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红外自由电子激光对木质素的降解

Degradation of Lignin by Infrared Free Electron Laser.

作者信息

Kawasaki Takayasu, Zen Heishun, Sakai Takeshi, Sumitomo Yoske, Nogami Kyoko, Hayakawa Ken, Yaji Toyonari, Ohta Toshiaki, Nagata Takashi, Hayakawa Yasushi

机构信息

Accelerator Laboratory, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba 305-0801, Ibaraki, Japan.

Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Kyoto, Japan.

出版信息

Polymers (Basel). 2022 Jun 14;14(12):2401. doi: 10.3390/polym14122401.

DOI:10.3390/polym14122401
PMID:35745977
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9227113/
Abstract

Lignin monomers have attracted attention as functional materials for various industrial uses. However, it is challenging to obtain these monomers by degrading polymerized lignin due to the rigid ether linkage between the aromatic rings. Here, we propose a novel approach based on molecular vibrational excitation using infrared free electron laser (IR-FEL) for the degradation of lignin. The IR-FEL is an accelerator-based pico-second pulse laser, and commercially available powdered lignin was irradiated by the IR-FEL under atmospheric conditions. Synchrotron-radiation infrared microspectroscopy analysis showed that the absorption intensities at 1050 cm, 1140 cm, and 3400 cm were largely decreased alongside decolorization. Electrospray ionization mass chromatography analysis showed that coumaryl alcohol was more abundant and a mass peak corresponding to hydrated coniferyl alcohol was detected after irradiation at 2.9 μm (νO-H) compared to the original lignin. Interestingly, a mass peak corresponding to vanillic acid appeared after irradiation at 7.1 μm (νC=C and νC-C), which was supported by our two-dimensional nuclear magnetic resonance spectroscopy analysis. Therefore, it seems that partial depolymerization of lignin can be induced by IR-FEL irradiation in a wavelength-dependent manner.

摘要

木质素单体作为用于各种工业用途的功能材料已引起关注。然而，由于芳香环之间存在刚性醚键，通过降解聚合木质素来获得这些单体具有挑战性。在此，我们提出一种基于使用红外自由电子激光（IR-FEL）进行分子振动激发的新方法来降解木质素。IR-FEL是一种基于加速器的皮秒脉冲激光，在大气条件下用IR-FEL照射市售的木质素粉末。同步辐射红外显微光谱分析表明，随着脱色，1050 cm、1140 cm和3400 cm处的吸收强度大幅降低。电喷雾电离质谱色谱分析表明，与原始木质素相比，香豆醇含量更高，并且在2.9μm（νO-H）照射后检测到对应于水合松柏醇的质量峰。有趣的是，在7.1μm（νC=C和νC-C）照射后出现了对应于香草酸的质量峰，这得到了我们二维核磁共振光谱分析的支持。因此，似乎IR-FEL照射可以以波长依赖的方式诱导木质素的部分解聚。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5632/9227113/589926fa1ed5/polymers-14-02401-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5632/9227113/cb8ab4a0197e/polymers-14-02401-g001a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5632/9227113/31774750e995/polymers-14-02401-g002a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5632/9227113/a050a6f1119e/polymers-14-02401-g003a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5632/9227113/52facc737628/polymers-14-02401-g004a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5632/9227113/589926fa1ed5/polymers-14-02401-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5632/9227113/cb8ab4a0197e/polymers-14-02401-g001a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5632/9227113/31774750e995/polymers-14-02401-g002a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5632/9227113/a050a6f1119e/polymers-14-02401-g003a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5632/9227113/52facc737628/polymers-14-02401-g004a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5632/9227113/589926fa1ed5/polymers-14-02401-g005.jpg

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