Etherification of Wood-Based Hemicelluloses for Interfacial Activity

Tiina Nypelö, Christiane Laine, Masaaki Aoki, Tekla Tammelin, Ute Henniges

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

We present wetting, hygroscopicity, and interfacial activity of hemicellulose with respect to etherification and contrast it to their potential as interfacial modifiers, which is demonstrated by oil-in-water emulsification containing up to 60 vol% of the oil phase. Tunable amphiphilicity of hardwood and softwood hemicelluloses, xylans, and galactoglucomannans, respectively, was accomplished via controlled etherification. A series of degree of substitution (DS) of hydroxypropylated and 3-butoxy-2-hydroxypropylated ("butylated") grades was synthesized. The hemicellulose ethers were characterized by gel permeation chromatography, spectroscopic techniques, such as NMR, and contact angle measurements. An attenuated total reflectance infrared method was developed for fast identification of the DS. Near infrared analysis was utilized to explore the hygroscopicity of the material and to perform principle component analysis. The modification to butylated grades decreased the hygroscopicity, whereas the hydroxypropylated grades bound moisture. All of the hemicellulose ethers were water-soluble. The interfacial tension of the aqueous hemicellulose solutions was determined by pendant-drop tensiometer, and it was demonstrated to be dependent on the degree of modification.
Original languageEnglish
Pages (from-to)1894-1901
JournalBiomacromolecules
Volume17
Issue number5
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Fingerprint

Ethers
Wood
Substitution reactions
Infrared radiation
Emulsification
Softwoods
Hardwoods
Gel permeation chromatography
Angle measurement
Contact angle
Surface tension
Wetting
Water
Moisture
Nuclear magnetic resonance
Oils
Xylans
hemicellulose

Keywords

  • hemicellulose ethers
  • xylan
  • galactoglucomannan
  • interfacial properties

Cite this

Nypelö, Tiina ; Laine, Christiane ; Aoki, Masaaki ; Tammelin, Tekla ; Henniges, Ute. / Etherification of Wood-Based Hemicelluloses for Interfacial Activity. In: Biomacromolecules. 2016 ; Vol. 17, No. 5. pp. 1894-1901.
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Etherification of Wood-Based Hemicelluloses for Interfacial Activity. / Nypelö, Tiina; Laine, Christiane; Aoki, Masaaki; Tammelin, Tekla; Henniges, Ute.

In: Biomacromolecules, Vol. 17, No. 5, 2016, p. 1894-1901.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Etherification of Wood-Based Hemicelluloses for Interfacial Activity

AU - Nypelö, Tiina

AU - Laine, Christiane

AU - Aoki, Masaaki

AU - Tammelin, Tekla

AU - Henniges, Ute

N1 - Project code: 86663

PY - 2016

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N2 - We present wetting, hygroscopicity, and interfacial activity of hemicellulose with respect to etherification and contrast it to their potential as interfacial modifiers, which is demonstrated by oil-in-water emulsification containing up to 60 vol% of the oil phase. Tunable amphiphilicity of hardwood and softwood hemicelluloses, xylans, and galactoglucomannans, respectively, was accomplished via controlled etherification. A series of degree of substitution (DS) of hydroxypropylated and 3-butoxy-2-hydroxypropylated ("butylated") grades was synthesized. The hemicellulose ethers were characterized by gel permeation chromatography, spectroscopic techniques, such as NMR, and contact angle measurements. An attenuated total reflectance infrared method was developed for fast identification of the DS. Near infrared analysis was utilized to explore the hygroscopicity of the material and to perform principle component analysis. The modification to butylated grades decreased the hygroscopicity, whereas the hydroxypropylated grades bound moisture. All of the hemicellulose ethers were water-soluble. The interfacial tension of the aqueous hemicellulose solutions was determined by pendant-drop tensiometer, and it was demonstrated to be dependent on the degree of modification.

AB - We present wetting, hygroscopicity, and interfacial activity of hemicellulose with respect to etherification and contrast it to their potential as interfacial modifiers, which is demonstrated by oil-in-water emulsification containing up to 60 vol% of the oil phase. Tunable amphiphilicity of hardwood and softwood hemicelluloses, xylans, and galactoglucomannans, respectively, was accomplished via controlled etherification. A series of degree of substitution (DS) of hydroxypropylated and 3-butoxy-2-hydroxypropylated ("butylated") grades was synthesized. The hemicellulose ethers were characterized by gel permeation chromatography, spectroscopic techniques, such as NMR, and contact angle measurements. An attenuated total reflectance infrared method was developed for fast identification of the DS. Near infrared analysis was utilized to explore the hygroscopicity of the material and to perform principle component analysis. The modification to butylated grades decreased the hygroscopicity, whereas the hydroxypropylated grades bound moisture. All of the hemicellulose ethers were water-soluble. The interfacial tension of the aqueous hemicellulose solutions was determined by pendant-drop tensiometer, and it was demonstrated to be dependent on the degree of modification.

KW - hemicellulose ethers

KW - xylan

KW - galactoglucomannan

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DO - 10.1021/acs.biomac.6b00355

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JO - Biomacromolecules

JF - Biomacromolecules

SN - 1525-7797

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