2013年3月1日 · Lignin is the second-most abundant polymer after cellulose within the biomass of our planet. Structurally, it displays random oligomeric units without fixed repetition schemes beyond the stage of dimers. Quantitative 1 H- 13C HSQC measurements have recently greatly facilitated lignin analyses.

2024年5月13日 · Here, we developed a rapid elevated-temperature 1 H− 13 C Heteronuclear Single-Quantum Coherence Zero (HSQC 0) NMR method that enables this precise quantification of native lignin structural characteristics even with whole plant cell wall (WPCW) NMR spectroscopy, overcoming fast spin relaxation in the gel phase.

2023年6月30日 · The variations of structure features and chemical linkages of lignin and LCC were investigated via FT-IR, 2D HSQC NMR, and 31 P NMR techniques. 2D HSQC NMR revealed that β-O-4 alkyl-aryl ether linkages and resinol (β-β) substructure were the main substructures in BF-MWLp and PC-MWLp.

2011年9月1日 · Quantification of their structural features has been achieved by using a combination of quantitative 13 C and 2D HSQC NMR techniques. The results showed that acetylated 4- O -methylgluconoxylan is the main carbohydrate associated with lignins, and acetyl groups frequently acylate the C2 and C3 positions.

2025年1月1日 · This study applies NUS/2D HSQC NMR to qualitatively and quantitatively characterize lignin. By comparing NUS/2D HSQC spectra at various sampling ratios with traditional 2D HSQC, evaluating the signal assignment, spectral resolution, and quantification relative errors in structural units and linkages, ultimately determining the optimal sampling ...

2003年3月14日 · We developed the Q-HSQC approach for the quantitative analysis of wood lignin, a complex polymer where it has been difficult to obtain reliable data on the relative amounts of different structural units. The current method is applicable to a variety of complex mixtures, where normal 1D 1 H- and 13 C-NMR methods fail.

2024年5月13日 · Here, we developed a rapid elevated-temperature 1H–13C Heteronuclear Single-Quantum Coherence Zero (HSQC0) NMR method that enables this precise quantification of native lignin structural characteristics even with whole plant cell wall (WPCW) NMR spectroscopy, overcoming fast spin relaxation in the gel phase.

Abstract: Lignin is the second-most abundant polymer after cellulose within the biomass of our planet. Structurally, it displays random oligomeric units without fixed repetition schemes beyond the stage of dimers. Quantitative H- 3C HSQC measurements have …

Quantification of their structural features has been achieved by using a combination of quantitative 13C and 2D HSQC NMR techniques. The results showed that acetylated 4-O-methylgluconoxylan is...

2011年2月5日 · A quantitative approach to characterize lignin–carbohydrate complex (LCC) linkages using a combination of quantitative 13C NMR and HSQC 2D NMR techni