title: Impact of cultivation of Mastocarpus stellatus in IMTA on the seaweeds chemistry and hybrid carrageenan properties.
abstract: The biomass yield potential of Mastocarpus stellatus, a commercially attractive carrageenophyte for foods and pharmaceutics, was investigated by cultivating the seaweeds in the nutrient-rich outflow of a commercial fish farm. Results from two consecutive 4 weeks experiments indicate that the cultivation of this seaweed produces a mean biomass of 21 to 40.6 gDW m(-2) day(-1) depending on the time of the experiment. DRIFT and CP-MAS NMR analyses of seaweeds indicate that cultivation during May affected quantitatively the seaweeds chemistry, and thus the chemical and gelling properties of native extracts of kappa/iota-hybrid carrageenan (KI). Overall, algal growth leads to the production of more sulphated KI, the percentage increase varying between 27% and 44% for the two experiments. However, alkali treatment of seaweeds before extraction reduces the variations in gelling properties of KI induced by the algal growth. This study demonstrates the capacity of growing M. stellatus in an integrated multi-trophic aquaculture system for the sustainable production of high value polysaccharides.
authors.affiliation: Institute for Polymers and Composites/I3N, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal.
authors.forename: Gabriela
authors.initials: G
authors.lastname: Azevedo
authors.affiliation: CIIMAR/CIMAR, and Department of Biology, Faculty of Sciences University of Porto, Rua dos Bragas, 289, 4150-123 Porto, Portugal.
authors.forename: Bernardo
authors.initials: B
authors.lastname: Domingues
authors.affiliation: CIIMAR/CIMAR, and Department of Biology, Faculty of Sciences University of Porto, Rua dos Bragas, 289, 4150-123 Porto, Portugal; ALGAplus, Produção e Comercialização de Algas e seus derivados Lda (ALGA+), Rua António Castilho, 3850-405 Angeja, Portugal.
authors.forename: Helena
authors.initials: H
authors.lastname: Abreu
authors.affiliation: CIIMAR/CIMAR, and Department of Biology, Faculty of Sciences University of Porto, Rua dos Bragas, 289, 4150-123 Porto, Portugal.
authors.forename: Isabel
authors.initials: I
authors.lastname: Sousa-Pinto
authors.affiliation: CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
authors.forename: Gabriel
authors.initials: G
authors.lastname: Feio
authors.affiliation: Institute for Polymers and Composites/I3N, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal. Electronic address: loic@dep.uminho.pt.
authors.forename: Loic
authors.initials: L
authors.lastname: Hilliou
mesh_terms: D000818:Animals; D017756:Aquaculture; D066241:Carbon-13 Magnetic Resonance Spectroscopy; D002351:Carrageenan / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D004548:Elasticity; D005399:Fishes; D005782:Gels / Q000737:chemistry; D000461:Rhodophyta / Q000737:chemistry / Q000254:growth & development / Q000378:metabolism; D012624:Seaweed / Q000737:chemistry / Q000254:growth & development / Q000378:metabolism; D014783:Viscosity
chemical_list: D005782:Gels; D002351:Carrageenan
keywords: Hybrid carrageenan; Hydrogel; IMTA; Mastocarpus stellatus; Productivity