Optimization of Microwave Vacuum Drying and Pretreatment Methods for Polygonum cuspidatum

Figure 5

Drying curves of P. cuspidatum slices at blanching for 30 s at 100°C, vacuum pressure at 200 mbar and 60°C; blanching for 30 s at 100°C, vacuum pressure at 400 mbar and 70°C; and blanching for 30 s at 100°C, vacuum pressure at 600 mbar and 50°C.