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Table 1 Summary of results of antibacterial activity of essential oils

From: Comparison of the antibacterial activity of essential oils and extracts of medicinal and culinary herbs to investigate potential new treatments for irritable bowel syndrome

Vernacular name Botanical name Activity in disc diffusion assay Activity in turbido-metric assay Activity in zone of clearance assay
Coriander seed Coriandrum sativum ++ +++ +++
(0.0053) (5.82 × 10-5) (0.0002)
Fennel Foeniculum vulgare + +++ +
(0.0003) (8.01 × 10-6) (0.0027)
Grapeseed Vitis vinifera - - -
  (0.3216)  
Lavender Lavendula angustifolia + ++ +
(0.0039) (0.0031) (0.0011)
Lemon balm Melissa officinalis ++ ++ +++
(0.0041) (0.0008) (0.0014)
Lemon grass Cymbopogon citratus ++ ++ +
(0.0004) (0.0030) (0.0003)
Mandarin Citrus reticulata ++ +++ +
(0.0092) (3.39 × 10-5) (0.0484)
Neem Azadirachta indica - ND -
Peppermint Mentha piperita ++ +++ +++
(0.0390) (3.14 × 10-5) (0.0000)
Pine Pinus sylvestris +++ ++ ++
(0.0027) (0.0003) (0.0001)
Rosemary Rosmarinus officinalis + ++ +
(0.0000) (0.0085) (0.0036)
Sage Salvia lavendulifolia + +++ +
(0.0022) (3.39 × 10-6) (0.0021)
Tea tree Melaleuca alternifolia +++ +++ +++
(0.0079) (5.83 × 10-6) (0.0000)
Thyme Thymus vulgaris +++ +++ +
(0.0020) (5.84 × 10-5) (0.0193)
Ylang ylang Cananga odorata var. genuina +/- + -
  (0.0075) (0.0477)  
  1. Crosses denote the magnitude of the antibacterial activity; the numbers in brackets are the P values obtained from t tests comparing the size of the halos produced with the essential oils with those produced by grapeseed oil for the disc diffusion and zone of clearance assays, and from comparing the A600 of the turbidometric assay in the presence of essential oil after 6 hours with that lacking essential oil.