title: Isolation and characterization of cellulose nanofibers from cassava root bagasse and peelings.
abstract: This work aimed to obtain and characterize nanofibers from cassava bagasse and peelings, which are waste originating from cassava starch extraction. To isolate the nanofibers, a combination of pre-treatments (alkaline treatment, Q-chelating treatment, bleaching), acid hydrolysis, and a final ultrasonic disintegration step were used. Acidic hydrolysis was conducted at a constant temperature of 60°C; the acid concentration (30, 40, and 50%) and the treatment time (30, 60, and 90min) were varied. The nanofibers were characterized for their morphology, surface charge, crystallinity index (XRD), and functional groups (FTIR). The diameters of the nanofibers ranged from 2.3nm to 5.4nm. The zeta potential values were lower than -47.7mV. As expected, all the products derived from acid hydrolysis displayed high crystallinity index. Finally, FTIR analysis confirmed that the isolation processes effectively removed amorphous materials such as lignin and hemicellulose from the nanofibers.
authors.affiliation: Department of Food Engineering, School of Food Engineering, University of Campinas, Campinas, SP CEP 13083-862, Brazil. Electronic address: anna_mpl@hotmail.com.
authors.forename: Anna Leticia Moron Pereira
authors.initials: ALMP
authors.lastname: Leite
authors.affiliation: Department of Food Engineering, School of Food Engineering, University of Campinas, Campinas, SP CEP 13083-862, Brazil.
authors.forename: Caroline Dalcin
authors.initials: CD
authors.lastname: Zanon
authors.affiliation: Department of Food Engineering, School of Food Engineering, University of Campinas, Campinas, SP CEP 13083-862, Brazil.
authors.forename: Florencia Cecilia
authors.initials: FC
authors.lastname: Menegalli
mesh_terms: D002482:Cellulose / Q000737:chemistry*; D002365:Manihot / Q000737:chemistry*; D057139:Nanofibers / Q000737:chemistry*; D018517:Plant Roots / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D002482:Cellulose; C027433:bagasse
keywords: Cassava bagasse; Cassava peelings; Cellulose; Nanofiber; Starch