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Table 1 Inhibitory effects of Qingzhuan tea fractions on α-glucosidase

From: In vitro α-glucosidase inhibitory activity of isolated fractions from water extract of Qingzhuan dark tea

Extracts

IC50 (mg/mL)

Regression equation

R 2

The crude water extract

2.47 ± 0.30 *

y = 0.120 × + 0.204

0.975

Chloroform fraction

No activity

  

Ethyl acetate fraction

2.27 ± 0.03 *

y = 2.131 × − 0.057

0.984

n-Butanol fraction

2.94 ± 0.44 *

y = 0.171 × − 0.002

0.991

Sediment fraction

3.02 ± 0.07 *

y = 0.042 × + 0.373

0.991

Residual aqua fraction

5.24 ± 0.11

y = 0.101 × − 0.029

0.987

Acarbose

4.64 ± 0.57

y = 0.045 × + 0.291

0.987

  1. Note: n=3, Mean ± SD
  2. * p > 0.01 when compared to acarbose