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Cotas J, Pacheco D, Araujo GS, Valado A, Critchley AT, Pereira L. On the Health Benefits vs. Risks of Seaweeds and Their Constituents: The Curious Case of the Polymer Paradigm. Mar Drugs 2021; 19:164. [PMID: 33808736 PMCID: PMC8003528 DOI: 10.3390/md19030164] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 03/12/2021] [Accepted: 03/16/2021] [Indexed: 12/11/2022] Open
Abstract
To exploit the nutraceutical and biomedical potential of selected seaweed-derived polymers in an economically viable way, it is necessary to analyze and understand their quality and yield fluctuations throughout the seasons. In this study, the seasonal polysaccharide yield and respective quality were evaluated in three selected seaweeds, namely the agarophyte Gracilaria gracilis, the carrageenophyte Calliblepharis jubata (both red seaweeds) and the alginophyte Sargassum muticum (brown seaweed). It was found that the agar synthesis of G. gracilis did not significantly differ with the seasons (27.04% seaweed dry weight (DW)). In contrast, the carrageenan content in C. jubata varied seasonally, being synthesized in higher concentrations during the summer (18.73% DW). Meanwhile, the alginate synthesis of S. muticum exhibited a higher concentration (36.88% DW) during the winter. Therefore, there is a need to assess the threshold at which seaweed-derived polymers may have positive effects or negative impacts on human nutrition. Furthermore, this study highlights the three polymers, along with their known thresholds, at which they can have positive and/or negative health impacts. Such knowledge is key to recognizing the paradigm governing their successful deployment and related beneficial applications in humans.
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Affiliation(s)
- João Cotas
- Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal; (J.C.); (D.P.); (L.P.)
- Marine and Environmental Sciences Centre (MARE), Faculty of Sciences and Technology, University of Coimbra, 3001-456 Coimbra, Portugal;
| | - Diana Pacheco
- Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal; (J.C.); (D.P.); (L.P.)
- Marine and Environmental Sciences Centre (MARE), Faculty of Sciences and Technology, University of Coimbra, 3001-456 Coimbra, Portugal;
| | - Glacio Souza Araujo
- Federal Institute of Education, Science and Technology of Ceará—IFCE, Campus Aracati, CE 040, km 137,1, Aracati 62800-000, Ceara, Brazil;
| | - Ana Valado
- Marine and Environmental Sciences Centre (MARE), Faculty of Sciences and Technology, University of Coimbra, 3001-456 Coimbra, Portugal;
- Department of Biomedical Laboratory Sciences, Polytechnic Institute of Coimbra, ESTeSC-Coimbra Health School, Rua 5 de Outubro, S. Martinho do Bispo, Apartamento 7006, 3046-854 Coimbra, Portugal
| | - Alan T. Critchley
- Verschuren Centre for Sustainability in Energy and the Environment, Sydney, NS B1P 6L2, Canada
| | - Leonel Pereira
- Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal; (J.C.); (D.P.); (L.P.)
- Marine and Environmental Sciences Centre (MARE), Faculty of Sciences and Technology, University of Coimbra, 3001-456 Coimbra, Portugal;
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Aden M, Husson J, Monney S, Franchi M, Knorr M, Euvrard M. Biosorption of Pb(II) ions from aqueous solution using alginates extracted from Djiboutian seaweeds and deposited on silica particles. PURE APPL CHEM 2019. [DOI: 10.1515/pac-2018-1003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
High-molecular alginates were extracted from Djiboutian brown seaweeds, Sargassum sp. (S) and Turbinaria (T) and isolated as sodium salts in 31.0 and 42.7% yield by weight. 1H NMR analysis of the uronic acid block-structure indicates mannuronic/guluronic M/G ratios of 0.49 and 3.0 for the alginates extracts, respectively. The resulting alginates were deposited onto native Aerosil 200 silica, amine-functionalized and carboxyl-functionalized silica particles to enhance the mechanical strength providing Alg.(T/S)+SiO2) Alg.(T/S)+SiO2NH2) and Alg.(T)+SiO2CO2H) composites. Taking Pb(II) as examples for toxic heavy metal ions, the effects of the pH, adsorption kinetics, and isotherms have been studied systematically. The best uptake achieved was 585 mg Pb2+ ion/g using Alg.S+SiO2NH2. Furthermore, the Pb(II) ions were successfully desorbed in several cycles from Alg.T+SiO2 using 0.5 M hydrochloric acid. Therefore, Alg.T+SiO2 may be considered as a low-cost biosorbent that quickly adsorbs and easily desorbs analyte lead ions. A comparison of the adsorption capacity of our biopolymer-coated particles with that of other adsorbents reported in the literature reveals that our materials are among the best performing for the adsorption of Pb(II).
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Affiliation(s)
- Moumin Aden
- Institut UTINAM, UMR CNRS 6213, Université Bourgogne Franche-Comté , 16 Route de Gray , Besançon 25030 , France
- Faculté des Sciences, Université de Djibouti , Avenue Djanaleh 1904 , Djibouti
| | - Jérôme Husson
- Institut UTINAM, UMR CNRS 6213, Université Bourgogne Franche-Comté , 16 Route de Gray , Besançon 25030 , France
| | - Sandrine Monney
- Institut UTINAM, UMR CNRS 6213, Université Bourgogne Franche-Comté , 16 Route de Gray , Besançon 25030 , France
| | - Marielle Franchi
- IUT de Chimie, Université Bourgogne Franche-Comté , 30 Avenue de l’Observatoire , Besançon 25090 , France
| | - Michael Knorr
- Institut UTINAM, UMR CNRS 6213, Université Bourgogne Franche-Comté , 16 Route de Gray , Besançon 25030 , France
| | - Myriam Euvrard
- Institut UTINAM, UMR CNRS 6213, Université Bourgogne Franche-Comté , 16 Route de Gray , Besançon 25030 , France
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Monteiro CA, Serrão EA, Pearson GA. Reproductive investment, synchrony and recruitment success in marine broadcast spawners: Effects of mating system and habitat (exposed shore versus estuary). MARINE ENVIRONMENTAL RESEARCH 2015; 112:33-9. [PMID: 26183537 DOI: 10.1016/j.marenvres.2015.07.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Revised: 06/10/2015] [Accepted: 07/01/2015] [Indexed: 06/04/2023]
Abstract
The timing and synchrony of gamete release in broadcast spawners have important implications for fertilization success, recruitment and to explain differences in reproductive success under distinct reproductive modes in sympatry. Our objective was to compare the reproductive timing and investment for sister species with contrasting mating systems; Fucus guiryi (selfing hermaphroditic) and Fucus vesiculosus (dioecious) in habitats with different wave exposures (exposed shore and estuary). Over two months, daily gamete release, recruitment and population structure were recorded. Our results show spawning synchrony between species and habitats, but release events in hermaphrodites occupied broader temporal windows in estuarine than exposed shore habitats. On the exposed shore both species increased the synchrony of release and amount of eggs. In the estuary, hermaphrodites relied on broader temporal spawning windows and a larger canopy, and the dioecious species had higher recruitment success, important factors determining persistence.
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Affiliation(s)
- Carla A Monteiro
- CCMAR, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
| | - Ester A Serrão
- CCMAR, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal.
| | - Gareth A Pearson
- CCMAR, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
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Vaz-Pinto F, Olabarria C, Gestoso I, Cacabelos E, Incera M, Arenas F. Functional diversity and climate change: effects on the invasibility of macroalgal assemblages. Biol Invasions 2013. [DOI: 10.1007/s10530-013-0412-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Le Lann K, Connan S, Stiger-Pouvreau V. Phenology, TPC and size-fractioning phenolics variability in temperate Sargassaceae (Phaeophyceae, Fucales) from Western Brittany: native versus introduced species. MARINE ENVIRONMENTAL RESEARCH 2012; 80:1-11. [PMID: 22770761 DOI: 10.1016/j.marenvres.2012.05.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Revised: 05/29/2012] [Accepted: 05/30/2012] [Indexed: 06/01/2023]
Abstract
The phenology of the introduced Sargassum muticum and two native species Bifurcaria bifurcata and Cystoseira baccata were monitored during eighteen months at two sites in Brittany. Density and length varied seasonally only in Sargassum. Larger individuals of Sargassum were observed in summer whereas in Cystoseira, they appeared almost in autumn. Peaks in maturity were delayed: in summer for Sargassum and in winter for Cystoseira and Bifurcaria. Phenolic contents increased before their respective reproductive period as a chemical defence. Moreover, size composition varied with site and season depending on species. In Sargassum, the quantity of small compounds decreased in summer together with an increase of 2000/5000 Da compounds. In Bifurcaria 2000/5000 Da compounds increased in summer (photoprotection) while in Cystoseira it increased in winter (protection for reproduction). Sargassum presented then a phenological plasticity not observed in native species. Moreover the three species possessed different chemical strategies to succeed in partitioning their vital space.
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Affiliation(s)
- K Le Lann
- LEBHAM EA 3877, European Institute of Marine Studies (IUEM), University of Western Brittany (UBO), European University of Brittany (UEB), Technopôle Brest-Iroise, 29280 Plouzané, France.
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Zou D, Gao K, Chen W. Photosynthetic carbon acquisition in Sargassum henslowianum (Fucales, Phaeophyta), with special reference to the comparison between the vegetative and reproductive tissues. PHOTOSYNTHESIS RESEARCH 2011; 107:159-68. [PMID: 21302029 DOI: 10.1007/s11120-010-9612-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2010] [Accepted: 12/18/2010] [Indexed: 05/30/2023]
Abstract
The photosynthetic oxygen evolution characteristics were examined in both vegetative (blade) and sexual reproductive (receptacle) tissues of Sargassum henslowianum (Fucales, Phaeophyta) from the Shenao bay of Nanao Island, China, to establish the mechanism of photosynthetic acquisition of inorganic carbon (Ci) in this species. In natural seawater (pH 8.1, ca. 2.2 mM Ci), irradiance-saturated net photosynthetic rate (NPR) was greater by 25.3% in blade than receptacle, whereas dark respiratory rate (DR) was 2-fold higher in receptacle than blade. NPR at pH 8.1 was nearly saturated with the 2.2 mM Ci for both blade and receptacle. However, the values of the half-saturation constant for Ci were sharply increased at pH 9.0. NPR was significantly affected, but DR was remained unchanged, with the variation of the pH values in seawater. The data from the final pH value derived from the pH-drift experiments and the comparison between the measured and theoretically estimated photosynthetic rates suggested that both blade and receptacle were capable of acquiring HCO(3)(-) in seawater. The inhibitors experiments showed that a HCO(3)(-) dehydration mechanism mediated by external carbonic anhydrase activity occurred in both the blade and receptacle tissues of S. henslowianum. The proton buffer TRIS had no inhibitory effect on NPR at normal pH value in natural seawater (pH 8.1), but it significantly depressed NPR at pH 9.0. This suggested that proton transport occurred at the outside of the plasma membrane facilitated the operation of the carbon acquisition at pH 9.0. It was proposed that the strategy of photosynthetic carbon acquisition at higher pH would prevent the alga from the damage of over-excitation and photoinhibition in case of sunshine and calm water. We concluded that the blade and receptacle tissues of S. henslowianum have similar mechanism of acquisition of exogenous Ci from seawater to drive photosynthesis; yet they are differentiated more or less with the photosynthetic properties.
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Affiliation(s)
- Dinghui Zou
- College of Environmental Science and Engineering, The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou 510006, China.
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