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Use of isothermal and nonisothermal chemiluminescence measurements for comparison of stabilizing efficiency of hydroxytyrosol (3,4-dihydroxy-phenylethanol), α-tocopherol and irganox®1076 in polypropylene

Authors

  • M. Peltzer,

    Corresponding author
    1. Department of Analytical Chemistry, Nutrition and Food Sciences, University of Alicante, Alicante, Spain
    • M. Peltzer, Department of Analytical Chemistry, University of Alicante, Nutrition and Food Sciences, Alicante, Spain===

      J. Rychlý, Polymer Institute, Slovak Academy of Sciences, Dubravska cesta 9, 842 36, Bratislava, Slovak Republic===

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  • A. Jiménez,

    1. Department of Analytical Chemistry, Nutrition and Food Sciences, University of Alicante, Alicante, Spain
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  • L. Matisová-Rychlá,

    1. Polymer Institute, Slovak Academy of Sciences, Dubravska cesta 9, 842 36, Bratislava, Slovak Republic
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  • J. Rychlý

    Corresponding author
    1. Polymer Institute, Slovak Academy of Sciences, Dubravska cesta 9, 842 36, Bratislava, Slovak Republic
    • M. Peltzer, Department of Analytical Chemistry, University of Alicante, Nutrition and Food Sciences, Alicante, Spain===

      J. Rychlý, Polymer Institute, Slovak Academy of Sciences, Dubravska cesta 9, 842 36, Bratislava, Slovak Republic===

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Abstract

Hydroxytyrosol (3,4-dihydroxyphenylethanol) is a phenolic compound obtained during olive processing in oil manufacturing. It plays a role in enhancing the oxidative stability of olive oil with positive effects on human health. The raising interest towards the use of natural antioxidants as stabilizers in polymer formulations makes hydroxytyrosol a potential candidate to substitute synthetic antioxidants in polyolefin formulations. In this study, hydroxytyrosol was compared in antioxidant efficiency with two other compounds, one of them obtained from natural resources (α-tocopherol) and a synthetic commercial phenolic antioxidant (Irganox®1076). Chemiluminescence was used to as a tool to assess the increase in the polypropylene stability to thermo-oxidative degradation. A significant increase in the value of oxygen induction time with the initial concentration of natural antioxidants tested under isothermal conditions at 140, 150 and 160°C was observed. A comparison at the same concentration level (0.1 wt %) between the three antioxidants showed an order of stabilizing efficiency as: α-tocopherol > Irganox®1076 > hydroxytyrosol, but all them showed clearly their stabilization performance in polypropylene. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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