Elucidating Structural Characteristics of Biomass using Solution-State 2 D NMR with a Mixture of Deuterated Dimethylsulfoxide and Hexamethylphosphoramide

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• 作者：Dr. Chang Geun Yoo ; Dr. Yunqiao Pu ; Dr. Mi Li and Prof. Dr. Arthur J. Ragauskas
• 刊名：ChemSusChem
• 出版年：2016
• 出版时间：May 23, 2016
• 年：2016
• 卷：9
• 期：10
• 页码：1090-1095
• 全文大小：1240K
• ISSN：1864-564X

文摘

Recent developments of NMR methods for characterization of lignocellulosic biomass allow improved understanding of plant cell-wall structures with minimal deconstruction and modification of biomass. This study introduces a new NMR solvent system composed of dimethylsulfoxide (DMSO-d₆) and hexamethylphosphoramide (HMPA-d₁₈). HMPA as a co-solvent enhanced swelling and mobility of the biomass samples; thereby it allowed enhancing signals of NMR spectra. The structural information of biomass was successfully analyzed by the proposed NMR solvent system (DMSO-d₆/HMPA-d₁₈; 4:1, v/v) with different biomass. The proposed bi-solvent system does not require derivatization or isolation of biomass, facilitating a facile sample preparation and involving with no signals overlapping with biomass peaks. It also allows analyzing biomass with a room-temperature NMR probe instead of cryo-probes, which are traditionally used for enhancing signal intensities.