Faculty of Biology, University of Latvia
EEB
Hard copy: ISSN 1691–8088
On-line: ISSN 2255–9582
Env Exp Biol (2013) 11: 17–22
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Environmental and
Experimental
Biology

Env Exp Biol (2013) 11: 17–22

Original Article

Biodegradation of treated softwood and hardwood species by brown rot fungi

Anna Janberga1, Ilze Irbe1, Vladimirs Biziks1, Nina Kurnosova1, Mikheil D. Asatiani2, Bruno Andersons1, Ingeborga Andersone1
1Latvian State Institute of Wood Chemistry, Dzerbenes 27, Riga LV–1006, Latvia
2Durmishidze Institute of Biochemistry and Biotechnology, Georgian Agrarian University, 10 km Agmasheneblis kheivani, Tbilisi 0159, Georgia
*Corresponding author, E-mail: aj07019@lanet.lv

Abstract

The aim of this study was to investigate enzymatic activity and biodegradation capacity of treated wood by three brown rot fungi. For measurement of enzymatic activity, the brown rot fungi Coniophora puteana, Postia placenta and Gloeophyllum trabeum were grown in solid state fermentation of wheat bran-containing medium. The highest enzymatic activity of all enzymes, i.e. 8.3 U mL–1, was detected for C. puteana-produced xylanase. The highest activity of endoglucanase, i.e. 4.4 U mL–1, was detected for P. placenta. Total cellulolytic activity showed the lowest value (0.1 U mL–1) for all the fungi under study. To improve the durability of softwoods, they were impregnated with wood preservatives Celcure AC 500 and Dikants and hydrothermally modified in two regimes, 150°C for 3 h and 160°C for 1 h. Hardwoods were hydrothermally modified at 160 °C for 1 h. The efficiency against softwood degradation by C. puteana, G. trabeum and P. placenta and that against hardwood degradation by C. puteana were determined according to the standards CEN/TS 15083-1 and EN 84. Heat treatment was more effective than chemical treatment. Hydrothermal modification by the same conditions (temperature/time) was more effective for softwoods than hardwoods.

Key words: brown rot fungi, endoglucanase, enzymatic activity, wood preservatives, wood durability, xylanase.

 
Env Exp Biol (2013) 11: 17–22
 DOI: http://doi.org/10.22364/eeb
EEB

Editor-in-Chief
Prof. Gederts Ievinsh



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University of Latvia

 
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