Table 1.
The peroxidase activity (in U/g dm) and protein extractability (in %) of defatted oat whole meal (DOW) obtained from non-heat-treated, industrially heat-treated and lab-scale heat-treated oat groats. Abbreviations: DOWNHT = DOW from non-heat-treated oat groats, DOWIHT = DOW from industrially heat-treated oat groats, DOWLHT = DOW from lab-scale heat-treated oat groats, n.d. = not detected (below detection limit). The relative decrease in peroxidase activity (%) and protein extractability (%) compared to DOWNHT is shown as well. Values with a different capital letter within the same column are significantly different (α = 0.05). Standard deviations are depicted for the mean of triplicate measurements.
| Sample |
Peroxidase activity (U/g dm) | Peroxidase activity reduction (%) | Protein extractability (%) | Protein extractability reduction (%) | |||
|---|---|---|---|---|---|---|---|
| Temperature (°C) | Time (min) | Moisture content (%) | |||||
| DOWNHT | 6.92 ± 0.08 (BC) | – | 85.7 ± 2.4 (A) | – | |||
| DOWIHT | n.d. (K) | 100 | 20.6 ± 1.9 (Q) | 76 | |||
| DOWLHT | 80 | 15 | 13.0 | 6.65 ± 0.20 (CD) | 4 | 75.6 ± 2.5 (BCD) | 12 |
| 16.5 | 7.25 ± 0.20 (AB) | 0 | 81.0 ± 5.2 (AB) | 5 | |||
| 20.0 | 5.34 ± 0.20 (E) | 23 | 76.7 ± 4.4 (BC) | 10 | |||
| 30 | 13.0 | 7.50 ± 0.32 (A) | 0 | 84.5 ± 4.3 (A) | 1 | ||
| 16.5 | 4.66 ± 0.15 (F) | 33 | 75.8 ± 1.9 (BCD) | 11 | |||
| 20.0 | 4.08 ± 0.63 (G) | 41 | 68.5 ± 4.1 (EFG) | 20 | |||
| 45 | 13.0 | 6.44 ± 0.11 (CD) | 7 | 79.9 ± 4.8 (AB) | 7 | ||
| 16.5 | 5.17 ± 0.34 (EF) | 25 |
70.5 ± 2.1 (DEF) | 18 | |||
| 20.0 | 2.66 ± 0.13 (H) | 62 | 64.8 ± 4.7 (FGH) | 24 | |||
| 90 | 15 | 13.0 | 6.17 ± 0.18 (D) | 11 | 71.2 ± 2.4 (CDE) | 17 | |
| 16.5 | 2.98 ± 0.03 (H) | 57 | 71.3 ± 3.2 (CDE) | 17 | |||
| 20.0 | 0.70 ± 0.06 (IJ) | 90 | 60.2 ± 2.7 (H) | 30 | |||
| 30 | 13.0 | 4.92 ± 0.38 (EF) | 29 | 77.0 ± 2.9 (BC) | 10 | ||
| 16.5 | 1.13 ± 0.08 (I) | 84 | 66.5 ± 3.5 (EFG) | 22 | |||
| 20.0 | n.d. (K) | 100 | 53.6 ± 2.7 (IJ) | 37 | |||
| 45 | 13.0 | 3.79 ± 0.03 (G) | 45 | 63.7 ± 2.7 (GH) | 26 | ||
| 16.5 | 0.26 ± 0.15 (J) | 96 | 52.2 ± 4.2 (JK) | 39 | |||
| 20.0 | n.d. (K) | 100 | 46.3 ± 2.4 (L) | 46 | |||
| 100 | 15 | 13.0 | n.d. (K) | 100 | 59.0 ± 1.6 (HI) | 31 | |
| 16.5 | n.d. (K) | 100 | 41.9 ± 2.7 (LM) | 51 | |||
| 20.0 | n.d. (K) | 100 | 40.0 ± 3.9 (MN) | 53 | |||
| 30 | 13.0 | n.d. (K) | 100 | 46.4 ± 2.0 (KL) | 46 | ||
| 16.5 | n.d. (K) | 100 | 35.5 ± 3.7 (NO) | 59 | |||
| 20.0 | n.d. (K) | 100 | 31.4 ± 3.5 (OP) | 63 | |||
| 45 | 13.0 | n.d. (K) | 100 | 43.1 ± 2.4 (LM) | 50 | ||
| 16.5 | n.d. (K) | 100 | 32.0 ± 1.7 (OP) | 63 | |||
| 20.0 | n.d. (K) | 100 | 30.8 ± 2.3 (P) | 64 | |||