Influence of temperature and ultrasound on drying kinetics and antioxidant properties of red pepper

Red pepper samples (1 m/s) were dried at different temperatures (30, 50, 70 °C) without and with (20.5 kW/m 3 ; 21.7 kHz) ultrasound application. The antioxidant capacity (AC), the total phenolic content (TPC), and the ascorbic acid (AA) content of fresh and dried red pepper samples were used as ind...

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Bibliographic Details
Published in:Drying technology 2019-03, Vol.37 (4), p.486-493
Main Authors: Cárcel, J. A., Castillo, D., Simal, S., Mulet, A.
Format: Article
Language:English
Subjects:
Antioxidants
Ascorbic acid
Dehydration
Drying
drying time
effective diffusivity
Kinetics
Mass transport
modeling
Phenols
quality
Reduction
Temperature
Ultrasonic imaging
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Summary:Red pepper samples (1 m/s) were dried at different temperatures (30, 50, 70 °C) without and with (20.5 kW/m 3 ; 21.7 kHz) ultrasound application. The antioxidant capacity (AC), the total phenolic content (TPC), and the ascorbic acid (AA) content of fresh and dried red pepper samples were used as indicators of the quality of the dried products. Ultrasound application significantly improved the kinetics in every case, influencing not only the effective diffusivity but also the mass transport coefficient thus implying a reduction in energy needs. Drying significantly reduced AC, TPC, and AA, this reduction being significantly smaller at 70 °C due to the shorter drying time. Compared with conventional drying, ultrasound application reduced the loss of antioxidant properties at 50 °C but produced greater degradation at 70 °C, which points toward an optimal drying temperature when using ultrasound.
ISSN:0737-3937
1532-2300
DOI:10.1080/07373937.2018.1473417