{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,6]],"date-time":"2026-04-06T13:56:09Z","timestamp":1775483769012,"version":"3.50.1"},"reference-count":88,"publisher":"Walter de Gruyter GmbH","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2020,2,25]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The accessibility of glucuronoxylan from a refined, bleached <jats:italic>Eucalyptus globulus<\/jats:italic> industrial kraft pulp in 0\u201318% aqueous NaOH solution at room temperature (25\u00b0C) was studied. The extraction profile revealed a maximum extraction of xylan in the pulp at about 10\u201312% NaOH concentration and was explained by the maximum swelling of the pulp according to the Gibbs-Donnan equilibrium. The kinetics of xylan removal and the monitoring of its structural features were performed at 5 and 10% NaOH concentrations. The maximum yields of xylans with 10% and 5% NaOH were as high as 90% and 60% for 2 h extraction, respectively. The structural features of xylan were assessed by acid methanolysis and one-dimensional (1D)\/two-dimensional (2D) nuclear magnetic resonance (NMR), and the molecular weight by size exclusion chromatography (SEC). The xylan extracted with 10% NaOH had a slightly higher molecular weight and a lower branching with uronic moieties than the xylan extracted with 5% NaOH. The former was less pure (contained more \u03b2-cellulose) than the latter. Structural studies by NMR resulted in the conclusion that there are at least two types of xylans removed from the pulp: one xylan with relatively high 4-<jats:italic>O<\/jats:italic>-methyl-\u03b1-D-glucuronosyl [MeGlcA-(1\u2192] and [\u21922)-MeGlcA-(1\u2192] substituents and another xylan with a much lower substitution with uronic residues.<\/jats:p>","DOI":"10.1515\/hf-2019-0023","type":"journal-article","created":{"date-parts":[[2019,6,21]],"date-time":"2019-06-21T09:02:56Z","timestamp":1561107776000},"page":"141-148","source":"Crossref","is-referenced-by-count":18,"title":["Xylan accessibility of bleached eucalypt pulp in alkaline solutions"],"prefix":"10.1515","volume":"74","author":[{"given":"Teresa M.P.","family":"Gomes","sequence":"first","affiliation":[{"name":"CICECO\/Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"given":"Ant\u00f3nio P.","family":"Mendes de Sousa","sequence":"additional","affiliation":[{"name":"Research Institute on Forestry and Paper (RAIZ), Quinta de S. Francisco, Eixo 3801-501, Portugal"}]},{"given":"Yuri I.","family":"Belenkiy","sequence":"additional","affiliation":[{"name":"St. Petersburg Forest Technical University, Institutsky per. 5, 194021 St. Petersburg, Russian Federation"}]},{"given":"Dmitry V.","family":"Evtuguin","sequence":"additional","affiliation":[{"name":"CICECO\/Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal"}]}],"member":"374","reference":[{"key":"ref151","first-page":"49","article-title":"Sorption of hemicelluloses on cellulose fibres. Part 3. 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