Table 8.
Retrogradation properties of starches from the two elite Thai rice cultivars grown in the net-house pot and open-field production systems.
| Cultivars | Production Systems | Retrogradation Properties | |||||
|---|---|---|---|---|---|---|---|
| To(r) (°C) |
Tp(r) (°C) |
Tc(r) (°C) |
∆T(r) (°C) |
∆H * (r) (J/g) |
R (%) |
||
| RD6 | Net-house pot | 46.04 ± 0.05 ** | 62.26 ± 0.05 ** | 70.28 ± 0.30 ** | 24.24 ± 0.25 ** | 5.12 ± 0.13 ** | 45.34 ± 1.02 ** |
| Open-field | 43.46 ± 0.21 | 54.52 ± 0.30 | 64.12 ± 0.12 | 20.67 ± 0.20 | 2.89 ± 0.07 | 19.22 ± 0.41 | |
| KDML105 | Net-house pot | 45.06 ± 0.24 | 54.56 ± 0.11 | 60.37 ± 0.25 | 15.31 ± 0.46 | 2.65 ± 0.03 | 23.87 ± 0.31 |
| Open-field | 46.74 ± 0.21 ** | 55.23 ± 0.20 * | 63.51 ± 0.36 ** | 16.78 ± 0.49 | 2.44 ± 0.11 | 22.71 ± 1.73 | |
Values are means ± SEM. Means in bold within each column with the * and ** symbols denote statistically significant difference between the two production systems at p ≤ 0.05 and p ≤ 0.01, respectively, by Student’s t-test (n = 3). Abbreviations: To(r) = onset temperature of retrograded starch; Tp(r) = peak temperature of retrograded starch; Tc(r) = conclusion temperature of retrograded starch; ∆T(r) = temperature range of retrograded starch (Tc(r)—To(r)); ∆H(r) = retrogradation enthalpy; and R (%) = the percentage of retrogradation. * Dry weight basis.