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Article

Structural Changes in Milled Wood Lignin (MWL) of Chinese Quince (Chaenomeles sinensis) Fruit Subjected to Subcritical Water Treatment

1
School of Life Sciences, Zhengzhou University, Zhengzhou 450001, China
2
College of Food Science and Technology, Henan University of Technology, Zhengzhou 450001, China
*
Authors to whom correspondence should be addressed.
Molecules 2021, 26(2), 398; https://doi.org/10.3390/molecules26020398
Received: 10 November 2020 / Revised: 8 January 2021 / Accepted: 8 January 2021 / Published: 13 January 2021
Subcritical water treatment has received considerable attention due to its cost effectiveness and environmentally friendly properties. In this investigation, Chinese quince fruits were submitted to subcritical water treatment (130, 150, and 170 °C), and the influence of treatments on the structure of milled wood lignin (MWL) was evaluated. Structural properties of these lignin samples (UL, L130, L150, and L170) were investigated by high-performance anion exchange chromatography (HPAEC), FT-IR, gel permeation chromatography (GPC), TGA, pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS), 2D-Heteronculear Single Quantum Coherence (HSQC) -NMR, and 31P-NMR. The carbohydrate analysis showed that xylose in the samples increased significantly with higher temperature, and according to molecular weight and thermal analysis, the MWLs of the pretreated residues have higher thermal stability with increased molecular weight. The spectra of 2D-NMR and 31P-NMR demonstrated that the chemical linkages in the MWLs were mainly β-O-4′ ether bonds, β-5′ and β-β′, and the units were principally G- S- H- type with small amounts of ferulic acids; these results are consistent with the results of Py-GC/MS analysis. It is believed that understanding the structural changes in MWL caused by subcritical water treatment will contribute to understanding the mechanism of subcritical water extraction, which in turn will provide a theoretical basis for developing the technology of subcritical water extraction. View Full-Text
Keywords: Chinese quince; subcritical water; MWL; structure Chinese quince; subcritical water; MWL; structure
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MDPI and ACS Style

Wang, W.-Y.; Qin, Z.; Liu, H.-M.; Wang, X.-D.; Gao, J.-H.; Qin, G.-Y. Structural Changes in Milled Wood Lignin (MWL) of Chinese Quince (Chaenomeles sinensis) Fruit Subjected to Subcritical Water Treatment. Molecules 2021, 26, 398. https://doi.org/10.3390/molecules26020398

AMA Style

Wang W-Y, Qin Z, Liu H-M, Wang X-D, Gao J-H, Qin G-Y. Structural Changes in Milled Wood Lignin (MWL) of Chinese Quince (Chaenomeles sinensis) Fruit Subjected to Subcritical Water Treatment. Molecules. 2021; 26(2):398. https://doi.org/10.3390/molecules26020398

Chicago/Turabian Style

Wang, Wen-Yue, Zhao Qin, Hua-Min Liu, Xue-De Wang, Jing-Hao Gao, and Guang-Yong Qin. 2021. "Structural Changes in Milled Wood Lignin (MWL) of Chinese Quince (Chaenomeles sinensis) Fruit Subjected to Subcritical Water Treatment" Molecules 26, no. 2: 398. https://doi.org/10.3390/molecules26020398

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