all microwave dryers. Therefore, this non-uniformity must be taken into consideration while developing microwave processing systems for grains.

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“…Electro‐physical treatment methods , first and foremost treatments with microwaves (MW), have also been listed as special treatment methods for insect control. Nevertheless, in the course of fine‐tuning the standard, a considerable need for reliable data and documented experimental studies when applying MW heating has been expressed.…”

Section: Introductionmentioning

confidence: 99%

Chemical‐Free Pest Control by Dielectric Heating with Radio Waves and Microwaves: Thermal Effects

et al. 2017

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Thermal pest control with hot air is widely accepted as an alternative to chemical methods. However, it requires relatively long treatment times owing to the low thermal conductivity of wood. Direct dielectric heating that applies radio waves or microwaves has the advantage of more homogeneous heating. However, sound experimental data on this technique are currently rare. Therefore, the thermal treatment of wood-destroying insects with radio waves and microwaves was studied with two model pests, Anobium punctatum and Hylotrupes bajulus, and with Tenebrio molitor as a reference. The secure elimination of pests was achieved, and the corresponding treatment time was in the range of a few minutes. Temperature profiles were more homogeneous when applying radio waves.

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A New Method for the Control of Moisture and Insect Infestations of Grain by Microwave Power^*

Cited by 30 publications

References 1 publication

The effect of gamma and microwave irradiation of wheat grain on development parameters of some stored grain pests

The effect of gamma and microwave irradiation of wheat grain on development parameters of some stored grain pests

Non-Uniformity of Surface Temperatures of Grain after Microwave Treatment in an Industrial Microwave Dryer

Chemical‐Free Pest Control by Dielectric Heating with Radio Waves and Microwaves: Thermal Effects

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A New Method for the Control of Moisture and Insect Infestations of Grain by Microwave Power*

Cited by 30 publications

References 1 publication

The effect of gamma and microwave irradiation of wheat grain on development parameters of some stored grain pests

The effect of gamma and microwave irradiation of wheat grain on development parameters of some stored grain pests

Non-Uniformity of Surface Temperatures of Grain after Microwave Treatment in an Industrial Microwave Dryer

Chemical‐Free Pest Control by Dielectric Heating with Radio Waves and Microwaves: Thermal Effects

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A New Method for the Control of Moisture and Insect Infestations of Grain by Microwave Power^*