Portal de Periódicos da CAPES

Artigo Produção Nacional Revisado por pares

BIBTEX RIS

Extraction of Nanocellulose from Yerba Mate Residues Using Steam Explosion, TEMPO-mediated Oxidation and Ultra-fine Friction Grinding

2021; Taylor & Francis; Volume: 19; Issue: 15 Linguagem: Inglês

10.1080/15440478.2021.1994095

1544-0478

Ruan Ezequiel Gemmer, Cleide Borsoi, Betina Hansen, Marcos Aurélio Dahlem Júnior, Édson Luiz Francisquetti, Lílian Vanessa Rossa Beltrami, Ademir J. Zattera, André Luís Catto,

Ginkgo biloba and Cashew Applications

In this work, we evaluated the extraction of nanocellulose from agro-industrial residue of yerba mate (YM, Ilex paraguariensis, St.Hil) sticks through chemical (bleaching and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation), physical (steam explosion) and mechanical (ultra-fine friction grinding) treatments, divided into three distinct sequences for method comparison. The results showed that steam explosion as the initial treatment step makes an increase of up to 23% in the crystallinity index of cellulose nanofiber (CNF) in relation to the raw sample. The TEMPO-mediated oxidation resulted in more dispersed CNF, verified by transmission electron microscopy (TEM). Samples treated by steam-explosion and ultrafine grinding showed a higher yield in relation to steam-explosion and oxidative treatment (24.3% versus 16.2% respectively). CNFs with a diameter of 6 nm and a length range of 2200 to 2600 nm were obtained.