Arturo Velasco-Negueruela

Volatile Constitutents of Four Lippia Species from Córdoba (Argentina)

ABSTRACT The volatile oils from four species of genus Lippia of the Verbenaceae family, Lippia turbinata, L. polystachya, L. junelliana and L. integrifolia have been examined by means of GC/MS and IR in combination with retention indices. The main constituents of the essential oil of L. turbinata were found to be α-thujone (28.29%), carvone (7.40%), β-caryophyllene (5.39%), germacrene-D (5.16%), bicyclogermacrene (4.53%), spathulenol (6.06%) and caryophyllene oxide (7.03%). The volatile oil of L. polystachya was found to contain α-thujone (68.94%) and carvone (10.34%) as major components. The oil from L. junelliana was characterized by the presence of large amounts of myrcenone (15.48%), myrcene (7.92%), limonene (9%), camphor (10.55%), (E)-tagetenone (6.30%), trans-dihydrocarvone (5.85%) and cis-dihydrocarvone (16.65%). The main components of the volatile oil of L. integrifolia were shown to be camphor (16.20%), africanene isomers (5.04%), lippifoli-l(6)-en-5-one (16.70%) and an unidentified component (1...

Seasonal variation in chemical constituents of Santolina rosmarinifolia L. ssp. rosmarinifolia.

The seasonal variation of the essential oil extracts from the aerial parts of a Santolina rosmarinifolia population has been studied. Oil yields increased in the months of March, April, May and June. Oil concentration showed significant correlations with both precipitation (positive) and temperature (negative). Essential oil main components were sabinene, beta-pinene, myrcene, beta-phellandrene, limonene, 1,8-cineole, artemisia ketone, terpinen-4-ol, capillene, ar-curcumene and beta-eudesmol. Monoterpenes like beta-phellandrene, limonene and 1,8-cineole showed a significant negative correlation with temperature, while capillene presented a strong positive correlation with precipitation. The rest of the essential oil components did not show any noticeable trend.

Variations in the essential oil composition of Artemisia pedemontana gathered in Spain: chemotype camphor-1,8-cineole and chemotype davanone

The essential oil composition of two Spanish populations of Artemisia pedemontana Balbis. has been studied by GC and GC–MS. Variations on the chemical composition of both samples depending on the place of collection have been detected. The main constituents of the oil from A. pedemontana gathered in Canon de Rio Lobos (Ap.Rl) were found to be camphor (49.2%) and 1,8-cineole (12.6%), whereas the oil from this species collected in Mirador de la Galiana (Ap.Mg) showed davanone (28.4%) as major compound. According to our results we suggest the presence of two chemotypes of A. pedemontana camphor+1,8-cineole and davanone

Volatile Constituents of Two Salvia Species Grown Wild in Spain

Abstract The volatile oils from two species of genus Salvia L., of the Lamiaceae family, Salvia aethiopis L. and S. sclarea L. have been examined by means of GC/MS in combination with retention indices. The main constituents of the essential oil of S. aethiopis were found to be: α-copaene (10.43-9–15%), germacrene D (10.46–4.95%) and bicyclogermacrene (41.48–29.54%). The volatile oil of S. sclarea was found to contain linalool (32.97%), α-terpineol (5.63%), linalyl acetate (16.85%) and germacrene D (7–57%) as major components.

Chemical Composition of Fennel Oil, Foeniculum vulgare Miller, from Spain

Abstract The chemical composition of the volatile oils of seeds of Foeniculum vulgare Miller from two Spanish locations (Santander and Aranjuez) were investigated by means of GC and GC/MS. Leaf and stem oils of F.vulgare from Aranjuez were also examined. Two different chemotypes have been found in the seeds: (I) methyl chavicol (54.9%), fenchone (24.6%) in the seeds collected in Santander; and (II) (E)-anethole (54.9–38.1%), fenchone (22.2–34.4%) in the seeds gathered in Aranjuez. The oil from the leaves collected in Aranjuez (April, June) was found to contain methyl chavicol (12.3–12.1%), α-phellandrene (9.4–27.2%), limonene (25.3–18%) and fenchone (19.4–18.3%) as major constituents. The oil from the stems gathered in Aranjuez (September) was characterized by a high content of (E)-anethole (17.4–3–3%), α-pinene (9.7–14.4%), α-phellandrene (24.3–31.4%), p-cymene (11.5–5–2%), limonene (11.6–15%) and fenchone (9–1–17–5%).

Essential oil variability of Minthostachys verticillata

Abstract The leaf volatile constituents of Minthostachys verticillata from various phytogeographic areas of Argentina were steam distilled and analyzed by GC and GC/MS. The composition of the oil was extremely variable from one population to another, leading to the conclusion that there are several chemotypes in this species. Thymol and carvacrol, which were absent in the oils of another populations previously reported, were the major components (> 10.0%) in the oils of Potrero and Sebastian populations (Catamarca). Pulegone was found in oils from Cordoba, San Luis, Catamarca (Balcosna population) and Tucuman (Potrero de las Tablas population) in high amounts (> 21.1%). A high percentage of carvone (35.2%) was found in the oil obtained from Rancho de la Cascade plants.

Analysis by gas chromatography–mass spectrometry of the volatile components of Ageratina adenophora Spreng., growing in the Canary Islands

The essential oil of Ageratina adenophora Spreng., growing in the Canary Islands was analyzed by GC-MS. A total of 78 volatile compounds was identified and p-cymene (11.6%) was the major component in the oil. The sesquiterpene fraction (44.3%) was higher than the monoterpene one (32.1%).

Composition of the Volatile Oil from the Aerial Parts of Inula viscosa (L.) Aiton

The volatiles isolated from the leaves and flowers of Inula viscosa (L.) Ait. were studied by means of GC and GC-MS. The oil obtained by hydrodistillation was shown to contain borneol (25.2%), bornyl acetate (19.5%) and isobornyl acetate (22.5%) as major constituents, whereas that isolated first by hexane extraction followed by hydrodistillation contained borneol (20.8%), bornyl acetate (48.7%) as main components and a small amount of isobornyl acetate (0.3%).

Volatile Oil of Hyssopus officinalis L. from Spain

ABSTRACT The essential oil from Hyssopus officinalis grown in Spain was examined by GC and GC/MS. The oil was characterized by a high content of 1,8-cineole (52.89%) and β-pinene (16.82%) as the main components.

Composition of the Essential Oils of Ocimum basilicum var. glabratum and Rosmarinus officinalis from Turkey

ABSTRACT Water-distilled volatiles of Ocimum basilicum var. glabratum and Rosmarinus officinalis gathered in Turkey were analyzed by means of GC, GC/MS, 1H-NMR and 13C-NMR. O. basilicum oil was found to contain linalool (43.73%) and (E)-methyl cinnamate (27.28%) as the major constituents whereas 1,8-cineole (36.91%), borneol (17.50%) and p-cymene (10.50%) were shown to dominate R. officinalis oil.