Библиографическое описание:Diagnostics of Early Changes in the Physicochemical Properties of Wood under the Influence of Fungal Infections : научное издание / S. R. Loskutov, O. A. Shapchenkova, E. A. Petrunina [et al.]. - Текст : непосредственный // Russian Journal of Bioorganic Chemistry. - 2023. - Т. 49, № 7. - P. 1618-1627. - This work was supported by regular institutional funding, and no additional grants were obtained. - ISSN 1068-1620. - ISSN 1608-330X, DOI 10.1134/s1068162023070762.
Аннотация:The sound wood and damaged wood of<i> Pinus sylvestris</i> L. in an early stage of the development of a fungal infection were studied using scanning electron microscopy, thermogravimetry, and pyrolysis-gas chromatography/mass spectrometry. Scanning electron microscopy showed the presence of <i>fungal</i> hyphae in tracheids of the damaged wood. The hyphae penetrated into the tracheids through the pores. The cell wall degradation was not found. Quantitative indicators of the impact of fungal infection on wood were derived from analysis of the thermogravimetric data on the fourth derivative of the rate of mass loss and on the activation energy in the framework of the Ozawa-Flynn-Wall isoconversion model. Pyrolysis-gas chromatography/mass spectrometry analysis showed that the lignin/carbohydrate ratio in the damaged wood did not change markedly. This indicates the absence of pronounced degradation of polysaccharides or lignin in the early stage of wood degradation by <i>Leptographium</i> and <i>Trichoderma</i> fungi. However, a decrease in the relative contents of some individual compounds from among the flash pyrolysis products, as well as the changed mass loss profile and the reduced activation energy of the thermal degradation of the damaged wood point to the onset of transformation of the carbohydrate complex, mainly of hemicelluloses. The proposed approach to the diagnostics of the wood damage caused by fungi is highly effective, rapid, and does not require complex sample preparation.
