Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 130, Issue -, Pages 622-626Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2019.02.166
Keywords
Mechanical pretreatment; Cellulose nanocrystals; H2SO4 hydrolysis
Funding
- Brazilian funding agency CNPq (Conselho Nacional de Pesquisa) [306245/2014-0]
- Brazilian funding agency CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior) [001]
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The mechanical pretreatments intensities on characteristics of cellulose nanocrystals (CNC) prior to acid hydrolysis was evaluated. The cellulose was submitted to mechanical pretreatment as: magnetic stirring (CNCst), blending (CNCbl) or grinding by 20 (CNC20x) and 40 (CNC(40)x) passages in a super mass colloid mill. Then, all samples were submitted to H2SO4 hydrolysis and the CNC were evaluated by total mass yield (TMY%), theological behavior, size distribution for width/length (WD), crystallinity index (CI%), OSO3- substitution degree (SD) and zeta potential (zeta). After hydrolysis samples exhibited the same SD (190 +/- 5 mMol . kg(-1)), (-55 +/- 3 mV) and CI% (65 +/- 2), differing only in TMY% and WD. The CNCst showed TMY% of 85%, WD of 8 +/- 5 nm and 100-800 nm, with presence of cellulose nanofibers (CNF), suggesting incomplete hydrolysis. The CNCbl and CNC20x revealed TMY% of 65 +/- 1, but differed in WD of 8 +/- 5 nm and 300 +/- 200 nm and 8 +/- 5 nm and 200 +/- 170 nm, respectively. The results showed that the grinding mechanical pretreatment is mandatory for CNF isolation, but not for CNC. Stability profile after the hydrolytic procedure, CI%, morphology and similar character generated CNC with adequate features and good yield, by simple mechanical stirring or blending, reducing the production's cost and allowing industrial-scale production. (C) 2019 Elsevier B.V. All rights reserved.
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