Composition and rheological properties of microalgae suspensions: Impact of ultrasound processing
In this study the rheological properties of aqueous suspensions of three microalgae species, Nannochloropsis gaditana, Scenedesmus almeriensis and Spirulina platensis, were investigated as a function of solids content, and related to their composition and microstructure. In addition, the impact of ultrasound processing on their structuring ability was also studied. The less rigid character of the Spirulina platensis cell walls (with very low carbohydrate contents) and the presence of extracellular components promoted cell-cell interactions, yielding suspensions which showed a shear thinning behaviour at lower concentrations than Nannochloropsis gaditana and Scenedesmus almeriensis. It is noteworthy that the three species showed different viscoelastic properties at 25 wt.% total solids. Spirulina platensis suspensions showed a more elastic behaviour and lower frequency dependence, characteristic of weak gels, whilst Nannochloropsis gaditana and Scenedesmus almeriensis behaved more like viscous liquids. The ultrasound treatment did not affect the cell wall integrity, but it promoted the release of intracellular components (some of which could have been partially degraded) and disrupted physical interparticle interactions in Nannochloropsis gaditana and Scenedesmus almeriensis. This has an impact on the rheological properties, increasing the viscosity of Nannochloropsis gaditana suspensions, whilst the viscosity of Scenedesmus almeriensis suspensions was reduced. The outcomes of this work give insights into the exploitation of these microalgae species in soft materials for food, pharma and other technological applications.
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Language: | English |
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Elsevier
2020-06-01
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Subjects: | Microalgae, Suspensions, Rheology, Cell wall polysaccharides, Ultrasounds, |
Online Access: | http://hdl.handle.net/10261/213777 http://dx.doi.org/10.13039/501100000780 |
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dig-iata-es-10261-2137772022-12-20T16:50:53Z Composition and rheological properties of microalgae suspensions: Impact of ultrasound processing Martínez Sanz, Marta Garrido Fernández, Agustín Mijlkovic, Ana Krona, Annika Martínez-Abad, Antonio Coll Marqués, José M. López-Rubio, Amparo López-Sánchez, Patricia European Commission Microalgae Suspensions Rheology Cell wall polysaccharides Ultrasounds In this study the rheological properties of aqueous suspensions of three microalgae species, Nannochloropsis gaditana, Scenedesmus almeriensis and Spirulina platensis, were investigated as a function of solids content, and related to their composition and microstructure. In addition, the impact of ultrasound processing on their structuring ability was also studied. The less rigid character of the Spirulina platensis cell walls (with very low carbohydrate contents) and the presence of extracellular components promoted cell-cell interactions, yielding suspensions which showed a shear thinning behaviour at lower concentrations than Nannochloropsis gaditana and Scenedesmus almeriensis. It is noteworthy that the three species showed different viscoelastic properties at 25 wt.% total solids. Spirulina platensis suspensions showed a more elastic behaviour and lower frequency dependence, characteristic of weak gels, whilst Nannochloropsis gaditana and Scenedesmus almeriensis behaved more like viscous liquids. The ultrasound treatment did not affect the cell wall integrity, but it promoted the release of intracellular components (some of which could have been partially degraded) and disrupted physical interparticle interactions in Nannochloropsis gaditana and Scenedesmus almeriensis. This has an impact on the rheological properties, increasing the viscosity of Nannochloropsis gaditana suspensions, whilst the viscosity of Scenedesmus almeriensis suspensions was reduced. The outcomes of this work give insights into the exploitation of these microalgae species in soft materials for food, pharma and other technological applications. This work was supported by the COST Action ES1408 European network for algal-bioproducts (EUALGAE). Peer reviewed 2020-06-08T14:38:10Z 2020-06-08T14:38:10Z 2020-06-01 artículo http://purl.org/coar/resource_type/c_6501 Algal Research August 2020; 49:101960 2211-9264 http://hdl.handle.net/10261/213777 10.1016/j.algal.2020.101960 http://dx.doi.org/10.13039/501100000780 en Postprint https://doi.org/10.1016/j.algal.2020.101960 Sí open Elsevier |
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Microalgae Suspensions Rheology Cell wall polysaccharides Ultrasounds Microalgae Suspensions Rheology Cell wall polysaccharides Ultrasounds |
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Microalgae Suspensions Rheology Cell wall polysaccharides Ultrasounds Microalgae Suspensions Rheology Cell wall polysaccharides Ultrasounds Martínez Sanz, Marta Garrido Fernández, Agustín Mijlkovic, Ana Krona, Annika Martínez-Abad, Antonio Coll Marqués, José M. López-Rubio, Amparo López-Sánchez, Patricia Composition and rheological properties of microalgae suspensions: Impact of ultrasound processing |
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In this study the rheological properties of aqueous suspensions of three microalgae species, Nannochloropsis gaditana, Scenedesmus almeriensis and Spirulina platensis, were investigated as a function of solids content, and related to their composition and microstructure. In addition, the impact of ultrasound processing on their structuring ability was also studied. The less rigid character of the Spirulina platensis cell walls (with very low carbohydrate contents) and the presence of extracellular components promoted cell-cell interactions, yielding suspensions which showed a shear thinning behaviour at lower concentrations than Nannochloropsis gaditana and Scenedesmus almeriensis. It is noteworthy that the three species showed different viscoelastic properties at 25 wt.% total solids. Spirulina platensis suspensions showed a more elastic behaviour and lower frequency dependence, characteristic of weak gels, whilst Nannochloropsis gaditana and Scenedesmus almeriensis behaved more like viscous liquids. The ultrasound treatment did not affect the cell wall integrity, but it promoted the release of intracellular components (some of which could have been partially degraded) and disrupted physical interparticle interactions in Nannochloropsis gaditana and Scenedesmus almeriensis. This has an impact on the rheological properties, increasing the viscosity of Nannochloropsis gaditana suspensions, whilst the viscosity of Scenedesmus almeriensis suspensions was reduced. The outcomes of this work give insights into the exploitation of these microalgae species in soft materials for food, pharma and other technological applications. |
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European Commission |
author_facet |
European Commission Martínez Sanz, Marta Garrido Fernández, Agustín Mijlkovic, Ana Krona, Annika Martínez-Abad, Antonio Coll Marqués, José M. López-Rubio, Amparo López-Sánchez, Patricia |
format |
artículo |
topic_facet |
Microalgae Suspensions Rheology Cell wall polysaccharides Ultrasounds |
author |
Martínez Sanz, Marta Garrido Fernández, Agustín Mijlkovic, Ana Krona, Annika Martínez-Abad, Antonio Coll Marqués, José M. López-Rubio, Amparo López-Sánchez, Patricia |
author_sort |
Martínez Sanz, Marta |
title |
Composition and rheological properties of microalgae suspensions: Impact of ultrasound processing |
title_short |
Composition and rheological properties of microalgae suspensions: Impact of ultrasound processing |
title_full |
Composition and rheological properties of microalgae suspensions: Impact of ultrasound processing |
title_fullStr |
Composition and rheological properties of microalgae suspensions: Impact of ultrasound processing |
title_full_unstemmed |
Composition and rheological properties of microalgae suspensions: Impact of ultrasound processing |
title_sort |
composition and rheological properties of microalgae suspensions: impact of ultrasound processing |
publisher |
Elsevier |
publishDate |
2020-06-01 |
url |
http://hdl.handle.net/10261/213777 http://dx.doi.org/10.13039/501100000780 |
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