Diffusion of linalool and methylchavicol from polyethylene-based antimicrobial packaging films.

摘要

The diffusion of linalool and methylchavicol from thin (45-50 mum) antimicrobial low-density polyethylene-based films was evaluated after immersion in isooctane and the effect of temperature (4, 10, or 25 degrees C) on the diffusion rate was evaluated. The kinetics of linalool and methylchavicol release showed a non-Fickian behavior at the lowest temperature. An increase in temperature from 4 degrees C to 25 degrees C resulted in an increase in the diffusion coefficient from 4.2 x 10--13 m2 s--1 to 2.5 x 10--12 m2 s--1 for linalool and from 3.5 x 10--13 m2 s--1 to 1.1 x 10--12 m2 s--1 for methylchavicol. The effect of temperature on the diffusion coefficient followed an Arrhenius-type model (r2 = 0.972) in relation to a time-response function with a Hill coefficient. Activation energies of 57.8 kJ mol--1 (linalool) and 42.8 kJ mol--1 (methylchavicol) were observed