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However, their content and quality vary greatly. This review discusses the main factors that influence the yield and quality of polysaccharides, specifically carrageenans and agars (sulfated galactans) found in red algae species (Rhodophyta). In addition, its historical, current, and emerging applications are also discussed. Carrageenan has been influenced mainly by photosynthetically active radiation (PAR) and nitrogen, while its relationship with temperature has not yet been replicated by recent studies. Agar\u2019s seasonal trend has also been found to be more ambiguous than stated before, with light, temperature, nutrients, and pH being influencing factors. In this review, it is also shown that, depending on the compound type, seaweed polysaccharides are influenced by very different key factors, which can be crucial in seaweed aquaculture to promote a high yield and quality of polysaccharides. Additionally, factors like the extraction method and storage of polysaccharides also influence the yield and quality of these compounds. This review also highlights the drawbacks and inadequacy inherent from the conventional (or current) extraction technology approaches.<\/jats:p>","DOI":"10.3390\/md22100432","type":"journal-article","created":{"date-parts":[[2024,9,25]],"date-time":"2024-09-25T16:16:37Z","timestamp":1727280997000},"page":"432","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Red Seaweed (Rhodophyta) Phycocolloids: A Road from the Species to the Industry Application"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2206-2491","authenticated-orcid":false,"given":"Madalena","family":"Mendes","sequence":"first","affiliation":[{"name":"Marine Resources, Conservation and Technology, Marine Algae Lab, CFE\u2014Centre for Functional Ecology\u2014Science for People & Planet, Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5244-221X","authenticated-orcid":false,"given":"Jo\u00e3o","family":"Cotas","sequence":"additional","affiliation":[{"name":"Marine Resources, Conservation and Technology, Marine Algae Lab, CFE\u2014Centre for Functional Ecology\u2014Science for People & Planet, Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5509-1067","authenticated-orcid":false,"given":"Diana","family":"Pacheco","sequence":"additional","affiliation":[{"name":"Marine Resources, Conservation and Technology, Marine Algae Lab, CFE\u2014Centre for Functional Ecology\u2014Science for People & Planet, Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal"}]},{"given":"Kay","family":"Ihle","sequence":"additional","affiliation":[{"name":"Marine Resources, Conservation and Technology, Marine Algae Lab, CFE\u2014Centre for Functional Ecology\u2014Science for People & Planet, Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal"},{"name":"IMBRSea, Ghent University, Krijgslaan 281\/S8, 9000 Ghent, Belgium"}]},{"given":"Alina","family":"Hillinger","sequence":"additional","affiliation":[{"name":"Marine Resources, Conservation and Technology, Marine Algae Lab, CFE\u2014Centre for Functional Ecology\u2014Science for People & Planet, Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal"},{"name":"IMBRSea, Ghent University, Krijgslaan 281\/S8, 9000 Ghent, Belgium"}]},{"given":"Miguel","family":"Cascais","sequence":"additional","affiliation":[{"name":"Marine Resources, Conservation and Technology, Marine Algae Lab, CFE\u2014Centre for Functional Ecology\u2014Science for People & Planet, Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal"},{"name":"Higher Institute for Tourism and Hotel Management of Estoril, Av. Condes de Barcelona, No. 808, 2769-510 Estoril, Portugal"}]},{"given":"Jo\u00e3o Carlos","family":"Marques","sequence":"additional","affiliation":[{"name":"MARE\u2014Marine and Environmental Sciences Centre\/ARNET-Aquatic Research Network, Department of Life Sciences, University of Coimbra, Cal\u00e7ada Martim de Freitas, 3000-456 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6819-0619","authenticated-orcid":false,"given":"Leonel","family":"Pereira","sequence":"additional","affiliation":[{"name":"Marine Resources, Conservation and Technology, Marine Algae Lab, CFE\u2014Centre for Functional Ecology\u2014Science for People & Planet, Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8611-7183","authenticated-orcid":false,"given":"Ana M. 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