title: A detailed study of the volatile components of Plectranthus asirensis of Saudi Arabian origin.
abstract: Essential oil composition of Plectranthus asirensis grown in Saudi Arabia was chemically analysed for the first time by various gas chromatography techniques (GC-MS, GC-FID, Co-GC, LRI determination and database and literature searches) using two different stationary phase columns (polar and nonpolar). This analysis led to the characterisation of a total of 124 components representing 98.5% of the total oil composition. The results revealed that P. asirensis oil was mainly dominated by monoterpenoids (90.7%) in which most representative constituents were thymol (66.0 ± 0.36%), γ-terpinene (14.0 ± 0.18%), p-cymene (5.2 ± 0.06%) and β-caryophyllene (3.0 ± 0.03%). It is worth mentioning here that this is the first report on the phytochemical constituents of P. asirensis.
authors.affiliation: a Department of Chemistry , Princess Nourah bint Abdel-Rahman University , Riyadh , Saudi Arabia.
authors.forename: Muneera S M
authors.initials: MS
authors.lastname: Al-Saleem
authors.affiliation: b Department of Chemistry, College of Science , King Saud University , Riyadh , Saudi Arabia.
authors.forename: Merajuddin
authors.initials: M
authors.lastname: Khan
authors.affiliation: b Department of Chemistry, College of Science , King Saud University , Riyadh , Saudi Arabia.
authors.forename: Hamad Z
authors.initials: HZ
authors.lastname: Alkhathlan
mesh_terms: D002849:Chromatography, Gas; D000081005:Cyclohexane Monoterpenes; D000081007:Cymenes; D008401:Gas Chromatography-Mass Spectrometry; D039821:Monoterpenes / Q000032:analysis / Q000302:isolation & purification; D009822:Oils, Volatile / Q000032:analysis*; D031346:Plectranthus / Q000737:chemistry*; D000081223:Polycyclic Sesquiterpenes; D012529:Saudi Arabia; D012717:Sesquiterpenes / Q000302:isolation & purification; D013943:Thymol / Q000302:isolation & purification
chemical_list: D000081005:Cyclohexane Monoterpenes; D000081007:Cymenes; D039821:Monoterpenes; D009822:Oils, Volatile; D000081223:Polycyclic Sesquiterpenes; D012717:Sesquiterpenes; C007210:4-cymene; D013943:Thymol; C018669:gamma-terpinene; C024714:caryophyllene
keywords: Lamiaceae; P. asirensis; Plectranthus, essential oils; thymol; γ-terpinene