Migration of α-tocopherol from LDPE films to corn oil and its effect on the oxidative stability

Abril Zoraida Graciano-Verdugo, Herlinda Soto-Valdez*, Elizabeth Peralta, Pavlov Cruz-Zárate, Alma Rosa Islas-Rubio, Saúl Sánchez-Valdes, Armida Sánchez-Escalante, Natalia González-Méndez, Humberto González-Ríos

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

The migration of α-tocopherol (α-T) from low density polyethylene (LDPE) films, added with 20 (film A) and 40 mg g-1 (film B) to corn oil for 12 weeks at 5, 20 and 30 °C was determined. A LDPE film added with no α-T was used as control (film C). Diffusion coefficient (D) values for the film A system were 1.4 × 10-11, 7.1 × 10-11 and 30.3 × 10-11 cm2 s-1 at 5, 20 and 30 °C, respectively. Meanwhile, D values for the film B system were 1.3 × 10-11, 9.6 × 10-11 and 51.1 × 10-11 cm2 s-1 at the same temperatures. The activation energy (Ea) for the diffusion of α-T was 126.5 (film A) and 105.9 kJ mol-1 (film B). The effect of the migration of α-T on the oxidative stability of corn oil was evaluated by monitoring hexanal content by solid phase micro-extraction (SPME) and gas chromatography. The hexanal content in the oil showed that both films added with α-T resulted suitable to maintain the oxidative stability of the oil for about 16 weeks at 30 °C, compared to 12 weeks for the oil in contact with the film C.

Original languageEnglish
Pages (from-to)1073-1078
Number of pages6
JournalFood Research International
Volume43
Issue number4
DOIs
StatePublished - May 2010

Bibliographical note

Funding Information:
We gratefully acknowledge Dr. Rafael Auras and M.Sc. Gaurav Dhoot for their assistance with MATLAB program and to Dr. Rafael Gavara for his advice. This work was supported by funds from SAGARPA/CONACYT/COFUPRO (2003 C01 095), Fundación Produce Sonora and Qualyplast, S.A. de C.V. This work was also part of the multinational project CYTED XI.21.

Keywords

  • Activation energy
  • Active packaging
  • Diffusion
  • Lipid oxidation
  • Low density polyethylene
  • Migration
  • α-Tocopherol

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