*3.2. XRD Results*

Figure 3 shows XRD patterns of samples associated with different related ubim fiber conditions: (a) vertical stalk (VS); (b) vertical fiber (VF); (c) horizontal stalk (HS); and (d) horizontal fiber (HF). It should be noted that in both conditions (a) and (b), the peak associated with (2 0 0) is the prominent one. This peak is related to the cellulose crystalline part of the fiber and was the peak used to assess MFA [38]. As for condition (c) and (d), the same pattern is not repeated and it was not possible to calculate the corresponding MFA.

A preliminary evaluation of the percentage of crystalline cellulose by Rietveld revealed values of around 66% for conditions (a) and (b).
