期刊
ANALYTICA CHIMICA ACTA
卷 706, 期 1, 页码 164-170出版社
ELSEVIER
DOI: 10.1016/j.aca.2011.08.031
关键词
1064 nm dispersive multichannel Raman spectrometer; Lignin monomer composition; p-Hydroxyphenyl; Guaiacyl; Syringyl; Partial least squares
资金
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences through the Ames Laboratory
- U.S. Department of Energy by Iowa State University [DE-AC02-07CH11358]
- U.S. Department of Education
The mixed phenylpropanoid polymer lignin is one of the most abundant biopolymers on the planet and is used in the paper, pulp and biorenewable industries. For many downstream applications, the lignin monomeric composition is required, but traditional methods for performing this analysis do not necessarily represent the lignin composition as it existed in the plant. Herein, it is shown that Raman spectroscopy can be used to measure the lignin monomer composition. The use of 1064 nm excitation is needed for lignin analyses since high fluorescence backgrounds are measured at wavelengths as long as 785 nm. The instrument used for these measurements is a 1064 nm dispersive multichannel Raman spectrometer that is suitable for applications outside of the laboratory, for example in-field or in-line analyses and using remote sensing fiber optics. This spectrometer has the capability of acquiring toluene/acetonitrile spectra with 800 cm(-1) spectral coverage, 6.5 cm(-1) spectral resolution and 54 S/N ratio in 10 s using 280 mW incident laser powers. The 1135-1350 cm(-1) and 1560-1650 cm(-1) regions of the lignin spectrum can be used to distinguish among the three primary model lignin monomers: coumaric, ferulic and sinapic acids. Mixtures of the three model monomers and first derivative spectra or partial least squares analysis of the phenyl ring breathing modes around 1600 cm are used to determine sugarcane lignin monomer composition. Lignin extracted from sugarcane is shown to have a predominant dimethoxylated and monomethoxylated phenylpropanoid content with a lesser amount of non-methoxylated phenol, which is consistent with sugarcane's classification as a non-woody angiosperm. The location of the phenyl ring breathing mode peaks do not shift in ethanol, methanol, isopropanol, 1,4 dioxane or acetone. Published by Elsevier B.V.
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