پديد آورندگان :
Farhoodi Mehdi نويسنده , Emam-Djomeh Zahra نويسنده , Oromiehie Abdulrasul نويسنده , Ehsani Mohammad Reza نويسنده
چكيده لاتين :
Interactions within a package system refer to the exchange of mass and energy
inside the packaged food, the packaging material and the external environment.
Absorption of flavours into packaging material causes the loss of aroma or changes
in the mechanical properties of package. Therefore, it results in reduced perception of
the product quality. In this research, the effect of menthol absorption by polyethylene
terephthalate (PET) bottles on mechanical properties of the PET bottles was investigated
through tensile test. The PET samples containing yogurt drinks with 100 ppm initial
concentration of menthol were stored for about three months at 4؛C, 25؛C, and 45؛C
and the mechanical properties (tensile strength, modulus of elasticity and elongation)
of PET bottles were measured periodically during the storage time. A new technique,
dispersive liquid-liquid microextraction (DLLME), was used before GC analysis for
concentrating the acetone extraction solution containing menthol. The effect of menthol
on mechanical properties of PET bottles was compared through tensile test results of
the PET bottles containing yogurt drinks with 100 ppm menthol against PET bottles
containing yogurt drink without initial concentration of menthol solution. Maximum effect
of menthol on mechanical properties of PET bottles was observed on the samples
stored at 45؛C that could be due to the high amount of absorbed menthol at higher storage
temperatures. It was also found that tensile strength and modulus of elasticity of
PET bottles decreased with the absorption of menthol, while the elongation increased.
