SEM observations of untreated and microwave pretreated
mulberry stem showed that the pretreatment induced
physical changes in the biomass.
The untreated mulberry stem
has smooth and continuous surface whereas the microwave pre-
treated sugarcane bagasse has a rough surface.MAL treated biomass
showed a sieve like structure. This indicates that pretreatment
removed external fibers which in turn increase surface area so that
cellulose becomes more accessible to enzymes.