Improved Reactivity and Derivatization of Cellulose after Pre-Hydrolysis with Commercial Enzymes

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Reactivity is an important parameter when considering the chemical modification or dissolution of cellulose. Different pretreatment methods affect cellulose reactivity by decreasing its degree of polymerization (DP) and crystallinity. In this study, the molar mass of cellulose was decreased via enzymatic pretreatment. Three commercial endoglucanase-rich products were tested. The target was to reduce the viscosity of the pulp to below 200 mL/g and, thus, increase the reactivity of the cellulose. For comparison, cellulose was also pretreated with ozone, and the effects of each pretreatment method on crystallinity and monosaccharide composition of the resulting pulps were investigated. Both enzymatically treated and ozone-treated pulps were esterified using homogeneous and heterogeneous methods, and the degrees of substitution for these treated pulps were much higher than the esters when the untreated pulp was used. Cellulose esters from the pretreated pulps formed films with good mechanical properties by solvent casting.
Original languageEnglish
Pages (from-to)561-574
Number of pages14
JournalBioResources
Volume14
Issue number1
Publication statusPublished - 2019
MoE publication typeNot Eligible

Fingerprint

Cellulose
Pulp
cellulose
hydrolysis
Hydrolysis
Enzymes
enzyme
Ozone
crystallinity
ester
Esters
ozone
monosaccharide
Cellulase
Monosaccharides
Molar mass
Chemical modification
polymerization
pulp
mechanical property

Keywords

  • Cellulose
  • Enzymatic treatment
  • Ozone treatment
  • Cellulose esters

Cite this

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abstract = "Reactivity is an important parameter when considering the chemical modification or dissolution of cellulose. Different pretreatment methods affect cellulose reactivity by decreasing its degree of polymerization (DP) and crystallinity. In this study, the molar mass of cellulose was decreased via enzymatic pretreatment. Three commercial endoglucanase-rich products were tested. The target was to reduce the viscosity of the pulp to below 200 mL/g and, thus, increase the reactivity of the cellulose. For comparison, cellulose was also pretreated with ozone, and the effects of each pretreatment method on crystallinity and monosaccharide composition of the resulting pulps were investigated. Both enzymatically treated and ozone-treated pulps were esterified using homogeneous and heterogeneous methods, and the degrees of substitution for these treated pulps were much higher than the esters when the untreated pulp was used. Cellulose esters from the pretreated pulps formed films with good mechanical properties by solvent casting.",
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Improved Reactivity and Derivatization of Cellulose after Pre-Hydrolysis with Commercial Enzymes. / Willberg-Keyriläinen, Pia; Ropponen, Jarmo; Lahtinen, Manu; Pere, Jaakko.

In: BioResources, Vol. 14, No. 1, 2019, p. 561-574.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Pere, Jaakko

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