Table 3 Content of antioxidant compounds in the methanol extract of freeze-dried powder of three Tuber species

Total phenols^h

446.60 ± 3.8^b

450.20 ± 3.4^b

735.01 ± 2.5^a

Total flavonoidsⁱ

900.22 ± 14.72^b

1355.43 ± 18.01^a

611.26 ± 7.40^c

Vitamin C^j

4.63 ± 0.01^a

4.61 ± 0.01^ab

4.59 ± 0.02^b

Total carotenoids^k

170.63 ± 3.06^b

144.33 ± 0.87^c

271.33 ± 0.66^a

Lycopene^j

236.03 ± 0.80^b

151.62 ± 0.32^c

355.18 ± 0.46^a

Gallic^j

nd

40.87 ± 0.42^b

39.83 ± 0.46^a

4-Hydroxybenzoic^j

24.84 ± 0.05^a

nd

21.93 ± 0.63^b

3,4-Dihydroxybenzaldehyde^j

62.71 ± 0.11^a

nd

nd

Homogentisic acid^j

61.03 ± 0.35^a

23.03 ± 015^c

64.13 ± 0.25^b

p-Coumaric acid^j

nd

nd

nd

o-Coumaric acid^j

nd

nd

nd