Table 1.
Thermal properties of isopentyl caffeate (ICaf), β-cyclodextrin (β-CD), and inclusion complex (ICaf:β-CD) prepared by physical mixture (PM), kneading (KN), co-evaporation (CO) using molar ratios of (A) 0.25:1, (B) 1:1 and (C) 2:1.
Sample | Events | Tonset (°C) | Tendset (°C) | ∆H (J) |
---|---|---|---|---|
β-CD | 1 | 63.80 | 142.16 | 1.73 |
2 | 308.71 | 343.18 | 1.53 | |
ICaf | 1 | 127.63 | 133.77 | 0.22 |
PM 0.25:1 | 1 | 61.92 | 118.56 | 0.26 |
2 | 128.80 | 133.67 | 0.01 | |
3 | 220.79 | 228.54 | 0.02 | |
4 | 302.49 | 328.33 | 0.89 | |
KN 0.25:1 | 1 | 96.04 | 106.75 | 0.32 |
2 | 298.69 | 326.48 | 1.10 | |
CO 0.25:1 | 1 | 72.01 | 124.52 | 0.71 |
2 | 223.29 | 230.85 | 0.02 | |
3 | 292.41 | 327.90 | 1.56 | |
PM 1:1 | 1 | 64.30 | 103.73 | 0.76 |
2 | 127.67 | 134.52 | 0.05 | |
3 | 319.40 | 332.30 | 0.51 | |
KN 1:1 | 1 | 43.22 | 93.39 | 0.58 |
2 | 130.14 | 133.54 | 0.01 | |
3 | 309.49 | 320.60 | 0.48 | |
CO 1:1 | 1 | 129.19 | 132.79 | 0.01 |
2 | 318.53 | 320.40 | 0.51 | |
PM 2:1 | 1 | 128.11 | 132.68 | 0.09 |
2 | 313.51 | 325.19 | 0.27 | |
KN 2:1 | 1 | 130.08 | 133.17 | 0.04 |
2 | 311.19 | 326.05 | 0.38 | |
CO 2:1 | 1 | 126.87 | 133.22 | 0.04 |
2 | 291.04 | 322.76 | 0.64 |