Rice and coffee husks were ground in a bladed mill until 0.75 mm in size to promote the extraction, which was performed in a 5 L pilot scale reactor by pressurized hot water. To this end, 750 g (rice husk) or 650 g (coffee husk) and 3 L of distilled water were used and the operation was carried out for 60 min at 180 °C, 9.5 bar, according toprevious studies . Then, the extracts were separated from the solid fraction, which was dried for the purposes of subsequently extracting the cellulose fibres. Rice and coffee extracts were concentrated at 90 °C under continuous stirring, obtaining about 6.5 and 7 g ss/mL extracts, respectively. To obtain a powdered product, the aqueous extracts were spray dried by using a Vibrasec pilot dryer model Pasalab 1.5 , operating at 180 °C and 90 °C outlet temperature, with atomizer disk speed of 24,000 rpm. Maltodextrin (18 DE) at 32.1 and 29.8 wt% was added to the rice and coffee extracts, respectively, as drying coadjuvant.