Structural characterization of switchgrass lignin after ethanol organosolv pretreatment

Gang Hu; Carolina Cateto; Yunqiao Pu; Reichel Samuel; Arthur J. Ragauskas

doi:10.1021/ef201477p

Structural characterization of switchgrass lignin after ethanol organosolv pretreatment

Gang Hu, Carolina Cateto, Yunqiao Pu, Reichel Samuel, Arthur J. Ragauskas

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131 Scopus citations

Abstract

Kanlow switchgrass was subjected to aqueous ethanol organosolv pretreatment, and ethanol organosolv lignin (EOL) was recovered through precipitation of pretreatment effluents. Ball-milled switchgrass lignin was also isolated from unpretreated and pretreated switchgrass. The obtained switchgrass lignins were characterized using Fourier transform infrared (FTIR) spectroscopy, ³¹P nuclear magnetic resonance (NMR), two-dimensional (2D) heteronuclear single-quantum coherence (HSQC) NMR spectroscopy, and gel permeation chromatography (GPC). The results showed that the molecular weight of switchgrass EOL lignin decreased while polydispersity increased. The pretreatment resulted in an increase of free phenolic guaiacyl and syringyl units and a decrease of the β-O-4 linkage content.

Original language	English
Pages (from-to)	740-745
Number of pages	6
Journal	Energy and Fuels
Volume	26
Issue number	1
DOIs	https://doi.org/10.1021/ef201477p
State	Published - Jan 19 2012
Externally published	Yes

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title = "Structural characterization of switchgrass lignin after ethanol organosolv pretreatment",

abstract = "Kanlow switchgrass was subjected to aqueous ethanol organosolv pretreatment, and ethanol organosolv lignin (EOL) was recovered through precipitation of pretreatment effluents. Ball-milled switchgrass lignin was also isolated from unpretreated and pretreated switchgrass. The obtained switchgrass lignins were characterized using Fourier transform infrared (FTIR) spectroscopy, 31P nuclear magnetic resonance (NMR), two-dimensional (2D) heteronuclear single-quantum coherence (HSQC) NMR spectroscopy, and gel permeation chromatography (GPC). The results showed that the molecular weight of switchgrass EOL lignin decreased while polydispersity increased. The pretreatment resulted in an increase of free phenolic guaiacyl and syringyl units and a decrease of the β-O-4 linkage content.",

author = "Gang Hu and Carolina Cateto and Yunqiao Pu and Reichel Samuel and Ragauskas, {Arthur J.}",

year = "2012",

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doi = "10.1021/ef201477p",

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T1 - Structural characterization of switchgrass lignin after ethanol organosolv pretreatment

AU - Hu, Gang

AU - Cateto, Carolina

AU - Pu, Yunqiao

AU - Samuel, Reichel

AU - Ragauskas, Arthur J.

PY - 2012/1/19

Y1 - 2012/1/19

N2 - Kanlow switchgrass was subjected to aqueous ethanol organosolv pretreatment, and ethanol organosolv lignin (EOL) was recovered through precipitation of pretreatment effluents. Ball-milled switchgrass lignin was also isolated from unpretreated and pretreated switchgrass. The obtained switchgrass lignins were characterized using Fourier transform infrared (FTIR) spectroscopy, 31P nuclear magnetic resonance (NMR), two-dimensional (2D) heteronuclear single-quantum coherence (HSQC) NMR spectroscopy, and gel permeation chromatography (GPC). The results showed that the molecular weight of switchgrass EOL lignin decreased while polydispersity increased. The pretreatment resulted in an increase of free phenolic guaiacyl and syringyl units and a decrease of the β-O-4 linkage content.

AB - Kanlow switchgrass was subjected to aqueous ethanol organosolv pretreatment, and ethanol organosolv lignin (EOL) was recovered through precipitation of pretreatment effluents. Ball-milled switchgrass lignin was also isolated from unpretreated and pretreated switchgrass. The obtained switchgrass lignins were characterized using Fourier transform infrared (FTIR) spectroscopy, 31P nuclear magnetic resonance (NMR), two-dimensional (2D) heteronuclear single-quantum coherence (HSQC) NMR spectroscopy, and gel permeation chromatography (GPC). The results showed that the molecular weight of switchgrass EOL lignin decreased while polydispersity increased. The pretreatment resulted in an increase of free phenolic guaiacyl and syringyl units and a decrease of the β-O-4 linkage content.

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JO - Energy and Fuels

JF - Energy and Fuels

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Structural characterization of switchgrass lignin after ethanol organosolv pretreatment

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