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Changes in the chemical composition of oak wood due to steaming
Názov Changes in the chemical composition of oak wood due to steaming Aut.údaje Anton Geffert, Eva Výbohová, Jarmila Geffertová Autor Geffert Anton TUZDFCHTD - Katedra chémie a chemických technológií Spoluautori Výbohová Eva TUZDFCHTD - Katedra chémie a chemických technológií Geffertová Jarmila TUZDFCHTD - Katedra chémie a chemických technológií Zdroj.dok. Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. Vol. 61, no. 1 (2019), s. 19-29. - Zvolen : Technická univerzita vo Zvolene, 2019 Poznámky Lit. Jazyk dok. angličtina Krajina Slovenská republika Systematika 630*81 630*846 547.458.81 630*864.4 Heslá dubové drevo - oak wood * parenie dreva - steaming of wood * extraktívne látky - extractives * celulóza - cellulose * lignín - lignin * holocelulóza - holocellulose * FTIR spektroskopia - FTIR spectroscopy Anotácia Monitoring the chemical changes resulting from hydrothermal treatment of English oak (Quercus robur L.) through various steaming modesis presented in the paper. The greatest changes were observedin the polysaccharide content (holocellulose). In the most extreme steaming treatment in mode III (tmax140 °C, total duration for 7.5 h), the decrease in their content was the most dramaticreaching approximately 36%. This decrease is the result of degradation of the most labile hemicelluloses. Only minimal changes in cellulose and lignin content were observed, and several concurrent effects result in theslight increase and decrease in individual modes.Firstly, the content of extractives decreased slightly, but with increasing temperature and extended steaming period a considerable increase in their content occurred. In the initial stages of steaming,new carbonyl and carboxyl groups in carbohydrates are formed by oxidation. Consequently, the deacetylation and degradation of hemicelluloses occurred. In addition, the decrease in the crystallinity of cellulose due to steaming was observed. URL https://df.tuzvo.sk/sites/default/files/02-01-19.pdf Kategória publikačnej činnosti ADN Báza dát xcla - ČLÁNKY Druh dok. RBX - rozpis článkov z periodík Odkazy PERIODIKÁ-Súborný záznam periodika Zväzky 2019: 1-2 
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Počet záznamov: 1