A Study on Effects of Temperature and Velocity of Drying Air on Flavonoids Extraction Rate of Houttuynia Cordata Thunb

Abstract

The main aim of this paper is to present experimental results concerning the effects of the temperature and velocity of drying air on the flavonoids extraction rate of houttuynia cordata thunb by heat pump dryer under real weather conditions at Ho Chi Minh City, Vietnam. Drying experiments were carried out at the drying air temperature of 35, 40, 45 and 50 °C, and drying air velocity of 1.0, 1.5, 2.0 and 2.5 m/s, respectively. The experimental results showed that the highest amount of flavonoid extraction rate of the houttuynia cordata thunb was 87.525 mg/g corresponding to the drying air temperature of 45 °C and drying air velocity of 2.0 m/s. The aim also involves analyzing the effects of the drying temperature and drying velocity on the drying time, moisture content, and the specific moisture extraction rate (SMER).