Changes in thioacidolysis products of lignin in wheat straw as affected by SO2 treatment and passage through the gastro-intestine of sheep |
| |
| Institution: | 1. Department of Plastic and Reconstructive Surgery, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan;2. Department of Science of Nursing Practice, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan;3. Department of Medical Microbiology, Mycology and Immunology, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan;4. Department of Intelligent Network for Infection Control, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan;5. Department of Molecular Immunology, Medical Mycology Research Center, Chiba University, Chuo-ku, Chiba, Japan;6. Division of Laboratory Animals, Research Institute for Biomedical Sciences, Tokyo University of Science, Noda, Chiba, Japan;1. Faculty of Engineering Modern Technologies, Amol University of Special Modern Technologies, Amol, Iran;2. Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran;1. MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China;2. Dr. Li Dak Sum & Yip Yio Chin Center for Stem Cell and Regenerative Medicine, Zhejiang University, Hangzhou 310030, China;1. Department of Thoracic Surgery, Siirt State Hospital, Siirt, Turkey;2. Department of Thoracic Surgery, Ataturk Training and Research Hospital for Chest Disease and Chest Surgery, Ankara, Turkey |
| |
| Abstract: | Sheep were fed two rations based on untreated (WS) and SO2-treated (SO2–WS) wheat straw. The neutral detergent fiber (NDF) preparations and water soluble lignins (WSL) isolated from straws, rumen liquor and feces were subjected to thioacidolysis, to study the effect of treatment and passage through the gastro-intestine on monolignol composition of the lignins. SO2 treatment affected guaiacyl (G) and syringyl (S) contents of the straw cell walls with major effect on S, reducing G to 66% and S to 26% of their original concentrations, thus changing the S/G ratio in the CW fraction from 1.6 in WS to 0.64 in SO2–WS. Concomitantly, as a reflection of the above-mentioned there was an increase in the S/G ratio of the WSL, from 0.54 in WS to 1.27 in SO2–WS. Fecal CW residues were richer in p-hydroxyphenyl (H), G and S as compared with the original straw cell walls; the gap being particularly large in the SO2–WS treatment in which the concentrations of monolignols in CW residues were increased by more than ten-fold. The concentration of WSL in the rumen of sheep fed the SO2–WS ration was about eight-fold that found in the rumen of the WS sheep, most likely a result of the combined chemical (SO2) and digestive (rumen microorganisms) effects. Most G and S were found in the CW fraction of the untreated straw, whereas in the SO2-treated straw, the majority of G and S were in the water soluble lignin fraction. In the untreated wheat straw ration (WS), 25.7% of G and 36.6% of S disappeared from the digestive tract. Feed CW-G was higher by 18% and feed CW-S by 60% than the respective fecal CW components in the WS treatment, accompanied by only modest quantitative changes between feed and feces, in the G and S components of WSL. In the SO2–WS treatment, CW-G was increased from 3.48 to 6.26 g/day (by 80%) and CW-S from 2.58 to 6.56 g/day (by 154%) between feed and feces. The digestibility of total acetyl bromide lignin (ABL) was in accord with that of the monolignol data namely, a small proportion (11.4%) of total ABL disappeared from the gastro-intestine of the WS sheep, but a minor, almost negligible percentage (2.94%) of the ABL was digested by the SO2–WS sheep. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
