As a result of the thermal and nonthermal effects of microwave energy,
degradation of lignin and cellulose in the cell wall of A. bisporus,
and formation of pectin-in-extensin entanglements were induced by
microwave treatment, and thesemodifications increased the hydrophilicity
and macromolecular mobility. During MVD, the uniformly dispersed
soluble small molecules with favorable water-holding capacity
acted as a vaporization agent, whereas the pectin-in-extensin plasticized
the wall material in the gas chambers. The MVD rate was so
high that themoisture in the cells vaporized rapidly, the vapor pressure
increased, and the cells swelled, resulting in the formation of a uniform
porous structure.