Instrumental analyses of constituent biopolymers in cypress after various chemical treatments for delignification

柏树 化学 植物 生物
作者
Mitsuru Abe,Yuko Yashima,Masako Seki,Tsunehisa Miki,Masakazu Nishida
出处
期刊:Industrial Crops and Products [Elsevier BV]
卷期号:212: 118327-118327
标识
DOI:10.1016/j.indcrop.2024.118327
摘要

To evaluate delignification as a pre-treatment for manufacturing processes, the chemical structure and composition of constituent polymers of Japanese cypress (Chamaecyparis obtusa) after chemical treatments (oxidation, solvent extraction, and alcoholysis) were investigated using a combination of attenuated total reflection infrared spectroscopy and 13C cross-polarization (CP)/ magic angle spinning (MAS) nuclear magnetic resonance (NMR) methods. Oxidation by the Klaudiz method selectively removed lignin despite a small weight loss (∼ 3.8%) because the active site of the reaction was at the terminal end of lignin. However, solvent extraction (dimethyl sulfoxide, ionic liquid, and dioxane) and alcoholysis simultaneously removed lignin and hemicellulose because the active sites of the reaction were at the interface between the lignin and hemicellulose, and the selectivity of the removed components was low. The effects of the reaction temperature and addition of acid were significant for chemical treatment, particularly for alcoholysis with acid (weight loss: from 1.7 to 52%), which removed most of the hemicellulose and lignin, resulting in increased cellulose crystallinity (13C CP/MAS crystalline/amorphous ratio: from 1.27 to 1.58). The removal of hemicellulose during lignification decreased the hydrophilicity, as evaluated by 1H MAS NMR, and increased the 1H spin-lattice relaxation time (T1H), revealing the higher affinity of hemicellulose for water. The 1H signal intensity was reduced to 0.62 in the dimethyl sulfoxide extraction at 150 °C compared to the untreated sample, and the T1H value increased to 1.6 s in the dioxane extraction with acid compared to 1.2 s in the untreated sample. Thermogravimetric and dynamic mechanical analyses indicated that the change in thermal behavior at lower temperatures required selectivity for delignification unless a significant amount of the hemicellulose was removed, such as during alcoholysis, where the acid demonstrated a lower maximum thermal decomposition temperature (329 °C). In actual manufacturing processes, these delignification methods should be used depending on the desired processing temperature.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
Erislastem发布了新的文献求助10
刚刚
852应助aha采纳,获得10
刚刚
Zzong完成签到,获得积分10
2秒前
LY完成签到,获得积分10
2秒前
华仔应助11111采纳,获得10
4秒前
4秒前
123完成签到 ,获得积分10
4秒前
adi发布了新的文献求助10
5秒前
共享精神应助务实的大神采纳,获得10
5秒前
8秒前
十有五完成签到,获得积分10
8秒前
Leslie应助正正采纳,获得10
8秒前
Erislastem完成签到,获得积分10
9秒前
CZLhaust发布了新的文献求助10
10秒前
完美世界应助WXP采纳,获得10
11秒前
趣多多发布了新的文献求助30
11秒前
重要灵寒发布了新的文献求助10
11秒前
11秒前
日富一日的fighter完成签到,获得积分10
11秒前
aha发布了新的文献求助10
12秒前
等待日记本完成签到 ,获得积分10
13秒前
李健的小迷弟应助竹简采纳,获得10
16秒前
重要灵寒完成签到,获得积分10
16秒前
16秒前
等等发布了新的文献求助10
16秒前
小马甲应助巴黎的防采纳,获得10
17秒前
17秒前
18秒前
CZLhaust完成签到,获得积分10
18秒前
齐阳春完成签到 ,获得积分10
19秒前
玻璃杯完成签到,获得积分10
20秒前
共享精神应助aaaaaaaa采纳,获得10
20秒前
lyla发布了新的文献求助10
21秒前
脑洞疼应助等等采纳,获得10
21秒前
ZLX完成签到,获得积分20
23秒前
莫等闲191发布了新的文献求助10
24秒前
哈哈哈发布了新的文献求助10
24秒前
义气沉鱼关注了科研通微信公众号
24秒前
不知道完成签到,获得积分10
26秒前
FashionBoy应助科研通管家采纳,获得10
28秒前
高分求助中
Ophthalmic Equipment Market by Devices(surgical: vitreorentinal,IOLs,OVDs,contact lens,RGP lens,backflush,diagnostic&monitoring:OCT,actorefractor,keratometer,tonometer,ophthalmoscpe,OVD), End User,Buying Criteria-Global Forecast to2029 2000
A new approach to the extrapolation of accelerated life test data 1000
Cognitive Neuroscience: The Biology of the Mind 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 588
不知道标题是什么 500
A Preliminary Study on Correlation Between Independent Components of Facial Thermal Images and Subjective Assessment of Chronic Stress 500
Technical Brochure TB 814: LPIT applications in HV gas insulated switchgear 500
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3962475
求助须知:如何正确求助?哪些是违规求助? 3508497
关于积分的说明 11141410
捐赠科研通 3241254
什么是DOI,文献DOI怎么找? 1791445
邀请新用户注册赠送积分活动 872863
科研通“疑难数据库(出版商)”最低求助积分说明 803417