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Table 2 Antibacterial activities of crude ethanolic extract of S. asper leaves and its fractions against a range of microorganisms determined by the broth microdilution method

From: Acid-base fractions separated from Streblus asper leaf ethanolic extract exhibited antibacterial, antioxidant, anti-acetylcholinesterase, and neuroprotective activities

Microorganisms

Minimum inhibitory concentration (MIC) in μg/mL

Crude extract

Neutral fraction

Acidic fraction

Basic fraction

Gram-positive bacteria

 Staphylococcus aureus (ATCC25923)

1000

1000

125

1000

 Bacillus subtilis (SU5)

1000

250

125

500

Gram-negative bacteria

 Escherichia coli (MG1655)

> 1000

> 1000

> 1000

> 1000

 Pseudomonas aeruginosa (PA14)

> 1000

> 1000

> 1000

> 1000

  1. MIC values are the lowest concentrations at which at least 95% bacterial growth reduction
  2. The tested concentration of samples ranged from 125 to 1000 μg/mL