Тип публикации: статья из журнала
Год издания: 2023
Идентификатор DOI: 10.1134/s1068162023070762
Ключевые слова: wood, Pinus sylvestris L., fungal decay, physicochemical properties, biochemistry, general, bioorganic chemistry, organic chemistry, biomedicine
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 Показать полностьюdamaged 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.
Журнал: Russian Journal of Bioorganic Chemistry
Выпуск журнала: Т. 49, № 7
Номера страниц: 1618-1627
ISSN журнала: 10681620
Место издания: Moscow
Издатель: Pleiades Publishing, Ltd.