Extraction and Characterization of Hemicelluloses from a Softwood Acid Sulfite Pulp

Autor:	Frédérique Ham-Pichavant, Pauline Vincent, Henri Cramail, Sergio Mastroianni, Gérard Mignani, Stéphane Grelier, Christelle Michaud
Přispěvatelé:	Team 2 LCPO : Biopolymers & Bio-sourced Polymers, Laboratoire de Chimie des Polymères Organiques (LCPO), Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC), Rayonier Inc., Partenaires INRAE, Solvay (France)
Rok vydání:	2021
Předmět:	0106 biological sciences Thermogravimetric analysis Softwood Polymers and Plastics methylglucuronoxylans Organic chemistry 02 engineering and technology engineering.material 01 natural sciences Article hemicelluloses extraction sulfite pulp chemistry.chemical_compound QD241-441 Sulfite 010608 biotechnology Lignin Molar mass Chemistry Pulp (paper) Extraction (chemistry) General Chemistry Nuclear magnetic resonance spectroscopy 021001 nanoscience & nanotechnology [CHIM.POLY]Chemical Sciences/Polymers softwood engineering 0210 nano-technology glucomannans Nuclear chemistry
Zdroj:	Polymers Polymers, MDPI, 2021, 13 (13), pp.2044. ⟨10.3390/polym13132044⟩ Volume 13 Issue 13 Polymers, Vol 13, Iss 2044, p 2044 (2021)
ISSN:	2073-4360
DOI:	10.3390/polym13132044
Popis:	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 1H, 13C 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, Mw varying between 18,900 and 30,000 g/mol after acid sulfite pulping.
Databáze:	OpenAIRE
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