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Table 2 Synergistic effects of isorhamnetin + catechin, isorhamnetin + caffeic acid, isorhamnetin + rutin, isorhamnetin + ellagic acid, isorhamnetin + hyperoside and isorhamnetin + quercetin on MTS antioxidant activity

From: Synergistic effects and related bioactive mechanism of Potentilla fruticosa L. leaves combined with Ginkgo biloba extracts studied with microbial test system (MTS)

Combinations Ratios Test on growth inhibition
O E γ
Isorhamnetin + Catechin 5:1 0.967 ± 0.012* 1.189 ± 0.014 0.813
3:1 0.952 ± 0.016* 1.165 ± 0.018 0.817
1:1 0.921 ± 0.013* 1.094 ± 0.012 0.841
1:3 0.938 ± 0.008* 1.023 ± 0.010 0.917
1:5 0.957 ± 0.016* 0.999 ± 0.009 0.958
Isorhamnetin + Caffeic acid 5:1 1.834 ± 0.002* 1.538 ± 0.003 1.192
3:1 1.984 ± 0.018* 1.532 ± 0.018 1.295
1:1 2.254 ± 0.037* 1.515 ± 0.035 1.488
1:3 1.511 ± 0.016* 1.497 ± 0.011 1.009
1:5 1.497 ± 0.015* 1.491 ± 0.020 1.004
Isorhamnetin + Rutin 5:1 1.239 ± 0.009 1.248 ± 0.010 0.993
3:1 1.218 ± 0.013 1.217 ± 0.016 1.001
1:1 1.103 ± 0.012 1.122 ± 0.013 0.983
1:3 1.011 ± 0.011 1.027 ± 0.011 0.984
1:5 1.039 ± 0.012* 0.996 ± 0.013 1.043
Isorhamnetin + Ellagic acid 5:1 1.379 ± 0.015 1.389 ± 0.010 0.993
3:1 1.386 ± 0.009 1.330 ± 0.007 1.042
1:1 1.192 ± 0.009 1.152 ± 0.008 1.035
1:3 1.007 ± 0.009 0.973 ± 0.013 1.035
1:5 0.963 ± 0.015 0.914 ± 0.010 1.053
Isorhamnetin + Hyperoside 5:1 1.360 ± 0.015 1.367 ± 0.016 0.995
3:1 0.996 ± 0.011 0.987 ± 0.009 1.009
1:1 0.992 ± 0.007 0.994 ± 0.009 0.999
1:3 1.004 ± 0.008 1.000 ± 0.010 1.004
1:5 0.993 ± 0.010 1.002 ± 0.010 0.991
Isorhamnetin + Quercetin 5:1 1.384 ± 0.014 1.367 ± 0.014 1.012
3:1 1.674 ± 0.008 1.673 ± 0.007 1.001
1:1 1.501 ± 0.009* 1.490 ± 0.015 1.008
1:3 1.310 ± 0.015 1.307 ± 0.010 1.002
1:5 1.247 ± 0.086 1.246 ± 0.001 1.001
  1. Values are the mean of three replicates ± SD (n = 3)
  2. The asterisk indicates a significant difference between observed value and expected value (p < 0.05). O, observed value; E, expected value; γ, interaction index