Table 2.
Values of the freeze-drying kinetic parameters obtained for the three grapefruit formulations (F1, F2, and F3) when the Page, logarithmic and Midilli-Kucuk models were used to fit the experimental data. Adjusted regression coefficient (Adj. R2) and root mean square error (RMSE) values.
| Sample Code | Model | |||
|---|---|---|---|---|
| Page | Logarithmic | Midilli-Kucuk | ||
| F1 | Model constants | k: 0.0070 n: 1.9515 |
a: 1.3825 k: 0.0533 c: −0.3251 |
a: 1.0092 k: 0.0069 n: 1.9757 b: 0.0006 |
| Adj. R2 | 97.33 | 91.61 | 95.67 | |
| RMSE | 0.0427 | 0.0774 | 0.0040 | |
| F2 | Model constants | k: 0.1027 n: 1.2363 |
a: 0.9906 k: 0.1788 c: 0.1672 |
a: 1.0000 k: 0.0550 n: 1.5989 b: 0.0019 |
| Adj. R2 | 99.08 | 98.74 | 99.89 | |
| RMSE | 0.0245 | 0.0244 | 0.0062 | |
| F3 | Model constants | k: 1.2000 n: 0.2813 |
a: 0.9387 k: 0.4015 c: 0.0612 |
a: 1.0000 k: 0.8671 n: 0.4670 b: 0.0014 |
| Adj. R2 | 99.92 | 99.93 | 99.98 | |
| RMSE | 0.0059 | 0.0044 | 0.0025 | |