Stable carbon isotope composition of monoterpanes in essential oils and crude oils

Abstract

Twenty-five monoterpanes from six types of essential oils and hydrogenated turpentine oil have been identified and their stable carbon isotope composition determined. Monoterpanes in essential oils sourced from terrestrial higher plants display a δ 13 C value in the range of −34‰-26‰, and mostly between −29‰ and −27‰. The δ 13 C value of any single monoterpane is very consistent in different essential oils. Acyclic monoterpanes show closer isotope composition between −28.6‰ and −26.2‰, with an average value of −27.7‰. In contrast, the isotope composition of cyclic monoterpanes is more scattered with an average value of −28.6‰. Isotopic fractionation with 13 C enrichment has been observed during both artificial and geological hydrogenation of monoterpenoids to monoterpanes, and this is more obvious for the acyclic monoterpenoids. In addition to higher plants, acyclic monoterpane 2,6-dimethylheptane in crude oil can also be originated from other organic inputs. monoterpenoids, stable carbon isotope, essential oil, crude oil Citation:Zhang D J, Wang P R, Mao Z C, et al. Stable carbon isotope composition of monoterpanes in essential oils and crude oils.

Gas chromatography combined with mass spectrometry, flame ionization detection and elemental analyzer/isotope ratio mass spectrometry for characterizing and detecting the authenticity of commercial essential oils of Rosa damascena Mill.

“…With regard to the application of GC/C/IRMS to essential oils, it has been reported that monoterpenes, including citronellol, from the essential oils of C3 plants, such as peppermint, mandarin, mixed camphor, cedar‐wood, turpentine and peony, have δ 13 C values in the range of −34 to −26‰, mostly between −29 and −27‰ . Linalool and linalyl acetate from lavender, spike lavender, bois de rose, bergamot, geranium, clary sage, petit grain and coriander have shown δ 13 C values from −32 to −25‰ .…”

Application of the monoterpane ratio (MTR) to distinguish marine oils from terrigenous oils and infer depositional environment in northern Tarim Basin, China

“…Previous studies have reported that the Paleozoic marine oils from the northern Tarim Basin have experienced multiple secondary alteration processes including biodegradation (Zhang et al, 2014a), evaporative fractionation (Ma, 1995;Zhang et al, 2014b), thermal maturation (Wang et al, 2006;Zhang et al, 2011b) and mixing (Wang et al, 2008;Zhang et al, 2014a), while the terrigenous oils and condensates from the Kuqa depression have been altered by evaporative fractionation (Zhang et al, 2010b;Gong et al, 2014) and thermal maturation (Zhang et al, 2011a).…”

Spectroscopic Analysis, Electromagnetic Interaction And Molecular Docking Investigation Of Isopropylcyclohexane

“…Isopropylcyclohexane is one of the most studied cyclohexane it is easy to process, chemically stable, and its synthetic applications have been a constant matter of investigation for so many years [1]. Isopropylcyclohexane belongs to a class of cyclohexane compounds containing a six -membered ring made up of hydrogen with the formula C9H18 [2].…”