Table 1

The IC50 of varied extracts for ACE inhibition
Sample number Portion of buckwheat Extracting solvent IC50 (μg mL-1) Equivalent activity to rutin
1 Groats, common Deionized water 283 (±20) 0.30
2 Groats, Tartary Deionized water 320 (±17) 0.27
3 Groats, common 20%(v/v) ethanol 218 (±11) 0.39
4 Groats, Tartary 20%(v/v) ethanol 237 (±35) 0.36
5 Groats, common 50%(v/v) ethanol 286 (±1) 0.30
6 Groats, Tatary 50%(v/v) ethanol 185 (±5) 0.46
7 Plants, common Deionized water 629 (±71) 0.14
8 Plants, Tatary Deionized water 989a 0.09
9 Plants, common 20%(v/v) ethanol 646 (±71) 0.13
10 Plants, Tatary 20%(v/v) ethanol 895a 0.10
11 Plants, common 50%(v/v) ethanol 331 (±3) 0.26
12 Plants, Tatary 50%(v/v) ethanol 313 (±18) 0.27
13 Hulls, common Deionized water 424 (±35) 0.20
14 Hulls, Tatary Deionized water 393 (±40) 0.22
15 Hulls, common 20%(v/v) ethanol 117 (±2) 0.74
16 Hulls, Tatary 20%(v/v) ethanol 168 (±19) 0.51
17 Hulls, common 50%(v/v) ethanol 30 (±2) 2.87
18 Hulls, Tatary 50%(v/v) ethanol 141 (±13) 0.61
control captopril 0.0019 45263
quercetin 39 2.21
rutin 86 1

a: The concentration of IC50 is greater than the maximum dissoluble amount. Data were calculated from the linear regression analysis of logarithmic plots.

Tsai et al.

Tsai et al. Chemistry Central Journal 2012 6:78   doi:10.1186/1752-153X-6-78

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