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This highlights the importance of developing sustainable and renewable production sources. Conventional extraction methods, although effective, are often energy-intensive and rely on harsh chemicals. In this context, brown algae are a promising alternative due to their abundance and renewability. This study investigated the potential of Saccorhiza polyschides and Sargassum muticum as sources of sodium alginate (SA), thus optimising an extraction process that combines acid treatment with an alkaline step. The extracted biopolymers were characterised using FTIR, H-NMR, STA, SEM\/EDX, viscosity measurements, dynamic light scattering, and spectrophotometric assays of residual polyphenols and proteins. The optimised extraction conditions produced yields above 20% of high-purity alginate. When compared with commercial SA, the extracted materials showed comparable quality while relying on a simplified, solvent-reduced protocol that improves process efficiency and reduces the environmental impact. These results demonstrate that S. polyschides and S. muticum are promising, locally available sources of high-quality sodium alginate, and that industrially relevant yields (&gt;20%) can be achieved through an environmentally conscious two-step extraction process.<\/jats:p>","DOI":"10.3390\/md24020060","type":"journal-article","created":{"date-parts":[[2026,2,2]],"date-time":"2026-02-02T16:12:37Z","timestamp":1770048757000},"page":"60","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Optimisation of Alginate Extraction and Characterisation of Polysaccharides from Brown Seaweed from the Portuguese Coast"],"prefix":"10.3390","volume":"24","author":[{"given":"Joana Corr\u00eaa","family":"Mendes","sequence":"first","affiliation":[{"name":"ESTM\u2014School of Tourism and Maritime Technology, Polytechnic of Leiria, Rua do Conhecimento 4, 2520-614 Peniche, Portugal"},{"name":"CDRSP-PL\u2014Centre for Rapid and Sustainable Product Development, Polytechnic of Leiria, 2411-901 Leiria, Portugal"},{"name":"RISE-Health, UBI\u2014Department of Medical Sciences, Faculty of Health Sciences, University of Beira Interior, Av. Infante D. Henrique, 6200-506 Covilh\u00e3, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2408-9762","authenticated-orcid":false,"given":"Joana F. A.","family":"Valente","sequence":"additional","affiliation":[{"name":"CDRSP-PL\u2014Centre for Rapid and Sustainable Product Development, Polytechnic of Leiria, 2411-901 Leiria, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9996-2194","authenticated-orcid":false,"given":"Fani","family":"Sousa","sequence":"additional","affiliation":[{"name":"RISE-Health, UBI\u2014Department of Medical Sciences, Faculty of Health Sciences, University of Beira Interior, Av. Infante D. Henrique, 6200-506 Covilh\u00e3, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7775-0614","authenticated-orcid":false,"given":"Raul","family":"Bernardino","sequence":"additional","affiliation":[{"name":"ESTM\u2014School of Tourism and Maritime Technology, Polytechnic of Leiria, Rua do Conhecimento 4, 2520-614 Peniche, Portugal"},{"name":"MARE\u2014Marine and Environmental Sciences Centre\/ARNET\u2013Aquatic Research Network, School of Tourism and Maritime Technology, Polytechnic of Leiria, Edif\u00edcio Cetemares, Av. Porto de Pesca, 2520-641 Peniche, Portugal"},{"name":"LSRE-LCM\u2014Laboratory of Separation and Reaction Engineering-Laboratory of Catalysis and Materials, School of Tourism and Maritime Technology, Polytechnic Institute of Leiria, 2520-614 Peniche, Portugal"},{"name":"ALiCE\u2014Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal"}]},{"given":"Susana","family":"Bernardino","sequence":"additional","affiliation":[{"name":"ESTM\u2014School of Tourism and Maritime Technology, Polytechnic of Leiria, Rua do Conhecimento 4, 2520-614 Peniche, Portugal"},{"name":"MARE\u2014Marine and Environmental Sciences Centre\/ARNET\u2013Aquatic Research Network, School of Tourism and Maritime Technology, Polytechnic of Leiria, Edif\u00edcio Cetemares, Av. Porto de Pesca, 2520-641 Peniche, Portugal"},{"name":"LSRE-LCM\u2014Laboratory of Separation and Reaction Engineering-Laboratory of Catalysis and Materials, School of Tourism and Maritime Technology, Polytechnic Institute of Leiria, 2520-614 Peniche, Portugal"},{"name":"ALiCE\u2014Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4167-5237","authenticated-orcid":false,"given":"Cl\u00e9lia","family":"Afonso","sequence":"additional","affiliation":[{"name":"ESTM\u2014School of Tourism and Maritime Technology, Polytechnic of Leiria, Rua do Conhecimento 4, 2520-614 Peniche, Portugal"},{"name":"MARE\u2014Marine and Environmental Sciences Centre\/ARNET\u2013Aquatic Research Network, School of Tourism and Maritime Technology, Polytechnic of Leiria, Edif\u00edcio Cetemares, Av. Porto de Pesca, 2520-641 Peniche, Portugal"}]},{"given":"B\u00e1rbara","family":"Chagas","sequence":"additional","affiliation":[{"name":"ESTM\u2014School of Tourism and Maritime Technology, Polytechnic of Leiria, Rua do Conhecimento 4, 2520-614 Peniche, Portugal"},{"name":"MARE\u2014Marine and Environmental Sciences Centre\/ARNET\u2013Aquatic Research Network, School of Tourism and Maritime Technology, Polytechnic of Leiria, Edif\u00edcio Cetemares, Av. Porto de Pesca, 2520-641 Peniche, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2026,2,1]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Puscaselu, R.G., Lobiuc, A., Dimian, M., and Covasa, M. (2020). Alginate: From food industry to biomedical applications and management of metabolic disorders. 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