Significance of xylan and glucomannan in the brightness reversion of kraft pulps

Johanna Buchert, Elisabeth Bergnor, Gunnar Lindblad, Liisa Viikari, Monica Ek

Research output: Contribution to journalArticleScientificpeer-review

84 Citations (Scopus)

Abstract

The brightness reversion of kraft pulps is caused by the presence of residual lignin, chlorinated extractives, or oxidized carbohydrates. The effect of hemicellulose content, i.e., xylan (I) and glucomannan (II), on the thermal stability of modern bleached kraft pulps was investigated. Different O-delignified hard- and softwood kraft pulps were bleached with different bleaching sequences contg. ClO2, H2O2, or O3. Hemicellulose-degrading enzymes, i.e., xylanase or mannanase, were used for selective removal of the resp. hemicellulose from the pulps, and the role of partially removed I and II on the brightness stability of these pulps was studied. Because of the structure of kraft I, enzymic removal of I also resulted in a decreased carboxyl group content in the pulps, whereas II removal did not affect the carboxyl group content. By decreasing the carboxyl groups in the pulps in conjunction with I removal, the thermal aging of the pulps was significantly decreased. The role of II was less significant. Thus, the uronic acids present in the pulp participate in the brightness reversion of kraft pulps.
Original languageEnglish
Pages (from-to)165 - 171
Number of pages7
JournalTappi Journal
Volume80
Issue number6
Publication statusPublished - 1997
MoE publication typeA1 Journal article-refereed

Fingerprint

Xylans
Kraft pulp
Pulp
Luminance
Uronic Acids
Bleached pulp
Thermal aging
Softwoods
Hardwoods
Carbohydrates
Bleaching
Lignin
(1-6)-alpha-glucomannan
Thermodynamic stability
Enzymes
Acids
hemicellulose

Cite this

Buchert, J., Bergnor, E., Lindblad, G., Viikari, L., & Ek, M. (1997). Significance of xylan and glucomannan in the brightness reversion of kraft pulps. Tappi Journal, 80(6), 165 - 171.
Buchert, Johanna ; Bergnor, Elisabeth ; Lindblad, Gunnar ; Viikari, Liisa ; Ek, Monica. / Significance of xylan and glucomannan in the brightness reversion of kraft pulps. In: Tappi Journal. 1997 ; Vol. 80, No. 6. pp. 165 - 171.
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abstract = "The brightness reversion of kraft pulps is caused by the presence of residual lignin, chlorinated extractives, or oxidized carbohydrates. The effect of hemicellulose content, i.e., xylan (I) and glucomannan (II), on the thermal stability of modern bleached kraft pulps was investigated. Different O-delignified hard- and softwood kraft pulps were bleached with different bleaching sequences contg. ClO2, H2O2, or O3. Hemicellulose-degrading enzymes, i.e., xylanase or mannanase, were used for selective removal of the resp. hemicellulose from the pulps, and the role of partially removed I and II on the brightness stability of these pulps was studied. Because of the structure of kraft I, enzymic removal of I also resulted in a decreased carboxyl group content in the pulps, whereas II removal did not affect the carboxyl group content. By decreasing the carboxyl groups in the pulps in conjunction with I removal, the thermal aging of the pulps was significantly decreased. The role of II was less significant. Thus, the uronic acids present in the pulp participate in the brightness reversion of kraft pulps.",
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Buchert, J, Bergnor, E, Lindblad, G, Viikari, L & Ek, M 1997, 'Significance of xylan and glucomannan in the brightness reversion of kraft pulps', Tappi Journal, vol. 80, no. 6, pp. 165 - 171.

Significance of xylan and glucomannan in the brightness reversion of kraft pulps. / Buchert, Johanna; Bergnor, Elisabeth; Lindblad, Gunnar; Viikari, Liisa; Ek, Monica.

In: Tappi Journal, Vol. 80, No. 6, 1997, p. 165 - 171.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Ek, Monica

PY - 1997

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N2 - The brightness reversion of kraft pulps is caused by the presence of residual lignin, chlorinated extractives, or oxidized carbohydrates. The effect of hemicellulose content, i.e., xylan (I) and glucomannan (II), on the thermal stability of modern bleached kraft pulps was investigated. Different O-delignified hard- and softwood kraft pulps were bleached with different bleaching sequences contg. ClO2, H2O2, or O3. Hemicellulose-degrading enzymes, i.e., xylanase or mannanase, were used for selective removal of the resp. hemicellulose from the pulps, and the role of partially removed I and II on the brightness stability of these pulps was studied. Because of the structure of kraft I, enzymic removal of I also resulted in a decreased carboxyl group content in the pulps, whereas II removal did not affect the carboxyl group content. By decreasing the carboxyl groups in the pulps in conjunction with I removal, the thermal aging of the pulps was significantly decreased. The role of II was less significant. Thus, the uronic acids present in the pulp participate in the brightness reversion of kraft pulps.

AB - The brightness reversion of kraft pulps is caused by the presence of residual lignin, chlorinated extractives, or oxidized carbohydrates. The effect of hemicellulose content, i.e., xylan (I) and glucomannan (II), on the thermal stability of modern bleached kraft pulps was investigated. Different O-delignified hard- and softwood kraft pulps were bleached with different bleaching sequences contg. ClO2, H2O2, or O3. Hemicellulose-degrading enzymes, i.e., xylanase or mannanase, were used for selective removal of the resp. hemicellulose from the pulps, and the role of partially removed I and II on the brightness stability of these pulps was studied. Because of the structure of kraft I, enzymic removal of I also resulted in a decreased carboxyl group content in the pulps, whereas II removal did not affect the carboxyl group content. By decreasing the carboxyl groups in the pulps in conjunction with I removal, the thermal aging of the pulps was significantly decreased. The role of II was less significant. Thus, the uronic acids present in the pulp participate in the brightness reversion of kraft pulps.

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Buchert J, Bergnor E, Lindblad G, Viikari L, Ek M. Significance of xylan and glucomannan in the brightness reversion of kraft pulps. Tappi Journal. 1997;80(6):165 - 171.