Showing papers in "Journal of Essential Oil Research in 2004"
TL;DR: The essential oil obtained from the leaves of a Mentha spicata population grown wild in Greece was characterized by a very high content in linalool, i.e. 85.0–93.9% of the total oil.
Abstract: The seasonal variations of the essential oil content and composition of a Mentha spicata population grown wild in Greece were examined. The oil content ranged from 0.1–1.8%, with the maximum values in late summer/early autumn. The essential oil obtained from the leaves was characterized by a very high content in linalool, i.e. 85.0–93.9% of the total oil (highest percentage in mid-autumn). Other oil constituents occurring in much lower amounts were germacrene D (up to 4.2%), β-caryophyllene (up to 2.6%) and 1,8-cineole (up to 2.1%).
74 citations
TL;DR: The effects of the thyme oils and thymol on the hyphae cytomorphology of the studied fungi was an increased vacuolization of the cytoplasm and accumulation of lipid bodies, undulations of the plasmalemma, and alterations of the mitochondria and endoplasmic reticulum.
Abstract: The antifungal activity of commercial Thymus vulgaris oils on the development of mycelium of the the phytopathogenic fungi Fusariumsolani (Mart.) Sacc., Rhizoctoniasolani Kuhn and Colletotrichumlindemuthianum (Sacc. et Magn.) Briosi et Cav. was studied. The gas chromatography data showed that the essential oils were rich in thymol (22–38%) and its biogenetic precursors γ-terpinene and p-cymene. The carvacrol content was relatively low in all the oils tested, ranging between 1% and 2%. The fungicidal activity of the oils was correlated with their thymol content. The principal chemical components of thyme oils were then tested using the same concentrations as in the thyme oils. Only the fungicidal activity of thymol was high and close to that of the oils with the same thymol content. The effects of the thyme oils and thymol on the hyphae cytomorphology of the studied fungi was an increased vacuolization of the cytoplasm and accumulation of lipid bodies, undulations of the plasmalemma, and alteratio...
71 citations
TL;DR: The essential oils from wild and cultivated collections of Satureja hortensis L. hortense contained carvacrol as the major constituent and thymol was the main component in the wild forms of S. hortsensis.
Abstract: The essential oils from 20 samples of wild and cultivated collections of Satureja hortensis L. were investigated by GC and GC/MS. The oils from cultivated forms contained carvacrol (42–63%) as the major constituent. Thymol (29–43%) was the main component in the wild forms of S. hortensis.
68 citations
TL;DR: The oils demonstrated a range of bioactive properties, with the oils rich in phenolic monoterpenes (M. citriodora and T. zygis) being particularly active in both antioxidant and antibacterial test systems.
Abstract: Oils obtained by hydrodistillation from the aerial parts of Monarda citriodora var. citriodora, Myristica fragrans, Origanum vulgare ssp. hirtum, Pelargonium sp. and Thymus zygis were screened for antioxidative properties in a lipid-rich matrix as quantified by spectrophotometry using iron (II) sulphate and 2,2′-azobis(2-amidinopropane) dihydrochloride as sources of primordial free radicals. Furthermore, the antimicrobial properties of M. fragrans, O. vulgare, Pelargonium sp. and T. zygis were screened against 25 different genera of bacteria selected for their agricultural, economic and health significance. The oils demonstrated a range of bioactive properties, with the oils rich in phenolic monoterpenes (M. citriodora and T. zygis) being particularly active in both antioxidant and antibacterial test systems.
66 citations
TL;DR: In this paper, steam distillation of the aerial parts of Mentha longifolia (L.) Huds. ssp. growing in Sudan yielded oil contents of 1.8% and 0.9%, respectively.
Abstract: Steam distillation of the aerial parts of Mentha longifolia (L.) Huds. ssp. schimperi Briq. and Mentha spicata L. growing in Sudan yielded oil contents of 1.8% and 0.9%, respectively. Analysis of the oils by GC and GC/MS revealed that both oils were found to be rich in carvone. Twenty-two compounds were identified in each oil, the major ones being carvone (67.3%, 78.9%), limonene (13.5%, 8.8%), 1,8-cineole (5.4%, 2.6%), menthone (2.9%, 1.6%), linalool (2.8%, 3.2%) and isomenthone (1.2%, 0.6%) for M. longifolia and M. spicata, respectively.
64 citations
TL;DR: In vitro evaluation of the leaf oils of Lippia origanoides showed significant antimicrobial activity against Escherichia coli, Staphylococus aureus,StaphylOCocus aUREus MRSA, Candida albicans and Candida tropicalis.
Abstract: Analyses of the leaf oils from three colletions of Lippia origanoides H.B.K. by GC/MS and 1H- and 13C-NMR showed a similar chemical composition. Carvacrol (33.5–42.9%) was identified as the major component together with γ-terpinene (8.0–10.5%), thymol (5.1–8.4%), methyl thymol (6.1–8.7%) and p-cymene (11.9–15.8%). In vitro evaluation of the oils showed significant antimicrobial activity against Escherichia coli, Staphylococus aureus, Staphylococus aureus MRSA, Candida albicans and Candida tropicalis.
63 citations
TL;DR: In this paper, the composition of six wild Greek populations of the O. vulgare ssp. hirtum and four of the latter taxon were analyzed by means of GC and GC/MS, and a PCA analysis showed that Turkish oregano oils had higher amounts of sabinene, myrcene, γ-terpinene, borneol and carvacrol.
Abstract: Aiming to find out if any distinction between the Greek (Origanum vulgare ssp. hirtum) and Turkish oregano (O. onites) essential oils exists, the composition of six wild Greek populations of the former and four of the latter taxon were analyzed by means of GC and GC/MS. A PCA analysis showed that Turkish oregano oils had higher amounts of sabinene, myrcene, γ-terpinene, borneol and carvacrol, and Greek oregano oils had higher p-cymene content. The latter were further divided into two subgroups, distinguished respectively by their thymol and carvacrol content. A comparison of our results with the published information showed that p-cymene percentages>14% and/or thymol>6% is found only in Greek oregano, while borneol content>2% is found only in Turkish oregano oils.
55 citations
TL;DR: A patchouli oil from Indonesia was analyzed qualitatively and quantitatively by GC (FID) and GC/MS as discussed by the authors, using different ionization techniques in mass spectrometry (EI, NCI and PCI with ammonia and deuterated ammonia as reagent gases).
Abstract: A patchouli oil from Indonesia was analyzed qualitatively and quantitatively by GC (FID) and GC/MS. Using different ionization techniques in mass spectrometry (EI, NCI and PCI with ammonia and deuterated ammonia as reagent gases), 41 compounds were separated, 28 of which (92.9% of the total oil) were identified. Four new compounds were found in this oil: γ-gurjunene (2.2%), germacrene D (0.2%), aciphyllene (3.4%) and 7-epi-α- selinene (0.2%).
54 citations
TL;DR: Thymol was found to be the most abundant constituent and Thyme possessed a higher oil yield and the oil was richer in oxygenated compounds when harvested in the spring.
Abstract: Essential oils from the leaves of Thymus vulgaris L. collected from Caxias do Sul (Rio Grande do Sul State, Brazil) were isolated by hydrodistillation with an average oil yield of 0.25%. Twenty-two components were identified by GC and GC/MS analysis. Thymol was found to be the most abundant constituent (31.5–52.4%), followed by p-cymene (17.1–34.4%). Thyme possessed a higher oil yield and the oil was richer in oxygenated compounds when harvested in the spring.
54 citations
TL;DR: The essential oil of the leaves of Artemisia nilagirica from South India was investigated by GC and GC/MS, which lead to the identification of 59 compounds including α-thujone and borneol, which inhibited the growth of the plant pathogen Phytophthora capsici.
Abstract: The essential oil of the leaves of Artemisia nilagirica from South India was investigated by GC and GC/MS, which lead to the identification of 59 compounds including α-thujone (41.9%), borneol (10.8%), and β-thujone (9.1%). The leaf oil inhibited the growth of the plant pathogen Phytophthora capsici. This property has been attributed to the presence of thujones in the oil.
54 citations
TL;DR: Six species of Tagetes, grown in northern Italy, were evaluated for their morpho-phenological characteristics, biomass yield and essential oil composition and, piperitone, (E)-tagetone, terpinolene and (E-ocimenone were those more abundant respectively.
Abstract: Six species of Tagetes (T. erecta, T. filifolia, T. lucida, T. minuta, T. patula and T. tenuifolia), grown in northern Italy, were evaluated for their morpho-phenological characteristics, biomass yield and essential oil composition. The species showed marked differences in plant height, shape, flower size, habit and vegetative cycle length as found for T. filifolia which finished the vegetative cycle without reaching the flowering stage. The leaves always showed fresh material yields many fold higher than flowers (on average 26.8 and 4.4 t ha,−1 respectively). Tagetes erecta and T. patula produced significantly higher amounts of flowers than the other species (7.3 and 6.4 t ha,−1 respectively), whereas Tagetes lucida and T. filifolia were those with the highest yields of leaves (41.9 and 33.3 t ha,−1 respectively). The oils isolated by steam distillation from the flowers and leaves, were analyzed by GC and GC/MS. The flowers and the leaves of each species showed very similar qualitative oil compo...
TL;DR: The oils showed antifungal activity against 13 strains of phytopathogenic fungi; the activity of the oil extracted from plants grown at 1000 m above sea level showed higher activity.
Abstract: The two essential oils isolated from plants of hyssop (Hyssopus officinalis L. ssp. officinalis) grown in two different localities near Urbino (Marche, Italy) were analyzed by GC and GC/MS. The major components were pinocamphone (34% and 18.5%), isopinocamphone (3.2% and 29%) and β-pinene (10.5% and 10.8%). The major differences in the composition of the oils were detectable in the ratio of pinocamphone/isopinocamphone, in the percentage of linalool (0.2% and 7.9%) and camphor (0.3% and 5.3%). The oils showed antifungal activity against 13 strains of phytopathogenic fungi; the activity of the oil extracted from plants grown at 1000 m above sea level showed higher activity.
TL;DR: Results support the notion that S. montana oil has a role as both a pharmaceutical and a preservative as well as antimicrobial activity against bacteria and fungal organisms.
Abstract: The essential oils obtained from Satureja montana L. harvested in central part of Dalmatia (Croatia) at three ontogenical stages were evaluated for their chemical composition and antimicrobial activity. GC/MS analyses revealed the presence of 33 compounds in the oils. Carvacrol (52.4>26.2>16.1%) was found to be the main constituent especially before flowering while p-cymene (3.8<15.2<25.6%) increased through flowering. The antimicrobial activity of S. montana oils against five Gram-negative bacteria (Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis, Pseudomonas aeruginosa, Salmonella typhi), four Gram-positive bacteria (Bacillus subtilis, Bacillus cereus, Staphylococcus aureus, Streptococcus faecalis) and five pathogenic fungi (Aspergillus fumigatus, Aspergillus niger, Candida albicans, Candida rugosa and Saccharomyces cerevisiae) was evaluated using the agar-plate dilution assay. The oil showed the strongest activity against all tests strains, with the exception of Pseudomonas aerugino...
TL;DR: The seed oils of three accessions of Nigella sativa and N. damascena, sown on different dates, were obtained by Likens-Nickerson hydrodistillation and analyzed by GC/MS to characterize the main components of N. sativa oil.
Abstract: The seed oils of three accessions of Nigella sativa and N. damascena, sown on different dates, were obtained by Likens-Nickerson hydrodistillation and analyzed by GC/MS. The main components of N. sativa oil were p-cymene (33.8 %) and thymol (26.8 %), with only small amounts of thymoquinone (3.8 %). N. damascena oil was characterized by almost 100% sesquiterpenes, of which β-elemene (73.2 %) represented about three-quarters of the total amount.
TL;DR: Eryngium foetidum is a perennial herb native to tropical America whose leaves are used as food seasoning and the essential oil was collected in a Clevenger-type trap and analyzed by GC and GC/MS.
Abstract: Eryngium foetidum is a perennial herb native to tropical America whose leaves are used as food seasoning. The aerial parts of this plant were hydrodistilled and the essential oil was collected in a Clevenger-type trap. The oil was analyzed by GC and GC/MS. The main constituents were 2,4,5-trimethyl-benzaldehyde (27.7%), (E)-2-dodecenal (27.5%), carotol (8.8%), 3-dodecenal (5.2%) and γ-terpinene (3.8%).
TL;DR: In this article, the main constituents in Turkish materials collected in different periods of vegetation were found as main constituents of O. majorana in different regions of Turkey, including the southwestern part of the Mediterranean region.
Abstract: Origanum majorana L. (Lamiaceae) has two chemotypes in Turkey. The type growing in the southwestern part of the Mediterranean region is characterized by rich oil yield and high carvacrol content. This type known as ‘beyaz kekik’ (white oregano) and is commercialized. The more usual sweet marjoram (mercankosk) type of O. majorana grows in the western part of Turkey. This type is poor in oil and contains only trace amounts of carvacrol. cis-Sabinene hydrate (30–44%) and terpinen-4-ol (8–14%) were found as main constituents in the Turkish materials collected in different periods of vegetation. Origanum x majoricum Cambess. is a known hybrid of O. majorana L. x O. vulgare L. ssp. virens (Hoffm. et Link) Ietswaart and is also cultivated in Turkey. Sweet marjoram contains cis-sabinene hydrate (24–37%) and terpinen-4-ol (6–13%) in its oil.
TL;DR: The nematicidal activity of the essential oils isolated from Aloysia triphylla, A. polystachya, Lippia juneliana, L. turbinata, and Heterotheca latifolia from San Luis, Argentina were evaluated using in vitro experiments as mentioned in this paper.
Abstract: The nematicidal activity of the essential oils isolated from Aloysia triphylla, A. polystachya, A. gratissima, Lippia juneliana, L. turbinata (from two locations of San Luis: Lujan and Merlo) and Heterotheca latifolia from San Luis, Argentina, were evaluated using in vitro experiments. The oils of A. triphylla, L. juneliana and L. turbinata showed the highest nematicidal activity among the tested oils, killing more than 80% of the juveniles of the root-knot nematode Meloidogyne sp. at 667 μL/L concentration. Analysis of the oils revealed that they possess the following main components: Aloysia triphylla—α-thujone (22.9%), cis-carveol (17.5%), carvone (13.2%) and limonene (12.7%); A. polystachya—α-thujone (80.0%) and sabinene (5.1%); A. gratissima—cadinol (17.4%), caryophyllene oxide (15.8%), limonene oxide (5.3%), chrysanthenyl acetate (5.6%) and β-caryophyllene (4.8%); L. juneliana—piperitenone oxide (36.5%), limonene (23.1%), camphor (8%) and spathulenol (6.5%); L. turbinata—limonene (43.3–60.6...
TL;DR: In this article, the chemical composition of the essential oils obtained by hydrodistillation of the stems (before and at full flowering stage), unripe and ripe seeds of Heracleum persicum L. were investigated by a combination of GC and GC/MS.
Abstract: Chemical composition of the essential oils obtained by hydrodistillation of the stems (before and at full flowering stage), unripe and ripe seeds of Heracleum persicum L. were investigated by a combination of GC and GC/MS. Twenty-four components were characterized for the stem oil before flowering with (E)-anethole (47.0%), terpinolene (20.0%), γ-terpinene (11.6%) and limonene (11.5%) as the main constituents. At full flowering stage, 33 compounds were identified in the stem oil with (E)-anethole (60.2%), terpinolene (11.3%) and γ-terpinene (7.1%) as the major components. Among the 30 compounds identified in the seed oil of H. persicum, the major constituents were hexyl butyrate (22.5% and 35.5%), octyl acetate (19% and 27%) and hexyl isobutyrate (9.1% and 3.2%) in unripe and ripe seeds, respectively.
TL;DR: In this paper, a hydrodistilled oil from the aerial parts of Eryngium billardieri F. Delaroche was analyzed by a combination of GC and GC/MS.
Abstract: A hydrodistilled oil from the aerial parts of Eryngium billardieri F. Delaroche was analyzed by a combination of GC and GC/MS. Forty-two components were identified representing more than 97.2% of the oil. The main constituents of the oil were α-muurolene (42.0%), β-gurjunene (17.0%), δ-cadinene (6.2%) and valencene (5.7%).
TL;DR: The chemical composition of the essential oils, obtained by separate distillation of the leaves, branches and fruits of Pistacia lentiscus from Tuscany (Italy), was analyzed and identified by GC and GC/MS as discussed by the authors.
Abstract: The chemical composition of the essential oils, obtained by separate distillation of the leaves, branches and fruits of Pistacia lentiscus from Tuscany (Italy), was analyzed and identified by GC and GC/MS The leaf oil contained α-pinene (161–253%), limonene (66–123%), terpinen-4-ol (76–127%) and germacrene D (96–143%) as major components The branch oil contained α-pinene (344–462%), myrcene (63–116%) and limonene (81–130%), while the fruit oil contained α-pinene (75–112%), myrcene (682–710%) and limonene (96–197%) as major constituents Little differences in composition were found between samples collected in different seasons and years, while epigenetic variations were observed for samples of oils from different sources
TL;DR: The composition of the essential oil of Daucus carota L. ssp. carota seeds (fruits) collected from ecologically clean localities and in polluted areas near the roads was analyzed by GC and GC/MS as discussed by the authors.
Abstract: The composition of the essential oil of Daucus carota L. ssp. carota seeds (fruits) collected from ecologically clean localities and in polluted areas near the roads was analyzed by GC and GC/MS. The oils from all samples were of the sabinene (28.2–37.5%) chemotype. The other major constituents were α-pinene (16.0–24.5%), terpinen-4-ol (4.6–7.5%), γ-terpinene (2.9–6.0%) and limonene (2.3–4.0%). The oils consisted of 83.4–95.1% monoterpenoids (monot-erpene hydrocarbons made up 60.5–74.8%) and 3.4–10.5% sesquiterpenoids. The ratio of sesquiterpenoids and monoterpenoids from clean localities and from the areas near the roads was found to be different (probably due to pollution). Identified compounds made up 92.1–99.5% of the oil.
TL;DR: The essential oil content and the C-3 oxygenated p-menthane compounds of Mentha pulegium collected from 38 populations scattered all over Greece are presented in this paper.
Abstract: The essential oil content and the C-3 oxygenated p-menthane compounds of Mentha pulegium collected from 38 populations scattered all over Greece are presented. The oil content ranged from 1.0–3.8 mL/100 g (d.w.) and the C-3 oxygenated p-menthane compounds constitute in all populations the bulk of the oil (78.6–99.7% of the total oil). The quantitative composition of the different oils varied greatly with most variable compounds being pulegone (ranging from < 0.1–90.7% of the total oil), piperitone (not detected-97.2%), menthone (0.2–53.4%), isomenthone (0.1—45.1%), piperitenone (< 0.1–39.8%) and isopiperitenone (not detected-23.5%). Discriminant analysis revealed that the oil variation forms a cline along Greece. In southern Greece, where the real Mediterranean climate dominates, the total oil content and the amounts of the more reduced products of the C-3 p-menthane biosynthetic pathway, menthone and/or isomenthone and their derivatives, were increased.
TL;DR: The volatile chemical composition and oil production of both full flowering and fruiting plants allowed to assess the type and quality of the spike lavender oils processed in the studied area.
Abstract: The composition of six essential oil samples, obtained by steam distillation of twigs of spike lavender (Lavandula latifolia Med.) harvested in three different locations from southern Spain during the full flowering and fruiting phenological stages, has been analyzed by capillary GC and GC/MS in combination with retention indices. Yields of the oils during flowering (1.5–2.2%) were 2.5–7 times higher than during fruiting (0.3–0.6%). Among the 56 identified constituents (accounting for 96.0–97.5% of the oils), the main and characteristic components were linalool (27.2–43.1%), 1,8-cineole (28.0–34.9%), camphor (10.8–23.2%), borneol (0.9–3.6%), β-pinene (0.8–2.6%), (E)-α-bisabolene (0.5–2.3%), β-pinene (0.6–1.9%), β-caryophyllene (0.5–1.9%), α-terpineol (0.8–1.6%), sabinene (0.3–0.8%), myrcene (0.3–0.8%), camphene (0.4–0.6%), terpinen-4-ol (0.3–0.5%) and limonene (0.2–0.9%). The volatile chemical composition and oil production of both full flowering and fruiting plants allowed to assess the type and...
TL;DR: In this paper, Artemisia vulgaris essential oils produced from a population of Vietnamese origin cultivated near Hanoi were subjected to analysis by GC, GC/MS and 13C-NMR.
Abstract: Essential oils produced from a population of Artemisia vulgaris of Vietnamese origin cultivated near Hanoi were subjected to analysis by GC, GC/MS and 13C-NMR. The oils were found to contain oxygenated monoterpenes as major components (1,8-cineole, camphor and α-terpineol). The composition of these oils differed from that previously reported for Vietnamese A. vulgaris oil. Only slight differences in the composition of the oil were observed along the vegetative life of the plant. No significant difference was observed between compositions of leaf and flower oils. In addition, the combination of retention indices, GC/MS and 13C-NMR spectroscopy allowed the identification of unusual sesquiterpenes such as presilphiperfolan-9α-ol as a minor component.
TL;DR: The leaf oils of Curcuma caesia Roxb and two cultivars of C. longa L. were investigated by GC as mentioned in this paper, who found that the leaf oils can be characterized by the following major constituents: terpinolene, myrcene, and camphor.
Abstract: The leaf oils of Curcuma caesia Roxb. and two cultivars of C. longa L. were investigated by GC. The leaf oils can be characterized by the following major constituents C. longa ‘Roma’: terpinolene (87.8%); C. longa ‘Kasturi’: myrcene (48.8%) and terpinolene (10.1%); C. caesia: 1,8-cineole (27%) and camphor (16.8%).
TL;DR: The leaf oils of seven species from the family Annonaceae, growing in Queensland, Australia, have been examined in this article, and the principal components were caryophyllene oxide (26%), spathulenol (11%), and benzyl benzoate (4%).
Abstract: The leaf oils of seven species from the family Annonaceae, growing in Queensland, Australia, have been examined. Artabotrys sp. (Claudie River B.Gray 3240) produced oil in poor yield in which unidentified oxygenated sesquiterpenes accounted for approximately 80% of the oil. Uvaria rufa gave an oil rich in sesquiterpenes, in which the principal component was a-humulene (50%), while in Uvaria concava the principal component was spathulenol (32%). Benzyl benzoate was also present (5%) in U. rufa. In Cyathostemma micranthum the principal components were caryophyllene oxide (26%), spathulenol (11%) and benzyl benzoate (4%). The oil of Mitrephora zippeliana existed in two forms in which either monoterpenes were more prominent with a-pinene (13%) and β-pinene (15%) being the major components together with the sesquiterpenes caryophyllene oxide (10%), spathulenol (10%) and β-caryophyllene (8%), or sesquiterpenes were prominent with β-caryophyllene (18%), α-humulene (7%), γ-curcumene (4%), bicyclogermacre...
TL;DR: The chemical composition of the essential oil obtained from the rhizomes of Zingiber officinale Roscoe from Cuba was examined by combined GC and GC/MS.
Abstract: The chemical composition of the essential oil obtained from the rhizomes of Zingiber officinale Roscoe from Cuba was examined by combined GC and GC/MS. The oil was characterized by the presence of ar-curcumene (22.1%), zingiberene (11.7%), β-bisabolene (11.2%) and cadina-1,4-diene (12.5%).
TL;DR: The chemical composition of Atlas cedarwood oil produced by two distillation modes and seven sample origins was determined in this paper, where the major constituents in the essential oil were α-himachalene (7.4-16.4%), γ-hmachalenes (5.1-8.6%), β-himchalene(23.4−40.4%) and (E)-α-atlantone (52−29.5%).
Abstract: The yield and the chemical composition of Atlas cedarwood oil produced by two distillation modes and seven sample origins were determined. Steam distillation and hydrodistillation gave approximately the same yield (2.5–2.6 mL/100g). The samples from Adrej, Tounfite, Tamjilt and Ajdir gave the highest oil yields. The major constituents in the essential oil were α-himachalene (7.4–16.4%), γ-himachalene (5.1–8.6%), β-himachalene (23.4–40.4%) and (E)-α-atlantone (5.2–29.5%).
TL;DR: The oils of the inflorescences and leaves of Tanacetum vulgare collected at full flowering in 10 habitats in Vilnius district were investigated and found to contain higher amounts of the first major component and oxygenated monoterpenes than the leaf oils.
Abstract: The essential oils of the inflorescences and leaves of Tanacetum vulgare L. var. vulgare collected at full flowering in 10 habitats in Vilnius district were investigated. Forty-one constituents were identified. The oils were distributed among four chemotypes. The major constituents of the camphor chemotype (10 samples) were camphor (22.3–41.4%) and 1,8-cineole (10.6–26.4%); the α-thujone chemotype (six samples) was found to be dominated by α-thujone (25.7–71.5%) and 1,8-cineole (11.3–22.3%); the major constituents of the 1,8-cineole-chemotype (three samples) was dominated by 1,8-cineole (24.5–32.7%) and camphor (8.3–23.8%); the artemisia ketone chemotype (one sample of inflorescences) predominantly featured artemisia ketone (30.5%) and camphor (23.0%). The oil from inflorescences of the above chemotypes contained higher amounts of the first major component and oxygenated monoterpenes (mean 83.6%) than the leaf oils (mean 73.7%). An opposite correlation was noticed for mono- and sesquiterpenes hyd...
TL;DR: The chemical composition of the essential oils obtained from the leaves of Piper peltata (L.) Miq. and P. aduncum L. from Cuba were examined by combined GC/MS as mentioned in this paper.
Abstract: The chemical composition of the essential oils obtained from the leaves of Piper peltata (L.) Miq. and P. aduncum L. from Cuba were examined by combined GC/MS. The oil obtained from P. peltatum was characterized by the presence of caryophyllene oxide (22.9%), spathulenol (9.0%), trans-calamenene (5.4%) and α-copaene (5.2%) as major constituents, while that of P. aduncum contained dillapiole (82.2%) as the major component.