As a polar solvent, water can efficiently absorb microwave energyand leads to efficient heating. Moreover, the microwave irradi-ation accelerates cell rupture by sudden temperature rise andinternal pressure increase inside the cells of plant sample, whichpromotes the destruction of sample surface and in turns theexudation of pectin within the plant cells into the surroundingsolvents (Zhang, Yang, & Liu, 2008) and increased the extractionyield