Abstract: Using fresh bitter gourd as raw material, the characteristics of microwave drying equipment and physical and chemical quality were studied after hot air drying at 40, 50 and 60 °C.
The results showed that the hot air temperature significantly affected the drying characteristics of bitter gourd slices. The higher the hot air temperature, the higher the drying rate of bitter gourd slices, the shorter the drying time, the higher the effective diffusion coefficient of water. The activation energy of bitter melon tablets after hot air drying at 40~60 °C was 14.40 kJ/mol; Among them, the hot air drying treatment time of 60 °C is short, and the dried bitter gourd tablets have large rehydration ratio, low browning degree, high total phenol and total flavonoid content, and strong DPPH·clearing ability. Therefore, 60 °C is the optimum temperature for hot air drying of bitter gourd slices.
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