Table 2: Processing impact on red beetroot compounds and antioxidant capacity.

Red beetroot variety

Type of processing

Total phenolics

Betalains

Author

Betacyanins

Betaxanthins

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

Bicor

11.98 ± 0.57d

1.99 ± 0.16c

1.76 ± 0.04b,c

Kestrel

8.23 ± 0.39c

0.62 ± 0.16a

0.46 ± 0.01a

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

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

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

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

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

60/40 + MW 315f

5.33 ± 0.0045 mg/ml GAE

0.631 ± 0.0042 mg/g

0.795 ± 0.0019 mg/g

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.