Enzymatic hydrolosis of isolated and fibre-bound galactoglucomannans from pine-wood and pine kraft pulp

Marjaana Rättö, Matti Siika-aho, Johanna Buchert, Anne Valkeajärvi, Liisa Viikari

Research output: Contribution to journalArticleScientificpeer-review

48 Citations (Scopus)

Abstract

Fibre-bound and isolated galactoglumanans from pine-wood and pine kraft pulp were hydrolysed with purified mannanases from Trichoderma reesei and Bacillus subtilis. The isolated galactoglucomannans from both wood and pulp could be hydrolysed fairly extensively with both enzymes. In addition to mixed oligomers, the fungal mannase produced mannobiose as the main hydrolysis product whereas the bacterial mannanase produced mannobiose, mannotriose and mannotetraose. Both enzymes hydrolysed the native galactoglucomannan in finely ground pinewood, whereas galactoglucomannan in pine kraft pulp was only hydrolysed by the T. ressei mannanase. Thus, mannanases exhibit different specificities on fibre-bound, modified substrates. In spite of the high enzyme loading, the degree of hydrolysis of fibre-bound substrates did not exceed 10% of the theoretical, probably due to poor accessibility of the substrates.

Original languageEnglish
Pages (from-to)449 - 454
Number of pages6
JournalApplied Microbiology and Biotechnology
Volume40
Issue number2-3
DOIs
Publication statusPublished - 1993
MoE publication typeA1 Journal article-refereed

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