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. 2023 Nov 24;13:20638. doi: 10.1038/s41598-023-47839-6

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.