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杨增玲,梅佳琪,曹聪,纪冠亚,韩鲁佳.基于红外光谱的不同农作物秸秆磨木木质素差异表征[J].农业工程学报,2018,34(19):219-224.DOI:10.11975/j.issn.1002-6819.2018.19.028
基于红外光谱的不同农作物秸秆磨木木质素差异表征
投稿时间:2018-04-04  修订日期:2018-08-08
中文关键词:  秸秆  作物  光谱分析  磨木木质素  红外光谱
基金项目:国家自然科学基金(31471407);教育部创新团队计划(IRT_17R105)
作者单位
杨增玲 中国农业大学工学院北京 100083 
梅佳琪 中国农业大学工学院北京 100083 
曹聪 中国农业大学工学院北京 100083 
纪冠亚 中国农业大学工学院北京 100083 
韩鲁佳 中国农业大学工学院北京 100083 
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中文摘要:木质素是植物细胞壁中主要组分之一,其苯丙烷结构单元的单体结构和连接方式的复杂性直接影响木质素脱除和利用效果,了解不同农作物秸秆中木质素的差异,对提高秸秆的综合利用效率是非常必要的。该文选取代表性棉秆、玉米秸和小麦秆,分别提取磨木木质素,利用傅里叶变换中红外技术对棉秆、玉米秸和小麦秆三类秸秆磨木木质素进行红外表征,分析比较三类秸秆磨木木质素的差异,结果表明:1)三类秸秆磨木木质素G/S相对比值差别不大,并无明显规律;2)三类秸秆磨木木质素中,对羟基结构单元:玉米秸>小麦秆>>棉秆;愈创木基结构单元:棉秆>玉米秸>小麦秆;紫丁香基结构单元:玉米秸>小麦秆>棉秆;3)玉米秸和小麦秆磨木木质素相似度较高,而棉秆磨木木质素则更加接近于木本植物。
Yang Zengling,Mei Jiaqi,Cao Cong,Ji Guanya,Han Lujia.Traits of milled wood lignin isolated from different crop straw based on FT-IR[J].Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE),2018,34(19):219-224.DOI:10.11975/j.issn.1002-6819.2018.19.028
Traits of milled wood lignin isolated from different crop straw based on FT-IR
Author NameAffiliation
Yang Zengling College of Engineering, China Agricultural University, Beijing 100083, China 
Mei Jiaqi College of Engineering, China Agricultural University, Beijing 100083, China 
Cao Cong College of Engineering, China Agricultural University, Beijing 100083, China 
Ji Guanya College of Engineering, China Agricultural University, Beijing 100083, China 
Han Lujia College of Engineering, China Agricultural University, Beijing 100083, China 
Key words:straw  crops  spectrum analysis  milled wood lignin  FT-IR
Abstract: As vast agricultural byproduct and an important source of lignocellulosic biomass in China, straws of maize, cotton and wheat are now being developed as renewable energy resources to address a serious energy shortage and environmental issues related to other energy sources. It is necessary to improve the comprehensive utilization efficiency of the three types of straw. Although maize (monocotyledon), cotton (dicotyledon) and wheat (monocotyledon) belong to therophyte herbage from the perspective of phytology, but their straw forms are totally different. For the sake of the difference among them, the utilization cannot be generalized without regard to the effect of chemical composition, in particular the characteristics of lignin. It is composed of phenyl propane monomers connected by the ether and carbon-carbon bonds, containing a variety of active groups. There are three types of phenylpropane, p-hydroxy phenyl, guaiacyl and syringyl, which correspond to hydroxy phenyl lignin (H-lignin), syringyl lignin (S-lignin) and guaiacyl lignin (G-lignin), respectively. Lignin within plants has different shares of the three constitutional units. The heterogeneity of linkage types among the phenyl propane monomers has different effects on the pretreatment for the utilization and removal of lignin. Previous researches have shown that the relative ratio of G-lignin/S-lignin (G/S value) is relevant to the ease or complexity of delignification. Therefore, the higher the ratio, the harder the delignification is. In this paper, three samples of each kind of straw were collected, coarse grinded, degreased, dewaxed, and fine grinded, in sequence. Then the milled wood lignin (MWL) was isolated from the straws of cotton, corn and wheat. After the all procedures above, MWL was studied with FT-IR, by potassium bromide pellet technique. Normalization was conducted with 9 spectra obtained, at the wavelength of 1 506 cm-1 (to make A1 506=1) as spectral pretreatment. Then the spectra were compared in 3 aspects: the relative G/S ratio represented by A1 265/A1 329, the identification of lignin types based on plant taxonomy, and the differences and similarities comparing with the MWL from eucalyptus. The results indicate that there is more guaiacyl and less syringyl in the MWL isolated from the samples, the relative ratio of G/S among the three kinds of straws was not significant difference, and no evident regularity is found. Secondly, the identification results based on plant taxonomy show that the MWL from cotton straw is the type of GS1, while that from corn and wheat straw belong to the type of HGS; the content of basic units of lignin in mole percent in these straws have following laws: for H-lignin, corn straw>wheat straw>>cotton straw; for G-lignin, cotton straw>corn straw>wheat straw; for S-lignin, corn straw>wheat straw>cotton straw. Thirdly, the MWL isolated from straw of corn and wheat share the generality of gramineous plants, while the MWL from cotton straw is closer to ligneous plants, which have distinguish peak at 1 265 and 1 226 cm-1.
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