Extraction and Characterization of Hemicelluloses from a Softwood Acid Sulfite Pulp
Hemicelluloses were extracted from a softwood acid sulfite pulp in a three-step procedure. Further delignification step resulted in a holocellulose pulp containing only 1.7 wt.% of the lignin left. Cold caustic extraction (CCE) with 18 wt.% NaOH at 60 °C for 1 h was performed to solubilize hemicellu...
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doaj-76f7b66a626d4de18f80fb269f174e942021-07-15T15:43:18ZengMDPI AGPolymers2073-43602021-06-01132044204410.3390/polym13132044Extraction and Characterization of Hemicelluloses from a Softwood Acid Sulfite PulpPauline Vincent0Frédérique Ham-Pichavant1Christelle Michaud2Gérard Mignani3Sergio Mastroianni4Henri Cramail5Stéphane Grelier6CNRS, University Bordeaux, Bordeaux INP, LCPO, UMR 5629, 33600 Pessac, FranceCNRS, University Bordeaux, Bordeaux INP, LCPO, UMR 5629, 33600 Pessac, FranceRayonier AM France Innovation, 33174 Gradignan, FranceResearch and Innovation Center of Lyon, Solvay, 85 Avenue des Frères Perret, 69192 Saint Fons, FranceResearch and Innovation Center of Lyon, Solvay, 85 Avenue des Frères Perret, 69192 Saint Fons, FranceCNRS, University Bordeaux, Bordeaux INP, LCPO, UMR 5629, 33600 Pessac, FranceCNRS, University Bordeaux, Bordeaux INP, LCPO, UMR 5629, 33600 Pessac, FranceHemicelluloses were extracted from a softwood acid sulfite pulp in a three-step procedure. Further delignification step resulted in a holocellulose pulp containing only 1.7 wt.% of the lignin left. Cold caustic extraction (CCE) with 18 wt.% NaOH at 60 °C for 1 h was performed to solubilize hemicelluloses of the holocellulose. An unbleached cellulose pulp was then obtained 97% pure, which indicates that 89% of the hemicelluloses were removed. After purification, extraction yields between 1.1 wt.% and 9.5 wt.% were obtained from the delignified pulp and the hemicelluloses’ chemical compositions and structures were investigated by <sup>1</sup>H, <sup>13</sup>C nuclear magnetic resonance spectroscopy (NMR) and two-dimensional NMR by correlation spectroscopy (2D-COSY) and proton-detected heteronuclear single-quantum correlation (2D-HSQC), high-performance anion-exchange chromatography coupled with a pulsed amperometry detector (HPAEC-PAD), size-exclusion chromatography coupled with a refractive index detector (SEC-RI) and thermogravimetric analyses (TGA). Hemicelluloses were obtained with a purity of 96%, with short cellulosic chains as the only residue. Sulfite pulping modified the hemicelluloses’ structure, and it was found that two types of hemicelluloses were isolated, glucomannans, predominant at 67%, and methylglucuronoxylans. Finally, alkali-soluble hemicelluloses displayed relatively narrow size distributions and low molar masses, M<sub>w</sub> varying between 18,900 and 30,000 g/mol after acid sulfite pulping.https://www.mdpi.com/2073-4360/13/13/2044softwoodsulfite pulphemicelluloses extractionglucomannansmethylglucuronoxylans |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Pauline Vincent Frédérique Ham-Pichavant Christelle Michaud Gérard Mignani Sergio Mastroianni Henri Cramail Stéphane Grelier |
spellingShingle |
Pauline Vincent Frédérique Ham-Pichavant Christelle Michaud Gérard Mignani Sergio Mastroianni Henri Cramail Stéphane Grelier Extraction and Characterization of Hemicelluloses from a Softwood Acid Sulfite Pulp Polymers softwood sulfite pulp hemicelluloses extraction glucomannans methylglucuronoxylans |
author_facet |
Pauline Vincent Frédérique Ham-Pichavant Christelle Michaud Gérard Mignani Sergio Mastroianni Henri Cramail Stéphane Grelier |
author_sort |
Pauline Vincent |
title |
Extraction and Characterization of Hemicelluloses from a Softwood Acid Sulfite Pulp |
title_short |
Extraction and Characterization of Hemicelluloses from a Softwood Acid Sulfite Pulp |
title_full |
Extraction and Characterization of Hemicelluloses from a Softwood Acid Sulfite Pulp |
title_fullStr |
Extraction and Characterization of Hemicelluloses from a Softwood Acid Sulfite Pulp |
title_full_unstemmed |
Extraction and Characterization of Hemicelluloses from a Softwood Acid Sulfite Pulp |
title_sort |
extraction and characterization of hemicelluloses from a softwood acid sulfite pulp |
publisher |
MDPI AG |
series |
Polymers |
issn |
2073-4360 |
publishDate |
2021-06-01 |
description |
Hemicelluloses were extracted from a softwood acid sulfite pulp in a three-step procedure. Further delignification step resulted in a holocellulose pulp containing only 1.7 wt.% of the lignin left. Cold caustic extraction (CCE) with 18 wt.% NaOH at 60 °C for 1 h was performed to solubilize hemicelluloses of the holocellulose. An unbleached cellulose pulp was then obtained 97% pure, which indicates that 89% of the hemicelluloses were removed. After purification, extraction yields between 1.1 wt.% and 9.5 wt.% were obtained from the delignified pulp and the hemicelluloses’ chemical compositions and structures were investigated by <sup>1</sup>H, <sup>13</sup>C nuclear magnetic resonance spectroscopy (NMR) and two-dimensional NMR by correlation spectroscopy (2D-COSY) and proton-detected heteronuclear single-quantum correlation (2D-HSQC), high-performance anion-exchange chromatography coupled with a pulsed amperometry detector (HPAEC-PAD), size-exclusion chromatography coupled with a refractive index detector (SEC-RI) and thermogravimetric analyses (TGA). Hemicelluloses were obtained with a purity of 96%, with short cellulosic chains as the only residue. Sulfite pulping modified the hemicelluloses’ structure, and it was found that two types of hemicelluloses were isolated, glucomannans, predominant at 67%, and methylglucuronoxylans. Finally, alkali-soluble hemicelluloses displayed relatively narrow size distributions and low molar masses, M<sub>w</sub> varying between 18,900 and 30,000 g/mol after acid sulfite pulping. |
topic |
softwood sulfite pulp hemicelluloses extraction glucomannans methylglucuronoxylans |
url |
https://www.mdpi.com/2073-4360/13/13/2044 |
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