Radio frequency heating of corn flour: Heating rate and uniformity

Ozturk, Samet; Kong, Fanbin; Singh, Rakesh K.; Kuzy, Jesse Daniel; Li, Changying

doi:10.1016/j.ifset.2017.05.001

Cited by 76 publications

(22 citation statements)

References 37 publications

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“…Therefore, improvement of heating non‐uniformity is on the grounds of mixing, intermittent stirrings, conveyor belt movement, hot‐air flux, inclosing material and electrode gap . However, characterization of heating non‐uniformity is still an issue for pasteurizing food . Using infrared photography technology, we acquired more information on hot‐spot and cold‐spot concerning heating non‐uniformity.…”

Section: Introductionmentioning

confidence: 99%

Radiofrequency heating for powder pasteurization of barley grass: antioxidant substances, sensory quality, microbial load and energy consumption

et al. 2019

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BACKGROUND: Young barley grass powder contains abundant nutrition and its antioxidant substances are severely impaired by radiation ( 60 Co) sterilization. To overcome product quality degradation, radiofrequency pasteurization was conducted using pilot-scale radiofrequency equipment (27 MHz, 6 kW) with electrode gaps of 12, 14 and 16 cm, while hot-air (80 ∘ C) pasteurization was used for comparison. RESULTS: Assessment suggested that uneven radiofrequency heating was improved for the 14 cm electrode gap. With an increase of electrode gap, microbial inactivation needs more energy consumption. A minimum energy consumption of 970 J g −1 was required for 1 log-reduction of colonies. Radiofrequency pasteurization retained better antioxidant substances, lightness (L*), green color (a*) and odors in barley grass powder, compared with hot-air sterilization. Contents of flavonoid and chlorophyll were 5.82 and 4.87 g kg −1 respectively, using the 14 cm electrode gap. Additionally, radiofrequency pasteurization led to an improvement in sourness, bitterness and umami tastes. CONCLUSIONS: Radiofrequency pasteurization would be a superior alternative for the pasteurization of barley grass powder. Temperature and moisture content Five fiber sensors (Nortech Fibronic Inc., Quebec, Canada) were placed in the middle layer of samples. Each process for detecting J Sci Food Agric 2019; 99: 4460-4467

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Section: Introductionmentioning

confidence: 99%

Radiofrequency heating for powder pasteurization of barley grass: antioxidant substances, sensory quality, microbial load and energy consumption

et al. 2019

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“…evaporator, (6) heat pump controller, (7) air fan, (8) drying tray, (9) drying chamber, (10) RF electrodes, (11) RF operating controller, (12) operating current intensity controller, (13) unit of supplying the operating voltage. The results show that the operation parameters achieve the designing requirement.…”

Section: Results Of Operating Parameters Of Rf Generatormentioning

confidence: 99%

“…fluctuate faster. Thus, heat generation within Ganoderma lucidum becomes faster, and the moisture diffusion within Ganoderma lucidum occurs faster [12,13].…”

Section: Drying Timementioning

confidence: 99%

Study on Designing and Manufacturing a Radio-Frequency Generator Used in Drying Technology and Efficiency of a Radio Frequency-Assisted Heat Pump Dryer in Drying of Ganoderma lucidum

Hay¹,

Duc²,

Kien³

2020

Innovation in Global Green Technologies 2020

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A radio-frequency (RF) generator applied in drying technology was designed and manufactured for drying Ganoderma lucidum. The drying experiments were conducted by drying method of RF-assisted heat pump in order to inspect the operating parameters of the RF generator and investigate the effects of the input drying parameters on drying rate in the RF-assisted heat pump drying of Ganoderma lucidum. The results have shown that the RF generator achieved the required operating parameters as design such as RF power of 3 kW and operating frequency of 27 MHz. In RF-assisted heat pump drying, increase in RF power and drying air temperature increases the drying rate. Meanwhile, drying air velocity does not significantly affect the drying rate. At RF power of 1.95 kW, the drying time reduces by 9, 17, and 33% in comparison with RF power of 1.3, 0.65, and 0 kW (heat pump drying). At drying air temperature of 50°C, the drying time reduces by 10% and 21% in comparison with drying air temperature of 40 and 45°C. Besides, increasing RF power retains the higher content of polysaccharide in Ganoderma lucidum, and the Ganoderma lucidum samples retain the color better after drying.

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“…However, one of the primary problems with RF heating is its edge effects on the surface of materials, which means higher temperatures at the edges and corners than those in the center parts of materials. These undesired edge effects usually result in nonuniformity of heating and deterioration in sensorial and nutritional properties and have been observed in potato, chicken meat, peanut, and corn flour …”

Section: Introductionmentioning

confidence: 99%

“…These undesired edge effects usually result in nonuniformity of heating and deterioration in sensorial and nutritional properties and have been observed in potato, chicken meat, peanut, and corn flour. [28][29][30][31] Current literature has mainly focused on biochemical and pharmacological functions of C. militaris. However, to the best of our knowledge, there has been no previous study that investigated the applicability of RF heating and its effect on the quality of C. militaris.…”

Section: Introductionmentioning

confidence: 99%

Effect of radio‐frequency heating on microbial load, flavor, color, and texture profiles of Cordyceps militaris

Liang

Zhang

Zhao³

2018

J Sci Food Agric

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Radio frequency heating of corn flour: Heating rate and uniformity

Cited by 76 publications

References 37 publications

Radiofrequency heating for powder pasteurization of barley grass: antioxidant substances, sensory quality, microbial load and energy consumption

Radiofrequency heating for powder pasteurization of barley grass: antioxidant substances, sensory quality, microbial load and energy consumption

Study on Designing and Manufacturing a Radio-Frequency Generator Used in Drying Technology and Efficiency of a Radio Frequency-Assisted Heat Pump Dryer in Drying of Ganoderma lucidum

Effect of radio‐frequency heating on microbial load, flavor, color, and texture profiles of Cordyceps militaris

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