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Table 3 Antimicrobial activity and MIC of pure compounds as components of S. nigrum

From: Identification and antimicrobial activity of most representative secondary metabolites from different plant species

Bacteria Solamargine Solasonine Solamargine/solasonine (1:1 v/v)
ZoI (mm)a MIC (mg L−1) ZoI (mm)a MIC (mg L−1) ZoI (mm)a MIC (mg L−1)
Gram+
 Bacillus cereus (A1I) 15.0 ± 1.0A 5 ± 1H 14.0 ± 0.9A 5 ± 1H 15.0 ± 1.0A 5 ± 1H
 Bacillus thuringiensis (B7I2) 12.0 ± 0.9B 20 ± 1L 12.0 ± 0.8B 40 ± 1M 13.0 ± 1.0B 40 ± 1M
 Bacillus amyloliquefaciens (A5TI) 12.0 ± 0.9B 20 ± 1L 12.0 ± 1.0B 40 ± 1M 14.5 ± 1.0A 20 ± 1L
Gram−
 Pseudomonas orientalis (A14-1II) 13.0 ± 0.8B 40 ± 1M 13.0 ± 0.7B 40 ± 1M 13.5 ± 1.0B 40 ± 1M
 Stenotrophomonas maltophilia (B9TIII) 15.0 ± 0.9A 10 ± 1K 14.0 ± 0.8A 10 ± 1K 15.0 ± 1.1A 10 ± 1H
  1. Assays were performed in triplicate and results are the mean of three values ± standard deviation
  2. Different letters in superscript to numerical data indicate significant differences (p value < 0.05)
  3. aZoI: diameter of inhibition zone obtained after 24 h of incubation in agar well diffusion assays. ZoI < 10 mm: low antimicrobial activity; 11 < ZoI < 15 mm: middle antimicrobial activity; ZoI > 16 mm: high antimicrobial activity