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Table 1 MICs, FIC, and FIC index of amoxicillin, penicillin, quercetin, kaempferol against S. epidermidis

From: The synergy and mode of action of quercetin plus amoxicillin against amoxicillin-resistant Staphylococcus epidermidis

Strains

MIC (μg/mL)

FIC (μg/mL) = FIC index

Amx

Pen

Nis

Que

Kae

Amx + Que

Pen + Kae

S. epidermidis DMST 5038

16R

200R

256

256

>1024

4 + 64 = 0.5SI

64 + 64 = < 0.38SI

S. epidermidis DMST 5023

16R

200R

256

256

> 1024

4 + 64 = 0.5SI

64 + 64 = < 0.38SI

S. epidermidis DMST 5868

16R

200R

256

384

> 1024

4 + 96 = 0.5SI

64 + 64 = < 0.38SI

S. epidermidis DMST 4248

16R

200R

256

384

> 1024

4 + 96 = 0.5SI

64 + 64 = < 0.38SI

S. aureus ATCC 29213a

0.5S

0.5S

1

N/D

N/D

N/D

N/D

  1. Each compound was measured three times
  2. MIC Minimum inhibitory concentrations, FIC Fractional inhibitory concentration, Amx amoxicillin, Pen penicillin, Nis nisin, Que quercetin, Kae kaempferol
  3. S = Susceptible; R = resistant; SI = Synergistic interaction; N/D not determined
  4. aS. aureus ATCC 29213 was used as a positive control