这项工作的目的是开发基于聚丙烯(PP)和聚乳酸(PLA)基质的活性包装,使用从橘皮中提取的高价值副产品作为食品包装应用的活性化合物。通过流延挤出获得基于PP和PLA的含和不含橙皮提取物(OPE)的不同薄膜,热,光学,和密封性能。获得的薄膜是透明的,但是当OPE成立时,透射率光谱下降,造成轻微的着色。机械性能受到OPE掺入的影响,随着PP膜的横向断裂伸长率和拉伸强度的增加,尽管发现的主要差异与聚合物本身有关。此外,密封强度也通过在PP基体中掺入OPE而增加。然而,热性能不受PP基体中OPE的影响,但PLA的稳定性略有下降。关于体外研究中的抗菌活性,对无公害李斯特菌的生长没有抑制作用,酿酒酵母,黑曲霉,或观察到大肠杆菌。最后,在体外研究中观察到2,2-二苯基-1吡喃基肼基(DPPH)自由基的抗氧化活性。这项研究的结果表明,在PLA和PP基质中掺入OPE的材料是可行的。获得的新材料可用于氧化敏感的新鲜产品的应用。
The aim of this work was to develop active packaging based on polypropylene (PP) and polylactic acid (PLA) matrices using a high value by-product extracted from orange peel as an active compound for food packaging applications. Different films with and without orange peel extract (OPE) based on PP and PLA were obtained via cast extrusion and characterized in terms of their mechanical, thermal, optical, and sealing properties. The films obtained were transparent, but when OPE was incorporated, the transmittance spectrum decreased, causing slight coloration. Mechanical properties were affected by the incorporation of OPE, as elongation at break and tensile strength increased in the cross-direction of the PP film, although the main differences found were related to the polymer itself. In addition, sealing strength also increased via the incorporation of OPE in the PP matrix. However, thermal properties were not affected by OPE in the PP matrix but slightly decreased stability in PLA. Regarding antimicrobial activity in in vitro studies, no inhibition of the growth of Listeria innocua, Saccharomyces cerevisiae, Aspergillus niger, or Escherichia coli was observed. Finally, antioxidant activity was observed in in vitro studies with 2,2-Diphenyl-1picrylhydrazyl (DPPH) radical. The results of this
study showed that the obtention of materials with OPE incorporated into the PLA and PP matrix is feasible. The new materials obtained can be used for applications of oxidation-sensitive fresh products.