Subsequently, the resulting suspension of dialysis process was treated using a disperser type UltraTurrax for 5 min at 20,000 rpm and sonicated for 5 min. The colloidal suspension was stored in a refrigerator at 4 ◦ C with the addition of some drops of chloroform to avoid any bacterial growth. The cellulose nanocrystals or whiskers of soy hulls were labeled WSH30 or WSH40 depending on the time of extraction.
2.3. Gravimetric analysis
The hydrolysis yield and the WSH concentration in the final sus- pension were calculated drying an aliquot of the suspension with a known volume at 105 ◦ C for 12 h in an air-circulating oven.