Table 4.
Parameters estimated (i.e., fast, Df and slow, Ds diffusion coefficients and fraction f) from fitting of the combined diffusion-based model (Equation (10)) to the experimental release data of thymol and carvacrol from the PLA films.
| Thymol | Carvacrol | |||||||
|---|---|---|---|---|---|---|---|---|
| Temperature (°C) |
Df (10−6 cm2/s) |
Ds
(cm2/s) |
f | R2 | Df (10−6 cm2/s) |
Ds
(cm2/s) |
f | R2 |
| 50 | 0.04 | 10−13 | 0.72 | 0.997 | 0.04 | 10−13 | 0.60 | 0.988 |
| 100 | 0.4 | 10−10 | 0.72 | 0.948 | 0.4 | 10−10 | 0.60 | 0.968 |
| 122 | 0.9 | 10−9 | 0.72 | 0.939 | 1.2 | 10−9 | 0.60 | 0.962 |
| 142 * | 1.8 | 10−8 | 0.73 | 0.991 | 2.3 | 3 × 10−8 | 0.68 | 0.986 |
| 165 | 5.0 | 1.8 × 10−7 | 0.72 | 0.992 | 4.0 | 2 × 10−7 | 0.72 | 0.989 |
* In the case of carvacrol, this temperature is 144°C.