6533b83afe1ef96bd12a7049
RESEARCH PRODUCT
Concentration-dependent anti-/pro-oxidant activity of natural phenolic compounds in bio-polyesters
Giusy CurcurutoMarilena BaiamontePaola RizzarelliRossella ArrigoNadka Tzankova Dintchevasubject
Materials Chemistry2506 Metals and AlloysMaterials sciencePolymers and Plasticsmedicine.medical_treatmentCondensed Matter Physic02 engineering and technology010402 general chemistry01 natural sciencesAnti-/pro-oxidant activity; Natural stabilizers; Photo-oxidation; Polylactic acid; Condensed Matter Physics; Mechanics of Materials; Polymers and Plastics; Materials Chemistry; 2506; Metals and AlloysPolylactic acidFerulic acidCrystallinitychemistry.chemical_compoundPolylactic acidMaterials ChemistrymedicineVanillic acidOrganic chemistryPhoto-oxidationMechanics of MaterialNatural stabilizersNatural stabilizerPolymers and PlasticVitamin EMetals and Alloys021001 nanoscience & nanotechnologyCondensed Matter PhysicsPro-oxidantAnti-/pro-oxidant activity0104 chemical sciencesPolyesterchemistryMechanics of Materials25060210 nano-technologyQuercetindescription
Abstract In this work, the potential of several naturally occurring phenolic compounds, such as Ferulic Acid (FA), Vanillic Acid (VA), Vitamin E (VE) and Quercetin (Q), as stabilizers against the photo-oxidative degradation of Polylactic acid (PLA) has been assessed. Specifically, PLA-based films containing different amounts of considered stabilizers have been formulated and their photo-stability under UVB exposure has been evaluated. The preliminary characterization of the formulated films shows that all used stabilizers exert plasticizing action, as probed by rheological analysis, due to their low molecular weight. Moreover, no significant modification of the PLA crystallinity has been noticed in presence of used natural compounds. The study of the photo-oxidation behaviour of PLA-based systems suggests that, among all used natural phenolic compounds, FA and Q are suitable anti-oxidant for PLA, if they are added at low content. Surprisingly, all considered natural compounds, exert a pronounced pro-degradant action in PLA matrix, if their content overcomes a certain specific threshold. This finding has been related to the known concentration-dependent anti-/pro-oxidant activity of used phenolic compounds, that results exacerbated in presence of traces of transition metals, such as iron and copper.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-08-01 |