García-Quiles Lidia, Valdés Arantzazu, Fernández Cuello Ángel, Jiménez Alfonso, Garrigós María Del Carmen, Castell Pere
Tecnopackaging, Polígono Industrial Empresarium C/Romero N° 12 50720 Zaragoza, Spain.
Analytical Chemistry, Nutrition & Food Sciences Department, University of Alicante, P.O. Box 99, 03080. Alicante, Spain.
Polymers (Basel). 2019 May 31;11(6):945. doi: 10.3390/polym11060945.
Polyhydroxyalkanoates (PHAs) are nowadays considered competent candidates to replace traditional plastics in several market sectors. However, commercial PHA materials exhibit unsatisfactory smells that can negatively affect the quality of the final product. The cause of this typical rancid odour is attributed to oxidized cell membrane glycolipids, coming from Gram-negative production strains, which remain frequently attached to PHAs granules after the extraction stage. The aim of this research is the development of customised PHA bio-nano-composites for industrial applications containing organomodified nanoclays with high adsorbance properties able to capture volatile compounds responsible for the displeasing fragrance. To this end, a methodology for the detection and identification of the key volatiles released due to oxidative degradation of PHAs has been established using a headspace solid-phase microextraction technique. We report the development of nine bio-nano-composite materials based on three types of commercial PHA matrices loaded with three species of nanoclays which represent a different polar behaviour. It has been demonstrated that although the reached outcoming effect depends on the volatile nature, natural sepiolite might result in the most versatile candidate for any the PHA matrices selected.
聚羟基脂肪酸酯（PHA）如今被认为是在多个市场领域替代传统塑料的有力候选材料。然而，商业化的PHA材料存在令人不满意的气味，这可能会对最终产品的质量产生负面影响。这种典型的酸败气味的成因归因于来自革兰氏阴性生产菌株的氧化细胞膜糖脂，在提取阶段后，这些糖脂经常附着在PHA颗粒上。本研究的目的是开发定制的PHA生物纳米复合材料用于工业应用，其中包含具有高吸附性能的有机改性纳米粘土，能够捕获导致不悦气味的挥发性化合物。为此，已经建立了一种使用顶空固相微萃取技术检测和鉴定由于PHA氧化降解而释放的关键挥发性物质的方法。我们报告了基于三种商业PHA基质负载三种具有不同极性行为的纳米粘土开发的九种生物纳米复合材料的情况。已经证明，尽管达到的最终效果取决于挥发性物质的性质，但天然海泡石可能是所选任何PHA基质的最通用候选材料。
