CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal; LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.
CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal; LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.
Int J Biol Macromol. 2020 Nov 15;163:251-259. doi: 10.1016/j.ijbiomac.2020.06.231. Epub 2020 Jun 29.
Agrofood byproducts may be exploited as a source of biomolecules suitable for developing bioplastic materials. In this work, the feasibility of using starch, oil, and waxes recovered from potato chips byproducts for films production was studied. The recovered potato starch-rich fraction (RPS) contained an amylopectin/amylose ratio of 2.3, gelatinization temperatures varying from 59 to 71 °C, and a gelatinization enthalpy of 12.5 J/g, similarly to a commercial potato starch (CPS). Despite of its spherical and oval granules identical to CPS, RPS had a more amorphous structure and gave rise to low viscous suspensions, contradicting the typical B-type polymorph crystal structure and sluggish dispersions of CPS, respectively. When used for films production, RPS originated transparent films with lower roughness and wettability than CPS-based films, but with higher stretchability. In turn, when combined with RPS and CPS, oil or waxes recovered from frying residues and potato peels, respectively, allowed to develop transparent yellowish RPS- and CPS-based films with increased surface hydrophobicity, mechanical traction resistance, elasticity, and/or plasticity. Therefore, potato chips industry byproducts revealed to have thermoplastic and hydrophobic biomolecules that can be used to efficiently develop biobased plastics with improved surface properties and flexibility, opening an opportunity for their valorization.
农业食品副产物可以作为生物分子的来源加以利用，以开发生物塑料材料。在这项工作中，研究了从土豆片副产物中回收的淀粉、油和蜡用于薄膜生产的可行性。回收的富含淀粉的马铃薯部分（RPS）含有 2.3 的支链淀粉/直链淀粉比、从 59 到 71°C 变化的胶化温度以及 12.5 J/g 的胶化焓，与商业马铃薯淀粉（CPS）相似。尽管 RPS 的颗粒呈球形和椭圆形，与 CPS 相同，但 RPS 的结构更无定形，导致低粘性悬浮液，这分别与 CPS 的典型 B 型多晶晶体结构和缓慢分散性相矛盾。当用于薄膜生产时，RPS 生成的薄膜比基于 CPS 的薄膜透明度更高、表面更光滑、吸水性更低，但拉伸性更好。相反，当与从油炸残渣和马铃薯皮中回收的 RPS 和 CPS 以及油或蜡一起使用时，可以开发出具有增加的表面疏水性、机械牵引力阻力、弹性和/或塑性的透明的淡黄色 RPS 和 CPS 基薄膜。因此，土豆片产业副产物显示出具有热塑性和疏水性的生物分子，可用于高效地开发具有改善的表面性能和柔韧性的生物基塑料，为其增值开辟了机会。
