Drying characteristics and process optimization of vacuum far-infrared radiation drying on Cornus Officinalis

摘要

Recently, vacuum far-infrared radiation (VFIR) drying has received more and more attention because of its effective and successful applications in drying agricultural products, fruits and vegetables. Drying characteristics of VFIR drying on Cornus officinalis was studied in this research, and orthogonal regression experiment was designed and carried out. The results showed that with increase of heater's temperature and decrease of chamber's pressure, drying rate and loganin content increase, and the influence of heater's temperature is more significant than that of pressure. With nonlinear programming analysis method, the optimized process parameters are obtained as heater's temperature 98.6 °C and pressure 1000 Pa, and the corresponding drying time and loganin content are 250 min and 1.18%, respectively.