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Table 4 Antioxidant properties of uncooked and cooked indigenous vegetables

From: Impact of cooking methods on the chemical and antioxidant composition of some indigenous vegetables used in different food dishes in Southeast Nigeria

Samples

% DPPH

ABTS (\(\mathrm{\mu mTE}/\mathrm{gFW}\))

FRAP (MmolFeII/100 g)

TPC (GAE/100 g)

TFC (TAE/100 g)

Uziza leaf (Piper guineense)

Uncooked

60.12c ± 0.03

12.76c ± 0.01

12.75b ± 0.03

20.17c ± 0.03

16.39b ± 0.01

Blanched

51.38c ± 0.02

10.25c ± 0.01

12.21b ± 0.01

19.28c ± 0.01

11.38b ± 0.01

Sautéed

65.66c ± 0.02

12.98c ± 0.02

13.42b ± 0.01

20.23c ± 0.01

16.51b ± 0.01

Nchuanwu (scent) leaf (Ocimum gratissimum)

Uncooked

74.03b ± 0.03

20.96a ± 0.03

21.18a ± 0.03

115.43a ± 0.03

40.71a ± 0.01

Blanched

60.35b ± 0.01

15.57a ± 0.01

17.20a ± 0.03

89.92a ± 0.03

33.68a ± 0.01

Sautéed

76.16b ± 0.02

27.50a ± 0.01

21.89a ± 0.01

116.74a ± 0.01

41.42a ± 0.01

Anara (garden egg) leaf (Solanum melongena)

Uncooked

80.25a ± 0.03

9.83d ± 0.02

10.29e ± 0.01

18.94e ± 0.01

2.43f ± 0.04

Blanched

69.32a ± 0.01

5.72e ± 0.01

8.47d ± 0.03

15.62d ± 0.02

2.01e ± 0.00

Sautéed

82.40a ± 0.01

6.57d ± 0.03

10.76d ± 0.02

16.32d ± 0.01

2.42f ± 0.01

Utazi leaf (Gongronema latifolium)

Uncooked

29.67f ± 0.02

3.31f ± 0.01

4.38f ± 0.01

5.82f ± 0.01

7.49d ± 0.01

Blanched

18.90f ± 0.00

3.00f ± 0.00

3.51e ± 0.01

2.45f ± 0.02

4.62d ± 0.01

Sautéed

34.51f ± 0.01

3.09f ± 0.03

4.16f ± 0.01

4.01f ± 0.01

6.13d ± 0.01

Okazi leaf (Gnetum africanum)

Uncooked

41.81e ± 0.01

10.41d ± 0.01

5.64e ± 0.01

17.53e ± 0.01

7.60c ± 0.00

Blanched

39.12e ± 0.02

6.92d ± 0.03

3.42f ± 0.03

13.85e ± 0.02

6.82c ± 0.01

Sautéed

42.52e ± 0.02

3.54e ± 0.03

5.24e ± 0.03

17.92e ± 0.03

7.51c ± 0.02

Onugbu (bitter) leaf (Vernonia amygdalina)

Uncooked

54.22d ± 0.01

15.86b ± 0.02

12.42c ± 0.01

29.83b ± 0.02

2.92e ± 0.02

Blanched

42.65d ± 0.01

11.62b ± 0.02

11.87c ± 0.03

20.70b ± 0.01

2.04e ± 0.01

Sautéed

48.29d ± 0.01

13.15b ± 0.01

12.32c ± 0.02

22.12b ± 0.01

2.98e ± 0.01

  1. Mean ± standard deviation for duplicate determination. Values with different superscripts in the same column are significantly different (p < 0.05)