Hybrid drying of kale (Brassica Oleracea L.) - influence of simulataneous application of ultrasound and microwaves on drying kinetics and quality
[ 1 ] Instytut Technologii i Inżynierii Chemicznej, Wydział Technologii Chemicznej, Politechnika Poznańska | [ P ] employee
2022
chapter in monograph / paper
english
EN This study analyzes the hybrid drying of kale leaves through convection assisted with microwaves and airborne ultrasound at two different temperatures of 50 and 70 °C. The analysis presents the parameters of drying kinetics and specific energy consumption, as well as selected quality indicators such as relative color change, browning index, and the ascorbic acid, phenolic, carotenoid and chlorophyll retention. The results revealed that the drying rate increased with an increase in microwave/ultrasound power and air temperature, while improving the energy efficiency of hybrid drying, as compared to solely convective drying. The quality assessment proved that all kale samples dried by different methods were characterized by similar color, but the highest retention of vitamin C, phenolics and natural dyes was found in products dried at higher temperature and greater power of mcrowaves and/or ultrasound.
421 - 431
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