Table 2 Inhibitory effect of the isolated compounds from Zea mays L. on protein tyrosine phosphatase 1β

Suramin^a

5

64.32

2.76

2.5

46.46

3.94

1

10.69

Protochtechuic acid (1)

100

<50.0

-

-

Vanillic acid (2)

100

<50.0

-

-

2,4,6-Trihydroxybenzoic acid (3)

100

< 50.0

-

-

p-Hydroxycinnamic acid (4)

100

< 50.0

-

-

Ferulic acid (5)

100

96.09

185.41

50

64.53

35.97

10

28.33

Hirsutrin (6)

100

< 50.0

-

-

3′-Methoxyhirsutrin (7)

50

85.89

64.04

25

36.84

30.61

10

15.02

Cyanidin-3-glucoside (8)

100

< 50.0

-

-

Pelargonidin-3-glucoside (9)

100

55.05

210.81

50

13.35

91.36

10

1.09

Peonidin-3-glucoside (10)

100

< 50.0

-

-

Cyanidin-3-(6”-malonylglucoside) (11)

50

91.73

54.06

25

36.24

28.95

10

18.54

Peonidin-3-(6”-malonylglucoside) (12)

100

< 50.0

-

-