NDLI: Inverse gas chromatography analysis of spruce fibers with different lignin content

Content Provider	Springer Nature Link
Author	Peterlin, Simona Planinšek, Odon Moutinho, Isabel Ferreira, Paulo Dolenc, Darko
Copyright Year	2010
Abstract	Unbleached TMP spruce fibers were stepwise delignified by KMnO4/H2SO4 and five partly delignified samples were obtained. Fibers were characterized in terms of carboxylic groups, lignin and hemicelluloses content. IGC measurements were performed in the untreated fibers and in the five delignified fiber samples, as well as in microcrystalline cellulose (MCC). Different parameters, such as the dispersive component of the surface free energy ( $$ \gamma_{{_{s} }}^{d} $$ ), the free energy and the enthalpy of adsorption with nonpolar probes ( $$ Δ G_{a}^{d} $$ and $$ Δ H_{a}^{d} $$ , respectively), as well as the specific interactions with polar probes, quantified by the free energy and the enthalpy of adsorption ( $$ Δ G_{a}^{s} $$ and $$ Δ H_{a}^{s} $$ , respectively), were determined. The values of $$ \gamma_{{_{s} }}^{d} $$ and $$ Δ G_{a}^{d} $$ are for all samples lower than for pure cellulose and vary slightly with the amount of lignin. For small contents of lignin, the values of $$ Δ G_{a}^{s} $$ of the acidic probes decrease with the delignification whereas those of the basic probes increase, pointing to a rather acidic character of the fibers due to the increase of the relative amount of the carbohydrates. The values for MCC corroborate these findings. Despite the substantial variation in the carboxylic group content during delignification, no clear tendencies were detected regarding the affinity with the basic probes.
Starting Page	1095
Ending Page	1102
Page Count	8
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	17
Issue Number	6
e-ISSN	1572882X
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-08-29
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Wood fibers Delignification Lignin Hemicelluloses Inverse gas chromatography Polymer Sciences Organic Chemistry Physical Chemistry Bioorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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