Table 2.
Acetaldehyde, diacetyl, total phenolic content (TPC) and antioxidant contents of Rayeb milk made from mixture of cow and quinoa milk.
| Properties | Treatments | Storage period (day) | |||
|---|---|---|---|---|---|
| 1 | 7 | 14 | Means ± SD | ||
| Acetaldehyde (ppm) | T1 | 39.83 ± 0.03 | 19.35 ± 0.1 | 8.03 ± 0.03 | 22.4 ± 0.05E |
| T2 | 44.58 ± 0.10 | 26.49 ± 0.1 | 15.94 ± 0.04 | 29.00 ± 0.08A | |
| T3 | 41.90 ± 0.10 | 22.81 ± 0.01 | 12.15 ± 0.05 | 25.62 ± 0.05C | |
| T4 | 40.51 ± 0.20 | 19.96 ± 0.11 | 9.29 ± 0.10 | 23.25 ± 0.13D | |
| T5 | 42.63 ± 0.03 | 23.37 ± 0.20 | 15.65 ± 0.1 | 27.22 ± 0.11B | |
| Means ± SD | 41.89 ± 1.73a | 22.39 ± 2.66b | 12.21 ± 3.33c | ||
| Diacetyl (ppm) | T1 | 9.53 ± 0.10 | 12.34 ± 0.20 | 7.84 ± 0.04 | 9.90 ± 1.97E |
| T2 | 16.58 ± 0.05 | 21.89 ± 0.10 | 15.98 ± 0.02 | 18.15 ± 2.8A | |
| T3 | 13.64 ± 0.04 | 17.81 ± 0.01 | 13.56 ± 0.04 | 15.00 ± 2.10C | |
| T4 | 11.14 ± 0.14 | 14.34 ± 0.25 | 10.48 ± 0.30 | 11.99 ± 1.81D | |
| T5 | 15.78 ± 0.01 | 21.03 ± 0.03 | 15.16 ± 0.10 | 17.32 ± 2.79B | |
| Means ± SD | 13.33 ± 2.77b | 17.48 ± 3.83a | 12.60 ± 3.14c | ||
| TPC (mg GAE/100 g of sample) | T1 | 8.69 ± 0.10 | 11.12 ± 0.10 | 5.09 ± 0.09 | 8.32 ± 2.63E |
| T2 | 27.31 ± 0.30 | 33.44 ± 0.10 | 26.52 ± 0.10 | 29.09 ± 3.28A | |
| T3 | 17.25 ± 0.25 | 21.29 ± 0.01 | 14.32 ± 0.02 | 17.62 ± 3.03C | |
| T4 | 11.91 ± 0.01 | 14.18 ± 0.10 | 7.21 ± 0.20 | 11.10 ± 3.08D | |
| T5 | 21.34 ± 0.20 | 26.40 ± 0.10 | 20.43 ± 0.10 | 22.73 ± 2.78B | |
| Means ± SD | 17.31 ± 6.84b | 21.28 ± 8.38a | 14.71 ± 8.29c | ||
| Antioxidant (DPPH inhibition %) | T1 | 49.53 ± 0.03 | 53.0 ± 0.50 | 44.04 ± 0.04 | 48.85 ± 3.92E |
| T2 | 60.53 ± 0.03 | 72.7 ± 0.72 | 56.61 ± 0.01 | 63.21 ± 7.17A | |
| T3 | 54.48 ± 0.10 | 58.6 ± 0.10 | 47.65 ± 0.02 | 53.56 ± 4.80C | |
| T4 | 50.83 ± 0.20 | 57.09 ± 1.0 | 44.86 ± 0.10 | 50.92 ± 5.32D | |
| T5 | 58.63 ± 0.03 | 66.30 ± 0.3 | 53.12 ± 0.10 | 59.35 ± 5.73B | |
| Means ± SD | 54.80 ± 4.42b | 61.49 ± 7.25a | 29.24 ± 5.03c | ||
abcdLetters indication to significant differences between the samples of Rayeb ± SD; ABCD letters indication to significant differences between storage period of Rayeb ± SD; T1: Rayeb from 100% cow milk; T2: Rayeb from 100% quinoa milk; T3: Rayeb from 50% cow milk + 50% quinoa milk; T4: Rayeb from 75% cow milk + 25% quinoa milk; T5: Rayeb from 25% cow milk + 75% quinoa milk.