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Using commercial enzymes to produce cellulose nanofibers from soybean straw

Abstract

This study used commercial enzymes to isolate cellulose nanofibrils (CN) and produce sugars from chemically pretreated soybean straw (SS) (stem, leaves, and pods) by alkali (NaOH 5 or 17.5% v/v at 90 oC for 1h, or at 30 oC for 15 h) and bleaching (NaClO2 3.3% or H2O2 4%) pretreatments. Depending on the pretreatment the soybean straw underwent, the yield of CN varied from 6.3 to 7.5 g of CN/100 g of SS regardless of the concentration of the alkaline solution (5 or 17.5%). The CN had diameter of 15 nm, measured over 300 nm in length, and had high electrical stability (zeta potentials ranged from -20.8 to -24.5). Given the XRD patterns, the crystallinity index (CrI) of CN ranged from 45 to 68%, depending on the chemical pretreatment the starting material was submitted to. CN obtained from SS treated with NaOH 17.5% and H2O2 (CrI = 45%) displayed better thermal stability probably because a lignin-cellulose complex emerged. The soluble fraction obtained in the first step of CN production contained a large amount of reducing sugars (11.2 to 30.4 g/100 g of SS). SS seems to be a new promising industrial source to produce CN via enzymatic-mechanical treatment, leading to large amounts of reducing sugars for use in bioenergy production. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MARTELLI-TOSI, MILENA; TORRICILLAS, MARCELA DA SILVA; MARTINS, MARIA ALICE; GARRIDO DE ASSIS, ODILIO BENEDITO; TAPIA-BLACIDO, DELIA RITA. Using Commercial Enzymes to Produce Cellulose Nanofibers from Soybean Straw. Journal of Nanomaterials, . (16/16222-0, 12/22154-7, 14/02432-8)
MARTELLI-TOSI, MILENA; TORRICILLAS, MARCELA DA SILVA; MARTINS, MARIA ALICE; GARRIDO DE ASSIS, ODILIO BENEDITO; TAPIA-BLACIDO, DELIA RITA. Using Commercial Enzymes to Produce Cellulose Nanofibers from Soybean Straw. Journal of Nanomaterials, v. 2016, p. 10-pg., . (16/16222-0, 12/22154-7, 14/02432-8)

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