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Gewählte Doctoral Thesis:

Doctoral Thesis - Institut für Holztechnologie und Nachwachsende Rohstoffe, BOKU-Universität für Bodenkultur, pp 283. UB BOKU obvsg

Data Source: ZID Abstracts
The aim of this work was the characterisation of pine extractives and as some of these substances are converted to unwanted secondary emissions during production processes in the wood based industry the evaluation of biotechnological methods for the reduction of these substances. First the qualitative and quantitative determination of extractives common for pine species was established using Pinus nigra and Pinus sylvestris samples. The extractives pattern of these two species was almost identical except for differences in their flavonoid content. In addition a fast, IR-based, method for the quantification of extractives groups in solid wood and in wood meal was developed. With the established prediction models the resin acid, fatty acid and stilbene content of wood can be determined with a coefficient of determination higher than 90 %. In the second part of the work the degradation of extractives with wood degrading fungi was investigated. The white rot Phlebia brevispora efficiently metabolised the extractives leading to a reduction of the free fatty acid content, mainly responsible for secondary emissions between 47 % and 87 % during 30 days. The long treatment time and the reduction of the lignin content of the wood were disadvantageous for the implementation of this method in an industrial process. To overcome the disadvantages of the fungal treatment an enzymatic system based on laccase combined with a redox mediator, able to degrade extractives oxidatively, was optimised. Using the optimised enzymatic system the wood showed a higher amount of secondary emissions during the treatment but less emissions after a drying step. During this work it was shown that it is possible to reduce the amount of oxidizeable extractives with biotechnological methods. This treatment can lead to wood products with a reduced emission potential for secondary emissions

Betreuer: Hinterstoisser Barbara

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