Changes in the supramolecular structures of cellulose after hydrolysis studied by terahertz spectroscopy and other methods

被引:22
作者
Guo, Hong [1 ]
He, Mingxia [2 ]
Huang, Renliang [3 ]
Qi, Wei [1 ,4 ]
Guo, Weihua [1 ]
Su, Rongxin [1 ,4 ]
He, Zhimin [1 ]
机构
[1] Tianjin Univ, State Key Lab Chem Engn, Tianjin Key Lab Membrane Sci & Desalinat Technol, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China
[2] Tianjin Univ, Coll Precis Instrument & Optoelect Engn, Tianjin 300072, Peoples R China
[3] Tianjin Univ, Sch Environm Sci & Engn, Tianjin 300072, Peoples R China
[4] Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China
基金
中国国家自然科学基金;
关键词
HYDROGEN-BOND NETWORK; ENZYMATIC-HYDROLYSIS; SODIUM-HYDROXIDE; CRYSTALLINITY; LIGNOCELLULOSE; FEATURES; DIGESTIBILITY; CONFORMATION; CONVERSION; SPECTRA;
D O I
10.1039/c4ra08314h
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Hydrogen bonding is one of dominant forces in crystalline cellulose and lignocellulose, however, it is still a big challenge to evaluate the changes in the hydrogen bonding strength. Here, we reported a new method for measuring the changes in the hydrogen bonding strength of cellulose-based materials by terahertz time domain spectroscopy (THz-TDS). Avicel, corncob and their residual substrates after enzymatic hydrolysis were chosen as the targeted cellulose to demonstrate this method. THz adsorption in the range 0.5-2.5 THz and refractive index in the range 0.5-1.0 THz provided a direct signal corresponding to an increase in the hydrogen bonding strength for the residual samples (Avicel and corncob) after enzymatic hydrolysis. The THz results were further compared with those obtained from X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analysis. As a quick and non-invasive technique, THz spectroscopy provides unique information about the changes in the hydrogen bonding strength of cellulose-based materials. Therefore, it is a promising way to directly evaluate the hydrogen bonding strength of cellulosic macromolecules.
引用
收藏
页码:57945 / 57952
页数:8
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