Concentration-dependent anti-/pro-oxidant activity of natural phenolic compounds in bio-polyesters

Rossella Arrigo, Marilena Baiamonte, Nadka Tzankova Dintcheva, Giusy Curcuruto, Paola Rizzarelli

Risultato della ricerca: Articlepeer review

17 Citazioni (Scopus)

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.
Lingua originaleEnglish
pagine (da-a)21-28
Numero di pagine8
RivistaPolymer Degradation and Stability
Volume142
Stato di pubblicazionePublished - 2017

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Polymers and Plastics
  • Materials Chemistry

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