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The lignin from <jats:italic>E.\u2005globulus<\/jats:italic> bark is found to be enriched in syringyl (S) units, with lower amounts of guaiacyl (G) and <jats:italic>p<\/jats:italic>\u2010hydroxyphenyl (H) units (H\/G\/S ratio of 1:26:73), which produces a lignin that is highly enriched in \u03b2\u2010ether linkages (83\u2009%), whereas those from the two <jats:italic>Acacia<\/jats:italic> barks have similar compositions (H\/G\/S ratio of \u22485:50:45), with a predominance of \u03b2\u2010ethers (73\u201375\u2009%) and lower amounts of condensed carbon\u2013carbon linkages; the lignin from <jats:italic>A.\u2005dealbata<\/jats:italic> bark also includes some resorcinol\u2010related compounds, that appear to be incorporated or intimately associated to the polymer. The lignin from <jats:italic>P.\u2005abies<\/jats:italic> bark is enriched in G units, with lower amounts of H units (H\/G ratio of 14:86); this lignin is thus depleted in \u03b2\u2010O\u20104\u2032 alkyl\u2013aryl ether linkages (44\u2009%) and enriched in condensed linkages. Interestingly, this lignin contains large amounts of hydroxystilbene glucosides that seem to be integrally incorporated into the lignin structure. This study indicates that lignins from tree barks can be seen as an interesting source of valuable phenolic compounds. Moreover, this study is useful for tailoring conversion technologies for bark deconstruction and valorization.<\/jats:p>","DOI":"10.1002\/cssc.202000431","type":"journal-article","created":{"date-parts":[[2020,5,12]],"date-time":"2020-05-12T05:49:38Z","timestamp":1589262578000},"page":"4537-4547","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":70,"title":["Lignin from Tree Barks: Chemical Structure and Valorization"],"prefix":"10.1002","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5913-5976","authenticated-orcid":false,"given":"Duarte M.","family":"Neiva","sequence":"first","affiliation":[{"name":"Department of Plant Biotechnology Instituto de Recursos Naturales y Agrobiolog\u00eda de Sevilla (IRNAS) CSIC  Av. Reina Mercedes, 10 41012- Seville Spain"},{"name":"Centro de Estudos Florestais Instituto Superior de Agronomia Universidade de Lisboa  Tapada da Ajuda 1349-017 Lisboa Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2728-7331","authenticated-orcid":false,"given":"Jorge","family":"Rencoret","sequence":"additional","affiliation":[{"name":"Department of Plant Biotechnology Instituto de Recursos Naturales y Agrobiolog\u00eda de Sevilla (IRNAS) CSIC  Av. Reina Mercedes, 10 41012- Seville Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6431-8267","authenticated-orcid":false,"given":"Gisela","family":"Marques","sequence":"additional","affiliation":[{"name":"Department of Plant Biotechnology Instituto de Recursos Naturales y Agrobiolog\u00eda de Sevilla (IRNAS) CSIC  Av. Reina Mercedes, 10 41012- Seville Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8823-9029","authenticated-orcid":false,"given":"Ana","family":"Guti\u00e9rrez","sequence":"additional","affiliation":[{"name":"Department of Plant Biotechnology Instituto de Recursos Naturales y Agrobiolog\u00eda de Sevilla (IRNAS) CSIC  Av. Reina Mercedes, 10 41012- Seville Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3419-6075","authenticated-orcid":false,"given":"Jorge","family":"Gominho","sequence":"additional","affiliation":[{"name":"Centro de Estudos Florestais Instituto Superior de Agronomia Universidade de Lisboa  Tapada da Ajuda 1349-017 Lisboa Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5393-4443","authenticated-orcid":false,"given":"Helena","family":"Pereira","sequence":"additional","affiliation":[{"name":"Centro de Estudos Florestais Instituto Superior de Agronomia Universidade de Lisboa  Tapada da Ajuda 1349-017 Lisboa Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3040-6787","authenticated-orcid":false,"given":"Jos\u00e9 C.","family":"del R\u00edo","sequence":"additional","affiliation":[{"name":"Department of Plant Biotechnology Instituto de Recursos Naturales y Agrobiolog\u00eda de Sevilla (IRNAS) CSIC  Av. 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