Bleaching of mechanical pulps: Implications of demethylation of pectin for pulp brightness

Jaakko Pere; J. P. Isoaho; S. Jussila; Anna Suurnäkki; Raimo Alén

Bleaching of mechanical pulps: Implications of demethylation of pectin for pulp brightness

Jaakko Pere, J. P. Isoaho, S. Jussila, Anna Suurnäkki, Raimo Alén

VTT Technical Research Centre of Finland

University of Jyväskylä

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

Abstract

Dithionite bleaching of mechanical pulps and fractions thereof could be boosted by enzymatic pretreatment with pectinmethylesterase (PE). As a consequence of hydrolytic action of PE partial demethylation of pectin occurred with a concurrent release of methanol and increase in pulp charge. Demethylation of pectin by PE was associated with release of chromophoric components in successive dithionite bleaching. Evidently, brightness gain observed with the pulps and fines fraction was due to this release of lignin derived components. Main findings observed in the laboratory were also verified in pilot trials at CTP.

Original language	English
Title of host publication	59th Appita Annual Conference and Exhibition: Incorporating the 13th ISWFPC (International Symposium on Wood, Fibre and Pulping Chemistry), Auckland, New Zealand, 16-19 May 2005
Subtitle of host publication	Proceedings
Publisher	Appita
Pages	311-315
Publication status	Published - 2005
MoE publication type	A4 Article in a conference publication
Event	59th Appita Annual Conference and Exhibition: Incorporating the 13th ISWFPC (International Symposium on Wood, Fibre and Pulping Chemistry) - Auckland, New Zealand Duration: 16 May 2005 → 19 May 2005 Conference number: 59

Publication series

Series	Appita Annual Conference Proceedings
ISSN	1443-5454

Conference

Conference	59th Appita Annual Conference and Exhibition
Country/Territory	New Zealand
City	Auckland
Period	16/05/05 → 19/05/05

Cite this

Pere, J., Isoaho, J. P., Jussila, S., Suurnäkki, A., & Alén, R. (2005). Bleaching of mechanical pulps: Implications of demethylation of pectin for pulp brightness. In 59th Appita Annual Conference and Exhibition: Incorporating the 13th ISWFPC (International Symposium on Wood, Fibre and Pulping Chemistry), Auckland, New Zealand, 16-19 May 2005: Proceedings (pp. 311-315). Appita.

Pere, Jaakko ; Isoaho, J. P. ; Jussila, S. et al. / Bleaching of mechanical pulps: Implications of demethylation of pectin for pulp brightness. 59th Appita Annual Conference and Exhibition: Incorporating the 13th ISWFPC (International Symposium on Wood, Fibre and Pulping Chemistry), Auckland, New Zealand, 16-19 May 2005: Proceedings. Appita, 2005. pp. 311-315 (Appita Annual Conference Proceedings).

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abstract = "Dithionite bleaching of mechanical pulps and fractions thereof could be boosted by enzymatic pretreatment with pectinmethylesterase (PE). As a consequence of hydrolytic action of PE partial demethylation of pectin occurred with a concurrent release of methanol and increase in pulp charge. Demethylation of pectin by PE was associated with release of chromophoric components in successive dithionite bleaching. Evidently, brightness gain observed with the pulps and fines fraction was due to this release of lignin derived components. Main findings observed in the laboratory were also verified in pilot trials at CTP.",

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Pere, J, Isoaho, JP, Jussila, S, Suurnäkki, A & Alén, R 2005, Bleaching of mechanical pulps: Implications of demethylation of pectin for pulp brightness. in 59th Appita Annual Conference and Exhibition: Incorporating the 13th ISWFPC (International Symposium on Wood, Fibre and Pulping Chemistry), Auckland, New Zealand, 16-19 May 2005: Proceedings. Appita, Appita Annual Conference Proceedings, pp. 311-315, 59th Appita Annual Conference and Exhibition, Auckland, New Zealand, 16/05/05.

Bleaching of mechanical pulps: Implications of demethylation of pectin for pulp brightness. / Pere, Jaakko; Isoaho, J. P.; Jussila, S. et al.
59th Appita Annual Conference and Exhibition: Incorporating the 13th ISWFPC (International Symposium on Wood, Fibre and Pulping Chemistry), Auckland, New Zealand, 16-19 May 2005: Proceedings. Appita, 2005. p. 311-315 (Appita Annual Conference Proceedings).

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

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T1 - Bleaching of mechanical pulps: Implications of demethylation of pectin for pulp brightness

AU - Pere, Jaakko

AU - Isoaho, J. P.

AU - Jussila, S.

AU - Suurnäkki, Anna

AU - Alén, Raimo

N1 - Conference code: 59

PY - 2005

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AB - Dithionite bleaching of mechanical pulps and fractions thereof could be boosted by enzymatic pretreatment with pectinmethylesterase (PE). As a consequence of hydrolytic action of PE partial demethylation of pectin occurred with a concurrent release of methanol and increase in pulp charge. Demethylation of pectin by PE was associated with release of chromophoric components in successive dithionite bleaching. Evidently, brightness gain observed with the pulps and fines fraction was due to this release of lignin derived components. Main findings observed in the laboratory were also verified in pilot trials at CTP.

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M3 - Conference article in proceedings

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BT - 59th Appita Annual Conference and Exhibition: Incorporating the 13th ISWFPC (International Symposium on Wood, Fibre and Pulping Chemistry), Auckland, New Zealand, 16-19 May 2005

PB - Appita

T2 - 59th Appita Annual Conference and Exhibition

Y2 - 16 May 2005 through 19 May 2005

ER -

Pere J, Isoaho JP, Jussila S, Suurnäkki A, Alén R. Bleaching of mechanical pulps: Implications of demethylation of pectin for pulp brightness. In 59th Appita Annual Conference and Exhibition: Incorporating the 13th ISWFPC (International Symposium on Wood, Fibre and Pulping Chemistry), Auckland, New Zealand, 16-19 May 2005: Proceedings. Appita. 2005. p. 311-315. (Appita Annual Conference Proceedings).

Bleaching of mechanical pulps: Implications of demethylation of pectin for pulp brightness

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