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Potential and limitations of 13C CP/MAS NMR spectroscopy to determine the lignin content of lignocellulosic feedstock
Biomass & Bioenergy ( IF 6 ) Pub Date : 2020-09-30 , DOI: 10.1016/j.biombioe.2020.105792
Daniel F. Cipriano , Luiz S. Chinelatto , Sandra A. Nascimento , Camila A. Rezende , Sonia M.C. de Menezes , Jair C.C. Freitas

Nuclear magnetic resonance (NMR) spectroscopy has been applied worldwide to study the chemical composition of lignocellulosic biomass and to analyse changes resulting from the chemical processing of these materials. In this work, solid-state 13C NMR was used to study the lignin contents of a large set of lignocellulosic materials derived from various Brazilian plant species. To determine the lignin content by NMR, the integrated intensity of the deconvoluted signal due to methoxyl groups in the 13C NMR spectra was used to obtain a calibration curve using mixtures of cellulose and lignin standards. The lignin contents obtained by NMR were, in general, in good agreement with the results obtained by methods based on acid hydrolysis (AH). For some samples, the NMR results showed that the AH methods were ineffective for the complete carbohydrate hydrolysis, indicating that the NMR-derived values represented more reliable estimates of the lignin contents in these cases.



中文翻译:

13 C CP / MAS NMR光谱法测定木质纤维素原料中木质素含量的潜力和局限性

核磁共振(NMR)光谱已在世界范围内应用,以研究木质纤维素生物质的化学组成并分析由这些材料的化学加工引起的变化。在这项工作中,固态13 C NMR被用于研究衍生自巴西各种植物物种的大量木质纤维素材料中木质素的含量。为了通过NMR确定木质素含量,由13个中的甲氧基导致的去卷积信号的积分强度使用纤维素和木质素标准品的混合物,使用13 C NMR光谱获得校准曲线。通常,通过NMR获得的木质素含量与通过基于酸水解(AH)的方法获得的结果非常吻合。对于某些样品,NMR结果表明AH方法对于碳水化合物的完全水解无效,表明NMR值代表在这些情况下对木质素含量的更可靠估计。

更新日期:2020-10-02
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