Release of alpha-tocopherol from antioxidative low-density polyethylene film into fatty food simulant: influence of complexation in beta-cyclodextrin.
The release of alpha-tocopherol from two formulations (with and without complexation with beta-cyclodextrin) of low-density polyethylene (LDPE) film was examined. Specific migration studies were performed at 7.0 +/- 0.5 degrees C using plastic bags filled with 95% ethanol as a fatty food simulant. The amount of complexed and free (non-complexed) alpha-tocopherol migrating into the food simulant was followed by high-performance liquid chromatography (HPLC). It was concluded that complexation with beta-cyclodextrin had a significant effect on the release rate of the antioxidant. Using a mathematical model for the description of the migration, a decrease in diffusion coefficient (D) of one order of magnitude was calculated in the case of complexed alpha-tocopherol compared with the free form. Total migration of alpha-tocopherol from both films was observed, meaning that the partition coefficient of tocopherol was not influenced by incorporation with cyclodextrin. Thus, complexation might be the key to a long-lasting antioxidative effect of such kind of active packaging.
Siró
I
I
Faculty of Food Science, Department of Preservation, Corvinus University of Budapest, Ménesi út 45, H-1118 Budapest, Hungary. istvan.siro@uni-corvinus.hu
Fenyvesi
E
E
Szente
L
L
de Meulenaer
B
B
Devlieghere
F
F
Orgoványi
J
J
Sényi
J
J
Barta
J
J
D000975:Antioxidants; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004041:Dietary Fats; D004355:Drug Stability; D005503:Food Additives / Q000737:chemistry; D005506:Food Contamination / Q000032:analysis; D018857:Food Packaging / Q000379:methods*; D006358:Hot Temperature; D020959:Polyethylene; D024502:alpha-Tocopherol / Q000032:analysis / Q000737:chemistry*; D047392:beta-Cyclodextrins / Q000737:chemistry*
D000975:Antioxidants; D004041:Dietary Fats; D005503:Food Additives; D047392:beta-Cyclodextrins; D020959:Polyethylene; D024502:alpha-Tocopherol; C031215:betadex