caa a22 4500 463247728 CHVBK 20180405153331.0 cr unu---uuuuu 170326e20071001xx s 000 0 eng 10.1007/s10086-007-0882-z doi (NATIONALLICENCE)springer-10.1007/s10086-007-0882-z Structural changes in lignin of tropical woods during digestion by termite, Cryptotermes brevis [Elektronische Daten] [Kyoko Katsumata, Zhenfu Jin, Keko Hori, Kenji Iiyama] Wood samples of apitong (Dipterocarpus grandiflorua) and ilang-ilang (Ilang-Ilang C. dadloyi) and feces of termites [Cryptotermes brevis (Walker)] fed on these woods were collected from University of the Philippines, Los Baňos. Lignin of each sample was isolated by Björkman's procedure. There was no significant difference in 1H nuclear magnetic resonance (NMR) spectra or in the methoxyl content between Björkman lignins from original woods and termite feces. Differences were detected in the contents of aliphatic and unconjugated phenolic hydroxyl groups, suggesting minor structural changes of lignin during digestion by termites. In addition, the ratio of syringyl to guaiacyl nuclei of Björkman lignin from termite feces determined by 1H NMR spectra was higher than those from the original woods. The molar ratio of syringyl to guaiacyl nuclei of termite feces was higher than those from the original woods as determined by alkaline nitrobenzene oxidation. These results suggest that the structural changes of lignin in the termite gut are due to the insignificant formation of C-C linkages in guaiacyl nuclei. It was concluded that there were minor changes in the structural features of lignin under mostly anaerobic conditions, in contrast to the significant changes that occur through biological modification under aerobic conditions. The Japan Wood Research Society, 2007 Dipterocarpus grandiflorua nationallicence Ilang-Ilang C. dadloyi nationallicence Cryptotermes brevis (Walker) nationallicence Termite feces nationallicence 1H and 13C NMR spectra nationallicence Katsumata Kyoko Graduate School of Agricultural and Life Sciences, the University of Tokyo, 113-8657, Tokyo, Japan aut Jin Zhenfu Graduate School of Agricultural and Life Sciences, the University of Tokyo, 113-8657, Tokyo, Japan aut Hori Keko Graduate School of Agricultural and Life Sciences, the University of Tokyo, 113-8657, Tokyo, Japan aut Iiyama Kenji Asian Natural Environmental Science Center, the University of Tokyo, 113-0033, Tokyo, Japan aut Journal of Wood Science Springer-Verlag 53/5(2007-10-01), 419-426 1435-0211 53:5<419 2007 53 10086 https://doi.org/10.1007/s10086-007-0882-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10086-007-0882-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Katsumata Kyoko Graduate School of Agricultural and Life Sciences, the University of Tokyo, 113-8657, Tokyo, Japan aut NATIONALLICENCE 700 1- Jin Zhenfu Graduate School of Agricultural and Life Sciences, the University of Tokyo, 113-8657, Tokyo, Japan aut NATIONALLICENCE 700 1- Hori Keko Graduate School of Agricultural and Life Sciences, the University of Tokyo, 113-8657, Tokyo, Japan aut NATIONALLICENCE 700 1- Iiyama Kenji Asian Natural Environmental Science Center, the University of Tokyo, 113-0033, Tokyo, Japan aut NATIONALLICENCE 773 0- Journal of Wood Science Springer-Verlag 53/5(2007-10-01), 419-426 1435-0211 53:5<419 2007 53 10086 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer