Journal
CARBOHYDRATE POLYMERS
Volume 186, Issue -, Pages 184-191Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.01.039
Keywords
Spirulina; Scenedesmus; Nanochloropsis; Barrier properties; Tensile properties; SAXS/WAXS
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Funding
- Ramon y Cajal from the Spanish Ministry of Economy, Industry and Competitiveness [RYC-2014-158]
- Juan de la Cierva from the Spanish Ministry of Economy, Industry and Competitiveness [IJCI-2015-23389]
- Spanish Ministry of Economy, Industry and Competitiveness
- [2017022002]
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This work provides an in-depth analysis on how the addition of different microalgae species (Nannochloropsis, Spirulina and Scenedesmus) affected the structural and physicochemical properties of thermoplastic corn starch biocomposites. Structural characterization was conducted by combined SAXS/WAXS experiments and it was correlated with mechanical and barrier properties of the biocomposites. A water vapour permeability drop of ca. 54% was observed upon addition of the different microalgae species. The oxygen permeability and the mechanical properties of biocomposites containing Spirulina or Scenedesmus were not improved since the presence of microalgae hindered the re-arrangement and packing of the lamellar structure of starch polymeric chains, according to the SAXS results. Nannochloropsis caused a great reduction of the matrix rigidity and, the oxygen permeability was also improved. Therefore, all of these features make the Nannochloropsis biocomposites an alternative to generate biodegradable food packaging materials with the additional advantage that they can be easily scaled-up.
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