caa a22 4500 463247256 CHVBK 20180405153329.0 cr unu---uuuuu 170326e20071201xx s 000 0 eng 10.1007/s10086-007-0894-8 doi (NATIONALLICENCE)springer-10.1007/s10086-007-0894-8 Residual extractives in aspen kraft pulps and their impact on kappa number and Klason lignin determination [Elektronische Daten] [Soo-Jeong Shin, Nam-Seok Cho, Yuan-Zong Lai] We investigated the impact of residual extractives on lignin determination by lignin content difference between unextracted and extracted pulps, residual extractives analysis, and lignin content contribution from model extractive compounds. There were two different kinds of extractives in aspen kraft pulp. The extractives impacting on kappa number determination were well removed in oxygen delignification; these were mainly unsaturated fatty acids. However, the extractives impacting on Klason lignin determination were largely resistant to oxygen delignification; these were mainly saturated fatty acids, sterols, and hydrocarbons. Oxidation of unsaturated fatty acids was the main reaction in oxygen delignification. These trends were confirmed by simulation of lignin content determination with three model extractive compounds (β-sitosterol, linoleic acid, and palmitic acid). The Japan Wood Research Society, 2007 Extractives nationallicence Kraft pulps nationallicence Oxygen-delignified pulps nationallicence Kappa number nationallicence Klason lignin nationallicence Shin Soo-Jeong Faculty of Paper Science and Engineering, State University of New York, College of Environmental Science and Forestry (SUNY-ESF), 13210, New York, USA aut Cho Nam-Seok Wood and Paper Science, School of Forest Resources, and Rural Engineering, Chungbuk National University, 361-763, Cheongju, Chungbuk, Korea aut Lai Yuan-Zong Faculty of Paper Science and Engineering, State University of New York, College of Environmental Science and Forestry (SUNY-ESF), 13210, New York, USA aut Journal of Wood Science Springer-Verlag 53/6(2007-12-01), 494-497 1435-0211 53:6<494 2007 53 10086 https://doi.org/10.1007/s10086-007-0894-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10086-007-0894-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shin Soo-Jeong Faculty of Paper Science and Engineering, State University of New York, College of Environmental Science and Forestry (SUNY-ESF), 13210, New York, USA aut NATIONALLICENCE 700 1- Cho Nam-Seok Wood and Paper Science, School of Forest Resources, and Rural Engineering, Chungbuk National University, 361-763, Cheongju, Chungbuk, Korea aut NATIONALLICENCE 700 1- Lai Yuan-Zong Faculty of Paper Science and Engineering, State University of New York, College of Environmental Science and Forestry (SUNY-ESF), 13210, New York, USA aut NATIONALLICENCE 773 0- Journal of Wood Science Springer-Verlag 53/6(2007-12-01), 494-497 1435-0211 53:6<494 2007 53 10086 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer