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Valorization of Rice Straw via Hydrotropic Lignin Extraction and Its Characterization
Rice straw hydrotropic lignin was extracted from p-Toluene sulfonic acid (p-TsOH) fractionation with a different combined delignification factor (CDF). Hydrotropic lignin characterization was systematically investigated, and alkaline lignin was also studied for the contrast. Results showed that the...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8305794/ https://www.ncbi.nlm.nih.gov/pubmed/34299398 http://dx.doi.org/10.3390/molecules26144123 |
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author | Yin, Chongxin Wang, Min Ma, Qingzhi Bian, Huiyang Ren, Hao Dai, Hongqi Cheng, Jinlan |
author_facet | Yin, Chongxin Wang, Min Ma, Qingzhi Bian, Huiyang Ren, Hao Dai, Hongqi Cheng, Jinlan |
author_sort | Yin, Chongxin |
collection | PubMed |
description | Rice straw hydrotropic lignin was extracted from p-Toluene sulfonic acid (p-TsOH) fractionation with a different combined delignification factor (CDF). Hydrotropic lignin characterization was systematically investigated, and alkaline lignin was also studied for the contrast. Results showed that the hydrotropic rice straw lignin particle was in nanometer scopes. Compared with alkaline lignin, the hydrotropic lignin had greater molecular weight. NMR analysis showed that β-aryl ether linkage was well preserved at low severities, and the unsaturation in the side chain of hydrotropic lignin was high. H units and G units were preferentially degraded and subsequently condensed at high severity. High severity also resulted in the cleavage of part β-aryl ether linkage. (31)P-NMR showed the decrease in aliphatic hydroxyl groups and the increasing carboxyl group content at high severity. The maximum weight loss temperature of the hydrotropic lignin was in the range of 330–350 °C, higher than the alkaline lignin, and the glass conversion temperature (T(g)) of the hydrotropic lignin was in the range of 107–125 °C, lower than that of the alkaline lignin. The hydrotropic lignin has high β-aryl ether linkage content, high activity, nanoscale particle size, and low T(g), which is beneficial for its further valorization. |
format | Online Article Text |
id | pubmed-8305794 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-83057942021-07-25 Valorization of Rice Straw via Hydrotropic Lignin Extraction and Its Characterization Yin, Chongxin Wang, Min Ma, Qingzhi Bian, Huiyang Ren, Hao Dai, Hongqi Cheng, Jinlan Molecules Article Rice straw hydrotropic lignin was extracted from p-Toluene sulfonic acid (p-TsOH) fractionation with a different combined delignification factor (CDF). Hydrotropic lignin characterization was systematically investigated, and alkaline lignin was also studied for the contrast. Results showed that the hydrotropic rice straw lignin particle was in nanometer scopes. Compared with alkaline lignin, the hydrotropic lignin had greater molecular weight. NMR analysis showed that β-aryl ether linkage was well preserved at low severities, and the unsaturation in the side chain of hydrotropic lignin was high. H units and G units were preferentially degraded and subsequently condensed at high severity. High severity also resulted in the cleavage of part β-aryl ether linkage. (31)P-NMR showed the decrease in aliphatic hydroxyl groups and the increasing carboxyl group content at high severity. The maximum weight loss temperature of the hydrotropic lignin was in the range of 330–350 °C, higher than the alkaline lignin, and the glass conversion temperature (T(g)) of the hydrotropic lignin was in the range of 107–125 °C, lower than that of the alkaline lignin. The hydrotropic lignin has high β-aryl ether linkage content, high activity, nanoscale particle size, and low T(g), which is beneficial for its further valorization. MDPI 2021-07-06 /pmc/articles/PMC8305794/ /pubmed/34299398 http://dx.doi.org/10.3390/molecules26144123 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Yin, Chongxin Wang, Min Ma, Qingzhi Bian, Huiyang Ren, Hao Dai, Hongqi Cheng, Jinlan Valorization of Rice Straw via Hydrotropic Lignin Extraction and Its Characterization |
title | Valorization of Rice Straw via Hydrotropic Lignin Extraction and Its Characterization |
title_full | Valorization of Rice Straw via Hydrotropic Lignin Extraction and Its Characterization |
title_fullStr | Valorization of Rice Straw via Hydrotropic Lignin Extraction and Its Characterization |
title_full_unstemmed | Valorization of Rice Straw via Hydrotropic Lignin Extraction and Its Characterization |
title_short | Valorization of Rice Straw via Hydrotropic Lignin Extraction and Its Characterization |
title_sort | valorization of rice straw via hydrotropic lignin extraction and its characterization |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8305794/ https://www.ncbi.nlm.nih.gov/pubmed/34299398 http://dx.doi.org/10.3390/molecules26144123 |
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