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6927804 
Journal Article 
WOOD CHEMICAL COMPOSITION OF SELECTED FAST GROWING SPECIES TREATED WITH NAOH PART II: NON-STRUCTURAL SUBSTANCES 
Doczekalska, B; Zborowska, M; , 
2010 
1 
Wood Research
ISSN: 1336-4561 
STATE FOREST PRODUCTS RESEARCH INST 
BRATISLAVA 
83-92 
WOS:000284027900008 
In this study was to determine the impact of sodium hydroxide concentrations and duration of treatment on the non-structural constituents of two fast growing wood species: willow (Salix viminalis) and poplar. Alkalisation of willow and poplar wood with sodium hydroxide solutions of 10 to 20% concentrations resulted in the removal of significant quantities of wood non-structural substances. The content of substances soluble in the ethanol-benzene mixture from willow wood treated with NaOH decreased by about 80%, in cold water by about 90%, in hot water by about 45% and in 1% NaOH solution by about 50%. Smaller changes in the content of these constituents were determined in poplar wood: substances soluble in organic solvents declined by approximately 40% and substances soluble in 1% NaOH by about 30%. The highest mass losses for both of the examined wood species were recorded in the lignocellulosic material after treatment with 10% NaOH. The duration of treatment with solutions of sodium hydroxide failed to exert a significant influence on quantitative changes in the examined constituents.