Absrtact: The effects of microwave spouting drying, microwave drying equipment, hot air drying and vacuum freeze drying on the quality of Zizania latifolia were studied with Zizania latifolia granules as experimental materials. The water rehydration, color difference, texture and Vc retention were compared as reference indexes, and the energy consumption and drying time were also studied.
The results showed that vacuum freeze-drying had the best quality but the highest energy consumption, which was 20 times higher than microwave jet drying; microwave jet drying had better quality than hot-air drying, and the energy consumption of hot-air drying was 7 times higher than microwave jet drying; microwave drying had the shortest drying time and the lowest energy consumption, but the quality was the worst. Considering the comprehensive consideration of energy consumption and quality, microwave jet drying is a very potential drying method.
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