Headspace analysis, antimicrobial and anti-quorum sensing activities of seven selected African Commiphora species.
Rubegeta, E. Ahmad, A. Kamatou, G. P. P. Sandasi, M. Sommerlatte, H. Viljoen, A. M.
Rubegeta, E.
Ahmad, A.
Kamatou, G. P. P.
Sandasi, M.
Sommerlatte, H.
Viljoen, A. M.
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Abstract
The genus Commiphora has been widely used in traditional medicinal systems to treat pain, skin infections, diarrhoea and periodontal diseases. Oleo-gum resins of seven Commiphora species (C. myrrha, C. confusa, C. baluensis, C. pseudopaolii, C. guidotti, C. holtziana and C. kataf) were collected from Kenya and Ethiopia. Headspace analysis was determined using GCxGC–ToF–MS. In vitro evaluation of antimicrobial activity of acetone extracts were evaluated against a range of micro-organisms using microdilution assay. In addition, anti-quorum sensing activity of the tested Commiphora species was assessed qualitatively and quantitatively using Chromobacterium violaceum strain. α-Pinene (5.6–8.1%), β-caryophyllene (nd-16.5%), cis-β-ocimene (nd-7.4%), α-santalene (nd-40.8%), α-bourbonene (6.9–37.4%), β-elemene (nd-26.2%), curzerene (4.5–8.2%), p-cymene (1.8–54.5%), curzerenone (1.6–25.5%), (Z)-α-bisabolene (nd-10.4%), β-selinene (nd-9.8%), germacrene D (nd-8.4%), cresol methyl ether (nd-8.5%), 7-epi-sesquithujene (nd-8.8%), dehydro-aromadendrene (nd-36.9%), δ-elemene (nd31.1%) and spathulenol (0.2–10.4%) were the major volatile constituents. Principal component analysis showed three clusters corresponding to three chemotypes within the dataset. The extracts exhibited good to moderate antibacterial activity against a panel of selected micro-organisms (MIC values: 0.06–8.0 mg/mL). Commiphora holtziana displayed the best activity against Candida tropicalis (0.06–4.0 mg/mL), while C. holtziana and C. myrrha exhibited the best anti-quorum sensing activity by inhibiting violacein production
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Date
2018-04-21
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Elsevier
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Keywords
Commiphora, Headspace, Gas chromatography, Antimicrobial, Antiquorum sensing