Počet záznamov: 1
Changes in the chemical composition of oak wood due to steaming
SYS 0100714 LBL 00000naa^^22^^^^^^^^450 005 20190402102618.4 017 70
$a 10.17423/afx.2019.61.1.02 $2 DOI 100 $a 20190402a m y0sloy0103 ba 101 0-
$a eng 102 $a SK 200 1-
$a Changes in the chemical composition of oak wood due to steaming $f Anton Geffert, Eva Výbohová, Jarmila Geffertová 215 $c Obr., tab. 320 $a Lit. 330 $a 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. 463 -1
$1 001 sldk_un_cat*0100704 $1 011 $a 1336-3824 $1 200 1 $a Acta Facultatis Xylologiae Zvolen $e vedecký časopis Drevárskej fakulty $v Vol. 61, no. 1 (2019), s. 19-29 $1 210 $a Zvolen $c Technická univerzita vo Zvolene $d 2019 610 1-
$9 sldk_un_auth*h006549 $a dubové drevo $X oak wood 610 1-
$9 sldk_un_auth*h002809 $a parenie dreva $X steaming of wood 610 1-
$9 sldk_un_auth*h012385 $a extraktívne látky $X extractives 610 1-
$9 sldk_un_auth*h008758 $a celulóza $X cellulose 610 1-
$9 sldk_un_auth*h007595 $a lignín $X lignin 610 1-
$9 sldk_un_auth*h010006 $a holocelulóza $X holocellulose 610 1-
$9 sldk_un_auth*h011056 $a FTIR spektroskopia $X FTIR spectroscopy 675 $a 630*81 $v 1. stred. $z slo 675 $a 630*846 $v 1. stred. $z slo 675 $a 547.458.81 $v 1. stred. $z slo 675 $a 630*864.4 $v 1. stred. $z slo 700 -1
$3 sldk_un_auth*p0016647 $a Geffert $b Anton $f 1955- $p TUZDFCHTD $4 070 $T Katedra chémie a chemických technológií 701 -1
$3 sldk_un_auth*p0046221 $a Výbohová $b Eva $f 1974- $p TUZDFCHTD $4 070 $T Katedra chémie a chemických technológií 701 -1
$3 sldk_un_auth*p0039105 $a Geffertová $b Jarmila $f 1956- $p TUZDFCHTD $4 070 $T Katedra chémie a chemických technológií 801 -0
$a SK $b ZV001 $c 20190402 $g AACR2 856 4-
$u https://df.tuzvo.sk/sites/default/files/02-01-19.pdf
Počet záznamov: 1