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Phytochemical Analysis and In Vitro Antimicrobial and Free-Radical-Scavenging Activities of the Essential Oils from Euryops arabicus and Laggera decurrens

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Department of Pharmacognosy, College of Pharmacy, King Saud University, P.O. BOX 2457, Riyadh 11451, Saudi Arabia
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Department of Pharmacognosy, Faculty of Pharmacy, Sana’a University, Sana’a, Yemen
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Author to whom correspondence should be addressed.
Molecules 2011, 16(6), 5149-5158; https://doi.org/10.3390/molecules16065149
Received: 23 May 2011 / Revised: 13 June 2011 / Accepted: 17 June 2011 / Published: 21 June 2011
(This article belongs to the Section Natural Products Chemistry)
The essential oils of the aerial part of two Asteraceae species, namely Euryops arabicus Steud. and Laggera decurrens (Vahl.) Hepper and Wood, were studied by GC and GC/MS. In parallel the antimicrobial and antioxidant activities were evaluated. The investigation led to the identification of 48 and 44 compounds for both plants, respectively. The essential oil of E. arabicus was rich in oxygenated sesquiterpenes (39.9%). The oil also contained a high content of sesquiterpene hydrocarbons (24.1%). Compounds such as caryophyllene oxide (8.6%), T-cadinol (7.0%), spathulenol (5.2%), (E)-β-caryophyllene (6.0%) and 2-epi-(E)-β-caryophyllene (6.0%) were the main constituents of the oil. Oxygenated monoterpenes also predominated in L. decurrens (46.3%). The thymoquinone-derivative, 3-methoxy-2-methyl-5-(1-methylethyl)-2,5-cyclohexadiene-1,4-dione (28.1%), thymol (5.7%) and eudesma-11-en-4a-ol (7.0%) were the most abundant constituents. Both essential oils showed antimicrobial activity with MIC-values between 0.13–5.25 mg/mL. Furthermore, only the essential oil of L. decurrens exhibited a strong antioxidant activity (91%) at 500 µg/mL. View Full-Text
Keywords: essential oils; Euryops arabicus; Laggera decurrens; antimicrobial; antioxidant; Yemen essential oils; Euryops arabicus; Laggera decurrens; antimicrobial; antioxidant; Yemen
MDPI and ACS Style

Mothana, R.A.; Alsaid, M.S.; Al-Musayeib, N.M. Phytochemical Analysis and In Vitro Antimicrobial and Free-Radical-Scavenging Activities of the Essential Oils from Euryops arabicus and Laggera decurrens. Molecules 2011, 16, 5149-5158.

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