Table 2.
Glass transition temperature (Tg), melt temperature (Tmax), fusion enthalpy (ΔH), surface free energy, polar component and dispersive component of the gelatin films incorporated with mint essential oil (MEO) at different concentrations
| Formulations (% MEO) |
Tg (°C) |
Tmax (°C) |
ΔH (J/g) |
Surface free energy (mN m−1) |
Polar component (mN m−1) |
Dispersive component (mN m−1) |
|---|---|---|---|---|---|---|
| Control (0) | 22.3 ± 2.0ab | 82.0 ± 0.1ab | 14.4 ± 1.4a | 59.2 ± 0.3a | 17.0 ± 0.1a | 43.0 ± 0.1a |
| A1 (0.06%) | 17.0 ± 1.0a | 80.2 ± 2.0a | 14.0 ± 0.1a | 59.0 ± 0.3a | 13.3 ± 0.5b | 45.3 ± 0.2b |
| A2 (0.13%) | 22.0 ± 3.0ab | 81.0 ± 0.4ab | 15.0 ± 1.0ab | 58.0 ± 0.1b | 12.0 ± 0.1c | 46.1 ± 0.2c |
| A3 (0.25%) | 24.2 ± 1.0ab | 81.0 ± 0.4ab | 16.0 ± 2.0ab | 56.2 ± 0.3c | 11.0 ± 0.4d | 45.4 ± 0.2b |
| A4 (0.38%) | 22.0 ± 2.0ab | 83.4 ± 0.1b | 17.2 ± 0.3ab | 55.1 ± 0.2d | 11.0 ± 0.3d | 44.4 ± 0.2d |
| A5 (0.50%) | 27.0 ± 2.0b | 83.1 ± 0.3ab | 18.4 ± 0.4b | 57.0 ± 0.1c | 8.3 ± 0.2e | 48.3 ± 0.1e |
Equal superscript letters in the columns for the same parameter indicate that the samples do not differ significantly (p > 0.05)