DIAGNOSTICS OF EARLY CHANGES IN THE PHYSICOCHEMICAL PROPERTIES OF WOOD UNDER THE IN-FLUENCE OF FUNGAL INFECTIONS
UDC 630*81:632.4
Abstract
The sound wood and damaged wood of Pinus sylvestris L. at 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 fungal hyphae in tracheids of damaged wood. The hyphae penetrated into the tracheids through the pores. The cell wall degradation was not found. The results of pyrolysis-gas chromatography/mass spectrometry revealed that lignin/carbohydrate ratio in damaged wood did not change markedly. It indicates the absence of pronounced degradation of polysaccharides or lignin at this stage of wood damage by Leptographium and Trichoderma fungi. However, a decrease in relative contents of some individual compounds in composition of flash pyrolysis products as well as the mass loss profile and the reduced activation energy of the thermal decomposition of damaged wood point to the beginning of carbohydrate complex transformation, mainly hemicelluloses. The proposed approach to the diagnosis of wood damage by fungi is highly effective, rapid and does not require complex sample preparation.
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