Influence of pH on the Formation of Benzyl Ester Bonds Between Dehydrogenation Polymers and Konjac Glucomannan.

IF 4.2 2区化学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY Molecules Pub Date : 2024-10-31 DOI:10.3390/molecules29215166

Peng Wang, Xu Zhang, Xi Le, Junjun Chen, Guangyan Zhang, Junjian An, Nianjie Feng, Junxian Xie

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Abstract

A thorough understanding of the lignin-carbohydrate complex (LCC) structure has a significant meaning in the high-value utilization of lignocellulose. In this work, the complex (DHPKGC) was obtained by an addition reaction between konjac glucomannan (KGM) and quinone methides generated in the synthesis of dehydrogenation polymers (DHPs) to simulate the formation of LCCs. The effect of pH on the prepared DHPKGC was investigated. The structure of the DHPKGC was characterized by Fourier Transform Infrared (FTIR), ¹³C-Nuclear Magnetic Resonance (¹³C-NMR), and two-dimensional Heteronuclear Single Quantum Coherence Nuclear Magnetic Resonance (2D HSQC NMR) analyses. The results indicated the pH of 4.0 was conducive to the polymerization reaction between DHPs and oxidized KGM by the TEMPO/NaClO/NaBr system. In addition, the resultant DHPKGC was connected by benzyl ester linkages. Overall, this study aims to gain greater insight into the process of LCC formation in plants.

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pH 值对脱氢聚合物与魔芋葡甘聚糖之间形成苄酯键的影响

深入了解木质素-碳水化合物复合物（LCC）的结构对木质纤维素的高值化利用具有重要意义。在这项工作中，通过魔芋葡甘聚糖（KGM）与脱氢聚合物（DHPs）合成过程中产生的醌甲醚进行加成反应，模拟木质素-碳水化合物复合物（LCCs）的形成，得到了复合物（DHPKGC）。研究了 pH 值对制备的 DHPKGC 的影响。通过傅立叶变换红外（FTIR）、13C-核磁共振（13C-NMR）和二维异核单量子相干核磁共振（2D HSQC NMR）分析对 DHPKGC 的结构进行了表征。结果表明，在 TEMPO/NaClO/NaBr 系统中，4.0 的 pH 值有利于 DHP 与氧化 KGM 的聚合反应。此外，生成的 DHPKGC 通过苄酯连接。总之，本研究旨在进一步了解植物中 LCC 的形成过程。

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来源期刊

Molecules 化学-有机化学

CiteScore

7.40

自引率

8.70%

发文量

7524

审稿时长

1.4 months

期刊介绍： Molecules (ISSN 1420-3049, CODEN: MOLEFW) is an open access journal of synthetic organic chemistry and natural product chemistry. All articles are peer-reviewed and published continously upon acceptance. Molecules is published by MDPI, Basel, Switzerland. Our aim is to encourage chemists to publish as much as possible their experimental detail, particularly synthetic procedures and characterization information. There is no restriction on the length of the experimental section. In addition, availability of compound samples is published and considered as important information. Authors are encouraged to register or deposit their chemical samples through the non-profit international organization Molecular Diversity Preservation International (MDPI). Molecules has been launched in 1996 to preserve and exploit molecular diversity of both, chemical information and chemical substances.