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Table 3 Quantitation of the identified phenolic compounds in the three T. indica fractions

From: Antioxidant or pro-oxidant and glutathione transferase P1-1 inhibiting activities for Tamarindus indica seeds and their cytotoxic effect on MCF-7 cancer cell line

Phenolic compound type

Identified compounds

T. indica fractions

Dichloromethane (μg/g DW)

% (w/w)

Ethyl acetate (μg/ g DW)

%

n-butanol (μg/ g DW)

%

Phenolic acids

Vanillic acid

20.01

7.15

12.5

3.45

96.6

12.4

Protocatechuic acid

119.69

42.75

146.7

40.52

307.5

39.5

p-hydroxybenzoic

78.34

28

7.80

2.15

ND

 

Syringic acid

ND

 

71.5

19.75

225.7

29

p-coumaric acid

ND

 

5.70

1.57

ND

 

Caffeic acid

ND

 

ND

 

15.0

1.93

Flavonoid

Rutin

ND

 

20.1

5.55

ND

 

Catechin

61.86

22.1

97.7

27

134

17.2

Total phenolics

280

100

362

100

779

100

  1. % (w/w) % calculated relative to the total concentration of identified phenolic compounds, ND not detected