Table 2: Processing impact on red beetroot compounds and antioxidant capacity.
Red beetroot variety |
Type of processing |
Total phenolics |
Betalains |
Author |
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Betacyanins |
Betaxanthins |
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Cardeal-F1 |
Extraction of beet root pomace |
6.66 ± 0.30b |
1.25 ± 0.03b |
0.74 ± 0.02a,b |
Vulic, et al. [68] |
|
Egyptian |
1.87 ± 0.08a |
0.46 ± 0.02a |
0.29 ± 0.01a |
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Bicor |
11.98 ± 0.57d |
1.99 ± 0.16c |
1.76 ± 0.04b,c |
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Kestrel |
8.23 ± 0.39c |
0.62 ± 0.16a |
0.46 ± 0.01a |
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With different maltodextrin ratios: 3:1/4:1/5:1 |
Microencapsulation of extract |
28.82 mg/100 g |
Azeredo, et al. [69] |
|||
90.71 mg/100 g |
||||||
106.09 mg/100 g |
||||||
135.98 mg/100 g |
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Red beetroot |
Juice extraction |
1169 mg GAE/L From these Flavonoids- 925 mg catechin equivalent/L pigments- 854 mg/L |
Antioxidant activity |
Fidelis, et al. [70] |
||
325 mg ascorbic acid equivalent/L by DPHH assay |
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Freeze -drying beetroot chips |
0.75 ± 0.06 GAE mg/g |
95.70% |
Vasconcellos, et al. [71] |
|||
Spray drying beetroot powder |
0.51 ± 0.07 GAE mg/g |
95.31% |
||||
Boiling at 100 oC/40 min |
2.79 ± 0.23 mg/g |
85.79% |
||||
Juice extraction |
3.67 ± 0.61 mg/g |
80.48% |
||||
Cereal Bar |
88.13 ± 5.16 mg/60 g |
91.97 ± 0.56% by TAPassay |
Santos Baiao et al. [55] |
|||
Drying-chips |
25.58 ± 0.72 mg/60 g |
91.03 ± 2.15% by TAP assay |
||||
Juice extraction |
10.79 ± 1.89 mg/60 g |
83.98 ± 3.18% by TAP assay |
||||
Blanching 90 ± 2 °C/7 min |
14.1 ± 1.1 mg gallic acid/100 g FW |
543.6 ± 4.2 mg Fe2+/100 g FW by FRAP assay |
Paciulli, et al. [66] |
|||
High pressure processing 650 MPa/3 min |
14.7 ± 2.9 mg gallic acid/100 g FW |
610.9 ± 100.2 mg Fe2+/100 g FW by FRAP assay |
||||
650 MPa/7 min |
12.9 ± 1.1 mg gallic acid/100 g FW |
490.9 ± 28.6 mg Fe2+/100 g FW by FRAP assay |
||||
650 MPa/15 min |
16.3 ± 4.4 mg gallic acid/100 g FW |
540.3 ± 13.3 mg Fe2+/100 g FW by FRAP assay |
||||
650 MPa/30 min |
19.6 ± 3.7 mg gallic acid/100 g FW |
634.3 ± 23.7 mg Fe2+/100 g FW by FRAP assay |
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Red beetroot |
Convection drying at 50 °C |
1.95 ± 0.005 mg/ml GAE |
0.348 ± 0.005 mg/g |
0.224 ± 0.0022 mg/g |
Nistor, et al. [30] |
|
60 °C |
1.82 ± 0.0025 mg/ml GAE |
0.424 ± 0.0048 mg/g |
0.31 ± 0.0017 mg/g |
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70 °C |
1.43 ± 0.0015 mg/ml GAE |
0.261 ± 0.0032 mg/g |
0.171 ± 0.0018 mg/g |
|||
50/40 + MW315e |
2.03 ± 0.0035 mg/ml GAE |
0.509 ± 0.0035 mg/g |
0.616 ± 0.0022 mg/g |
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60/40 + MW 315f |
5.33 ± 0.0045 mg/ml GAE |
0.631 ± 0.0042 mg/g |
0.795 ± 0.0019 mg/g |
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70/40 + MW315g |
3.06 ± 0.0015 mg/ml GAE |
0.655 ± 0.0029 mg/g |
0.601 ± 0.0017 mg/g |
amg GAE/g of dry weight of beetroot pomace, bmg betanin equivalents/g of dry weight of beetroot pomace, cmg vulgaxanthin-I equivalents/g of dry weight of beetroot pomace, dRatio V:Y ratio of violet (V) to yellow (Y) pigments, e50/40 + MW315-free convection at 50 ℃/forced convection at 40 ℃ with microwave at 315 W power, ffree convection at 60 ℃/forced convection at 40 ℃ with microwave at 315 W power, gfree convection at 70 ℃/forced convection at 40 ℃ with microwave at 315 W power.