Optimization of sulfuric acid hydrolysis conditions for preparation of nanocrystalline cellulose from enzymatically pretreated fibers

Beltramino, Facundo; Roncero, M. Blanca; Torres, Antonio; Vidal, Teresa; Valls, Cristina

doi:10.1007/s10570-016-0897-y

Cited by 82 publications

(45 citation statements)

References 35 publications

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“…Many studies have referred to the effects of sulfuric acid concentration on CNCs prepared from raw cellulosic materials with the polymorph of cellulose I. 10,12,30 In consideration of the effects of polymorphs, the typical sulfuric acid concentration (64 wt%) for cellulose I may not be optimal for cellulose II or cellulose III. Thus, in this work, three different polymorphs have been identied for cellulose I, cellulose II, and cellulose III.…”

Section: Introductionmentioning

confidence: 99%

Research on cellulose nanocrystals produced from cellulose sources with various polymorphs

et al. 2017

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Section: Introductionmentioning

confidence: 99%

Research on cellulose nanocrystals produced from cellulose sources with various polymorphs

et al. 2017

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“…Optimizations via factorial designs have been widely used in literature for optimizing enzymatic and chemical treatments for diverse applications (Bondeson, Mathew, & Oksman, 2006;Fillat & Roncero, 2009Valls & Roncero, 2009). In a previous study, conditions of sulfuric acid hydrolysis in order to maximize NCC yield from cellulase-pretreated fibers were optimized using a factorial design (Beltramino, Roncero, Torres, Vidal, & Valls, 2016). Maximal yield was achieved with 25 minutes of hydrolysis at 47ºC and using 62% wt.…”

Section: Introductionmentioning

confidence: 99%

A novel enzymatic approach to nanocrystalline cellulose preparation

Beltramino

Roncero

Vidal

et al. 2018

Carbohydrate Polymers

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In this work, conditions for an enzymatic pretreatment prior to NCC isolation from cotton linter were assessed. Different cellulase doses and reaction times were studied within an experimental design and NCC were obtained. At optimal enzymatic conditions (20U, 2 h), a total yield greater than 80% was achieved and the necessary enzymatic treatment time was reduced 90%. Different intensities of enzymatic treatments led to proportional decreases in fiber length and viscosity and also were inversely proportional to the amount of released oligosaccharides. These differences within fibers lead to quantitative differences in NCC: increase in acid hydrolysis yield, reduction of NCC surface charge and crystallinity increase. Benefits produced by enzymatic treatments did not have influence over other NCC characteristics such as their sulfur content (≈1%), size (≈200 nm), zeta potential (≈-50 mV) or degree of polymerization (≈200). Evidence presented in this work would reduce the use of harsh sulfuric acid generating a cleaner stream of profitable oligosaccharides.

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“…Therefore, enzymatic hydrolysis has been combined with mechanical fibrillation to loosen microfibril layers and produce nanofibers. Preparation of cellulose nanocrystals (CNC) using sulfuric acid hydrolysis was optimized to obtain a high yield of CNC from cellulase-pretreated fibers (Beltramino et al 2016). Apart from CNC, microfibrillated cellulose (MFC) and CNF have been prepared using endoglucanase hydrolysis with subsequent high-pressure homogenization or microfluidization (Pääkkö et al 2007;Wang et al 2015b).…”

Section: Introductionmentioning

confidence: 99%

Enzyme-assisted Mechanical Fibrillation of Bleached Spruce Kraft Pulp for Producing Well-dispersed and Uniform-sized Cellulose Nanofibrils

Bian¹,

Li²,

Ji³

et al. 2016

BioResources

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Cellulose nanofibrils (CNFs) are bionanomaterials with many promising properties and great potential in composite applications. Herein, welldispersed and uniform-sized cellulose nanofibrils were successfully obtained from commercially bleached softwood kraft pulp, resulting in yields of 79.15% via enzyme-assisted hydrolysis and subsequent homogenization. Field emission scanning electron microscopy (FE-SEM) confirmed the fiber morphology. The water retention value (WRV) was increased from 107% of original pulp to 1384% of the resulting CNFs, while crystallinity had no significant changes. Fourier transform infrared (FTIR) spectroscopy indicated that enzymes degraded a portion of hemicelluloses and residual lignin. CNFs subjected to enzymatic treatment and homogenization had a less entangled network, larger aspect ratio, and higher transmittance than those from pure mechanical treatment. They were well dispersed in an aqueous solution and uniformly sized in morphology, resolving the present challenge of nanomaterials tendency for agglomeration. These results revealed that the enzymeassisted process had a remarkable effect on the production of CNFs and made CNFs more appealing for nanotechnology applications and nanomaterial.

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Optimization of sulfuric acid hydrolysis conditions for preparation of nanocrystalline cellulose from enzymatically pretreated fibers

Cited by 82 publications

References 35 publications

Research on cellulose nanocrystals produced from cellulose sources with various polymorphs

Research on cellulose nanocrystals produced from cellulose sources with various polymorphs

A novel enzymatic approach to nanocrystalline cellulose preparation

Enzyme-assisted Mechanical Fibrillation of Bleached Spruce Kraft Pulp for Producing Well-dispersed and Uniform-sized Cellulose Nanofibrils

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