Is there any one can help me to answer these comments:

1/More information need to be added in SEM image based on shape and figure prints

2/Please comment on the SEM result. What insight can be obtained from the micrographs? is the applied magnification suitable???

FIGURE: Scanning electron micrographs showing structural changes of pretreated OPWP. (a) untreated OPWP (A and S). (b) Acid and steam explosion pretreatment of OPWP (A1 and S1).

DISCUSSION:

The micrographs showing the surface morphology of untreated and pretreated Orange peel waste (OPWP) are depicted in Figure 3. From Figure 3 (a), the surface of untreated OPWP A and S is irregular, rough and uneven. Also, the particle size and shape are different. Whereas Figure 3 (b), it has more irregular, rougher and more porous surface than the untreated OPWP. In addition, it has a swollen structure. (Borah et al. 2016) described that high pressure and temperature pretreatment causes lignin to fluidize and coalesce, resulting in a globular shape. Thus, the dilute acid sulfuric removes the hemicellulose and causes holes on the biomass surface as seen in Fig. 3 (b). (Saha et al. 2016; Yi et al. 2013) demonstrate that the dilute acid has major effect on cellulosic fibers by compromising the integrity of the cell wall of orange peel with release of sugar molecules.