Influence of trace metals, acids and ethanol in food-simulating liquids on the retention of alpha-tocopherol in low-density polyethylene film

Food Addit Contam. 2000 Aug;17(8):713-9. doi: 10.1080/02652030050083231.

Abstract

The retention of alpha-tocopherol (vitamin E) in low-density polyethylene (LDPE) film was investigated when in contact with different food-simulating liquids. Variations of the aqueous food simulants approved by the EU for testing of interactions between packaging materials and food, and an alternative fatty food simulant (95% aqueous ethanol) were used to study the influence of trace metals and acids, as well as variation in pH and ethanol concentration, on the stability of alpha-tocopherol in the LDPE film. The presence of trace metals in aqueous media accelerated loss of alpha-tocopherol from the film, while the addition of citric or ascorbic acid counteracted this loss. In contact with aqueous ethanol at a concentration of 50% or higher, the loss of alpha-tocopherol from the film was total. However, with solutions containing less than 50% ethanol, the antioxidant was almost completely retained in the film, unless the temperature was increased from 6 to 40 degrees C. For contact with solutions containing ethanol or trace metals, an increase in temperature resulted in a greater loss of alpha-tocopherol from the LDPE film.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acids / chemistry*
  • Antioxidants / chemistry
  • Ascorbic Acid / chemistry
  • Chelating Agents / chemistry
  • Chromatography, High Pressure Liquid / methods
  • Citric Acid / chemistry
  • Copper / chemistry
  • Ethanol / chemistry*
  • Food Contamination / analysis
  • Food Contamination / prevention & control
  • Food Packaging
  • Iron / chemistry
  • Polyethylene / chemistry*
  • Solvents / chemistry
  • Temperature
  • Trace Elements / chemistry*
  • Vitamin E / chemistry*

Substances

  • Acids
  • Antioxidants
  • Chelating Agents
  • Solvents
  • Trace Elements
  • Vitamin E
  • Citric Acid
  • Ethanol
  • Copper
  • Polyethylene
  • Iron
  • Ascorbic Acid