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Table 1 Antimicrobial activity of different polyamide resin elution fractions from Bletilla striata fibrous root ethanol extract

From: The anti-Staphylococcus aureus activity of the phenanthrene fraction from fibrous roots of Bletilla striata

Indicator strain Inhibition zone size (mm diameter)
EF20a EF40a EF60a EF80a EF95a Ampb
Staphylococcus aureus ATCC 25923 NA 12 ± 0.4 21 ± 0.7 NA NA 27 ± 0.6
Escherichia coli ATCC 35218 NA NA NA NA NA 20 ± 0.3
  1. aRelative inhibition zone (mm) at 100 μg per paper disc
  2. bRelative inhibition zone (mm) at 10 μg per paper disc
  3. Amp ampicillin
  4. NA no activity