Development and characterization of hybrid corn starch-microalgae films: Effect of ultrasound pre-treatment on structural, barrier and mechanical performance
This work is aimed at evaluating the ability of the microalgae to partially substitute biodegradable materials with improved physicochemical properties. To this end, starch films containing the microalga Nannochloropsis gaditana sp. (N. gaditana) have been developed and characterized. Initially, different ultrasound treatments were evaluated for microalgae cell wall disruption. Although surfactant-aided sonication was the most efficient disruption method, the presence of the surfactant hampered continuous film formation. Subsequently, the ability of intact and ultrasound-treated N. gaditana cells to improve barrier properties of starch films was evaluated. Combined small and wide angle X-ray scattering experiments (SAXS/WAXS, respectively) evidenced slight nanostructural and crystallinity changes induced by the presence of N. gaditana cells. Incorporation of intact or ultrasound-treated microalgae into starch led to more hydrophobic films, with enhanced barrier properties for most of the formulations. However, the films containing the microalgae treated with the greatest ultrasound intensity, did not show any barrier improvement due to the plasticization promoted by the cell components (probably lipids) released during the ultrasound treatment, as suggested by SAXS/WAXS and the mechanical properties.
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Language: | English |
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Elsevier
2017-11-06
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Subjects: | Nannocloropsis gaditana sp., Ultrasound, Surfactant, Barrier properties, Contact angle, SAXS/WAXS, |
Online Access: | http://hdl.handle.net/10261/157113 http://dx.doi.org/10.13039/501100003329 |
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dig-iata-es-10261-1571132022-12-20T16:50:38Z Development and characterization of hybrid corn starch-microalgae films: Effect of ultrasound pre-treatment on structural, barrier and mechanical performance Fabra, María José Martínez Sanz, Marta Gómez-Mascaraque, Laura G. Coll, José María Martínez, Juan Carlos López-Rubio, Amparo Ministerio de Economía y Competitividad (España) Nannocloropsis gaditana sp. Ultrasound Surfactant Barrier properties Contact angle SAXS/WAXS This work is aimed at evaluating the ability of the microalgae to partially substitute biodegradable materials with improved physicochemical properties. To this end, starch films containing the microalga Nannochloropsis gaditana sp. (N. gaditana) have been developed and characterized. Initially, different ultrasound treatments were evaluated for microalgae cell wall disruption. Although surfactant-aided sonication was the most efficient disruption method, the presence of the surfactant hampered continuous film formation. Subsequently, the ability of intact and ultrasound-treated N. gaditana cells to improve barrier properties of starch films was evaluated. Combined small and wide angle X-ray scattering experiments (SAXS/WAXS, respectively) evidenced slight nanostructural and crystallinity changes induced by the presence of N. gaditana cells. Incorporation of intact or ultrasound-treated microalgae into starch led to more hydrophobic films, with enhanced barrier properties for most of the formulations. However, the films containing the microalgae treated with the greatest ultrasound intensity, did not show any barrier improvement due to the plasticization promoted by the cell components (probably lipids) released during the ultrasound treatment, as suggested by SAXS/WAXS and the mechanical properties. Synchrotron experiments were performed at NCD beamline at ALBA Synchrotron with the collaboration of ALBA staff (2016021658 project). M.J. Fabra, Marta Martinez-Sanz and L.G. Gómez-Mascaraque are recipients of a Ramon y Cajal (RYC-2014-158), Juan de la Cierva (IJCI-2015-23389) and predoctoral (call 2013) contracts from the Spanish Ministry of Economy, Industry and Competitiveness, respectively. Authors would also like to thank the Central Support Service for Experimental Research (SCSIE) of the University of Valencia for the electronic microscopy service. Peer reviewed 2017-11-08T08:49:07Z 2017-11-08T08:49:07Z 2017-11-06 artículo http://purl.org/coar/resource_type/c_6501 Algal Research 28: 80-87 (2017) 2211-9264 http://hdl.handle.net/10261/157113 10.1016/j.algal.2017.10.010 http://dx.doi.org/10.13039/501100003329 en Postprint https://doi.org/10.1016/j.algal.2017.10.010 Sí open Elsevier |
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Nannocloropsis gaditana sp. Ultrasound Surfactant Barrier properties Contact angle SAXS/WAXS Nannocloropsis gaditana sp. Ultrasound Surfactant Barrier properties Contact angle SAXS/WAXS |
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Nannocloropsis gaditana sp. Ultrasound Surfactant Barrier properties Contact angle SAXS/WAXS Nannocloropsis gaditana sp. Ultrasound Surfactant Barrier properties Contact angle SAXS/WAXS Fabra, María José Martínez Sanz, Marta Gómez-Mascaraque, Laura G. Coll, José María Martínez, Juan Carlos López-Rubio, Amparo Development and characterization of hybrid corn starch-microalgae films: Effect of ultrasound pre-treatment on structural, barrier and mechanical performance |
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This work is aimed at evaluating the ability of the microalgae to partially substitute biodegradable materials with improved physicochemical properties. To this end, starch films containing the microalga Nannochloropsis gaditana sp. (N. gaditana) have been developed and characterized. Initially, different ultrasound treatments were evaluated for microalgae cell wall disruption. Although surfactant-aided sonication was the most efficient disruption method, the presence of the surfactant hampered continuous film formation. Subsequently, the ability of intact and ultrasound-treated N. gaditana cells to improve barrier properties of starch films was evaluated. Combined small and wide angle X-ray scattering experiments (SAXS/WAXS, respectively) evidenced slight nanostructural and crystallinity changes induced by the presence of N. gaditana cells. Incorporation of intact or ultrasound-treated microalgae into starch led to more hydrophobic films, with enhanced barrier properties for most of the formulations. However, the films containing the microalgae treated with the greatest ultrasound intensity, did not show any barrier improvement due to the plasticization promoted by the cell components (probably lipids) released during the ultrasound treatment, as suggested by SAXS/WAXS and the mechanical properties. |
author2 |
Ministerio de Economía y Competitividad (España) |
author_facet |
Ministerio de Economía y Competitividad (España) Fabra, María José Martínez Sanz, Marta Gómez-Mascaraque, Laura G. Coll, José María Martínez, Juan Carlos López-Rubio, Amparo |
format |
artículo |
topic_facet |
Nannocloropsis gaditana sp. Ultrasound Surfactant Barrier properties Contact angle SAXS/WAXS |
author |
Fabra, María José Martínez Sanz, Marta Gómez-Mascaraque, Laura G. Coll, José María Martínez, Juan Carlos López-Rubio, Amparo |
author_sort |
Fabra, María José |
title |
Development and characterization of hybrid corn starch-microalgae films: Effect of ultrasound pre-treatment on structural, barrier and mechanical performance |
title_short |
Development and characterization of hybrid corn starch-microalgae films: Effect of ultrasound pre-treatment on structural, barrier and mechanical performance |
title_full |
Development and characterization of hybrid corn starch-microalgae films: Effect of ultrasound pre-treatment on structural, barrier and mechanical performance |
title_fullStr |
Development and characterization of hybrid corn starch-microalgae films: Effect of ultrasound pre-treatment on structural, barrier and mechanical performance |
title_full_unstemmed |
Development and characterization of hybrid corn starch-microalgae films: Effect of ultrasound pre-treatment on structural, barrier and mechanical performance |
title_sort |
development and characterization of hybrid corn starch-microalgae films: effect of ultrasound pre-treatment on structural, barrier and mechanical performance |
publisher |
Elsevier |
publishDate |
2017-11-06 |
url |
http://hdl.handle.net/10261/157113 http://dx.doi.org/10.13039/501100003329 |
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