A novel enzymatic approach to nanocrystalline cellulose preparation

•NCC were produced with a greener technology.•Sulfuric acid can be reduced with a cellulase pretreatment.•The optimal conditions for enzymatic treatment were established.•The enzymatic treatment time was reduced.•Enzymatic effects on fibers led to proportional differences in NCC. In this work, condi...

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Bibliographic Details
Published inCarbohydrate polymers Vol. 189; pp. 39 - 47
Main Authors Beltramino, Facundo, Blanca Roncero, M., Vidal, Teresa, Valls, Cristina
Format Journal Article Publication
LanguageEnglish
Published England Elsevier Ltd 01.06.2018
Subjects
Cellulase
Cellulose nanocrystals
Cel·lulasa
Cel·lulosa
Enginyeria paperera
Fiber length
Fibers
Fibres
Fibres de cel·lulosa
Nanocrystalline cellulose
Optimization
Primeres matèries papereres
Yield increase
Àrees temàtiques de la UPC
Nanocrystalline cellulose
Yield increase
Fiber length
Cellulase
Optimization
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Summary:•NCC were produced with a greener technology.•Sulfuric acid can be reduced with a cellulase pretreatment.•The optimal conditions for enzymatic treatment were established.•The enzymatic treatment time was reduced.•Enzymatic effects on fibers led to proportional differences in NCC. 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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ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2018.02.015