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Table 3 Antimicrobial activities of P. graveolens organic extracts and essential oil against fungi, foodborne and spoiling bacteria (4 mg /well)

From: Phytochemical composition and antimicrobial activities of the essential oils and organic extracts from pelargonium graveolens growing in Tunisia

  Inhibition zones diameters (mm)a
Extracts HE EtOAc MeOH WE EO Gentab
Strains
Bacterial strains  
Gram positive       
Bacillus subtilis ATCC 6633 - 27 ± 0.1 14 ± 0.4 - 22 ± 0.0 20 ± 0.2
Bacillus cereus ATCC 14579 - 17 ± 0.3 12 ± 0.8 - 26 ± 0.2 20 ± 0.4
Staphylococcus aureus ATCC 25923 - 25 ± 0.0 13 ± 0.6 - 24 ± 0.3 25 ± 0.8
Staphylococcus epidermis ATCC 12228 - 24 ± 0.6 20 ± 0.3 - 14 ± 0.4 20 ± 0.5
Enterococcus faecalis ATCC29212 - 18 ± 0.1 0 - 20 ± 0.3 12 ± 0.2
Micrococcus luteus ATCC 1880 - 21 ± 0.4 18 ± 0.5 - 15 ± 0.6 20 ± 0.7
Listeria monocytogenes (food isolate 2132) - 19 ± 0.2 18 ± 0.1 - 0 15 ± 0.0
Gram negative       
Salmonella enterica (food isolate) - 24 ± 0.2 14 ± 0.3 - 14 ± 0.1 18 ± 0.8
Klebsiella pneumoniae ATCC 10031 - 18 ± 0.2 15 ± 0.1 - 13 ± 0.3 12 ± 0.5
Fungal strains       
Aspergillus niger CTM 10099 - 34 ± 0.1 16 ± 0.2 - 18 ± 0.7 15 ± 0.9
Aspergillus flavus (food isolate) - 24 ± 0.2 18 ± 0.5 - 22 ± 0.2 10 ± 0.3
Fusarium graminearum (ISPAVE271) - 15 ± 0.7 13 ± 0.4 - 16 ± 0.4 14 ± 0.5
Fusarium oxysporum (CTM 10402) - 14 ± 0.3 23 ± 0.7 - 26 ± 0.1 14 ± 0.2
Fusarium culmorum (ISAVE21w) - 14 ± 0.2 17 ± 0.5 - 18 ± 0.6 12 ± 0.7
Alternaria alternata (CTM 10230) - 14 ± 0.1 17 ± 0.6 - 17 ± 0.5 14 ± 0.6
Rhizopus nigricans (CTM10150) - 17 ± 0.5 22 ± 0.2 - 26 ± 0.1 Nt
  1. Values are given as mean ± S.D. of triplicate experiment.
  2. a Diameters of inhibition zone of various P. graveolens organic and essential oil extracts including 6 mm disk diameters.
  3. Abreviations: Gentab: Gentamicin was used as a standard antibiotic at a concentration of 15 μg/well.
  4. Amphoc: Amphotrycine B was used as a standard antifungal at a concentration of 20 μg/well.