Food Safety and Preservation Department, IATA-CSIC, Avda. Agustin Escardino 7, 46980 Paterna, Valencia Spain.
Food Safety and Preservation Department, IATA-CSIC, Avda. Agustin Escardino 7, 46980 Paterna, Valencia Spain.
Carbohydr Polym. 2018 Apr 15;186:184-191. doi: 10.1016/j.carbpol.2018.01.039. Epub 2018 Jan 12.
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.
本工作深入分析了添加不同微藻物种（盐藻、螺旋藻和球等鞭金藻）如何影响热塑性玉米淀粉生物复合材料的结构和物理化学性质。通过结合小角 X 射线散射（SAXS）/广角 X 射线散射（WAXS）实验进行结构表征，并将其与生物复合材料的机械和阻隔性能相关联。添加不同微藻物种后，水蒸气透过率下降约 54%。然而，由于微藻的存在阻碍了淀粉聚合物链的层状结构的重排和堆积，因此含有螺旋藻或球等鞭金藻的生物复合材料的氧气透过率和机械性能并未得到改善，这一结果符合 SAXS 的结果。盐藻则极大地降低了基质的刚性，同时氧气透过率也得到了改善。因此，所有这些特性使得盐藻生物复合材料成为一种替代方案，可以生成具有生物降解性的食品包装材料，而且还有一个额外的优势，即它们可以很容易地规模化生产。
