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The essential oils of Protium bahianum fruit and leaves obtained through water distillation were analyzed by GC-FID and GC/MS, and their acaricidal activity was also evaluated using Tetranychus urticae as model. Twentynine components were identified in the oils. The main component of the fruit oil was a-pinene (34.0%) whereas aromadendrene (20.3%) was the major component of the leaf oil. The leaf oil exhibited a higher lethality rate with LC50 of 3.5 mL/L of air after 24 h exposure. The fruits oil showed LC50 of 9.1 mL/L of air and was repellent at 1% concentration. [ABSTRACT FROM AUTHOR]

The essential oils of leaves and stems of Croton grewioides Baill. of the "agreste" region of Pernambuco, Brazil, were obtained by hydrodistillation and analyzed by GC and GC/MS. Twenty-two components were identified, which represented 99.8% and 98.6% of the total constituents in the leaf and stem oil, respectively. Croton grewioides produced an oil with a predominance of phenylpropanoid compounds, whose principal component was (E)-anethole (65.5% in the leaf and 47.8% in the stem). Other major components found in the leaf oil were methyl eugenol (10.6%) and (E)-methyl isoeugenol (4.7%). Other components identified in the stem oil were (E)-methyl isoeugenol (30.0%), cadalene (8.4%) and methyl eugenol (4.6%). The insecticidal activity of C. grewioides was evaluated against Mexican bean weevils, Zabrotes subfaciatus (Boheman) resulting in a LC50 for the leaf oil, which was 3.4 times less than that obtained from the stem oil. [ABSTRACT FROM AUTHOR]

The chemical compositions of the essential oils from the leaves collected of Lippia gracilis Schauer at two localities in the bioma caatinga of Pernambuco were analyzed by GC and GC/MS, where a total of thirty-six compounds were identified in the oils from all the samples. The chemical profiles of samples from the same locations were the same having only relative changes in composition. But the chemical compositions of oils collected in the vicinity of Buique in the Agreste of Pernambuco were quite different from the ones collected in Ouricuri in the Sertão. The main components identified in samples from Buique were carvacrol (36.4-45.0%) and p-cymene (18.1-26.2%), while thymol (37.4%), γ-terpinene (14.9-20.5%) and 4-methoxy-acetophenone (10.1-12.4%) were the major components found in the specimen collected in Buique. [ABSTRACT FROM AUTHOR]

Essential oils obtained by hydrodistillation from stem and leaves of Cordia globosa (Jacq.) Hmb., Bonpl. et Kunth and Cordia curassavica (Jacq.) Roem. et Schult. were analyzed by GC/FID and GC/MS. The oil yield of C. globosa and C. curassavica was 0.5% and 1.1% for the stem and 0.6% and 1.0% for the leaves, respectively. Although they belong to the same genus, the chemical composition of the oils from two Cordia species was very different. The main components in the oil of C. globosa were: 1-endo-bourbonanol (20.2% in stem) and linalyl butyrate (14.7% in stem);β-caryophyllene (39.0% in leaves) and α-humulene (12.1% in leaves). Spathulenol (27.1% in stem), trans-sesquisabinene hydrate (11.0% in stem), viridiflorol (10.7% in stem), β-phellandrene (25.3% in leaves), cubebol (23.9% in leaves) and α-pinene (10.4 % in leaves) were the main constituents of the oils of C. curassavica. [ABSTRACT FROM AUTHOR]

The essential oils from two sources of resinous exudates of Protium bahianum obtained by hydrodistillation were analyzed by combinations of GC and GC/MS. Twenty-two and thirteen components were identified in the oils from fresh and aged resins, comprising 95.8 % and 98.6 %, of the oils, respectively. The aged resin oil contained a high percentage of oxygen-containing sesquiterpenes (85.4 %) with a high predominance of β-(?)-santalol acetate (83.1 %). In contrast, no sesquiterpenes were detected in the fresh resin oil and it was constituted basically by monoterpenes hydrocarbons (42.4 %) and oxygen-containing monoterpenes (27.7 %), of which α-phellandrene (13.9 %) and terpinen-4-ol (7.4 %) were the major components, respectively. The acaricidal activities against Tetranychus urticae of the resin oil were also investigated. Both oils showed fumigant toxicity (mortality and fecundity), but only the aged resin oil induced repellence. [ABSTRACT FROM AUTHOR]

The essential oils of Lantana camara L. and L. fucata Lindl. leaves collected in the region of Mata Serrana in the municipality of Brejo da Madre de Deus in Pernambuco - Brazil were obtained by hydrodistillation and analyzed by GC and GC/MS. Twenty-five compounds were identified in L. camara, representing 99.4% of the leaf oil constituents, while 15 compounds were identified in L. fucata, representing 97.1% of the leaf oil constituents. The major compounds present in the oil of L. fucata were caryophyllene oxide (27.9%), gossonorol (18.2%), β-caryophyllene (12.3%) and bulnesol (10.8%), whereas those in the oil of L. camara were germacrene D (28.6%), germacrene D-4-ol (19.9%), β-caryophyllene (16.2%) and bicyclogermacrene (14.7%). [ABSTRACT FROM AUTHOR]

The essential oil of the leaves of six samples of Piper aduncum L. growing wild in two different region of Pernambuco, northeast of Brazil (Brejo da Madre de Deus -- samples BMD1 -- 3 and Serra Negra -- samples SN1 - 3), were investigated by a combinations of GC and GC/MS. The characterized oil samples from different localities show a high percentage of oxygen-containing sesquiterpenes in both places (BMD1 -- 3: 90.1-90.8% and SN1 - 3: 95.6-97.5%). Oxygen-containing monoterpenes represented less than 6% in BMD1 -- 3 and less than 1% in SN1 -- 3. Twelve compounds were identified representing more than 95% of each of the oil samples. (E)-Nerolidol was found to be the main component in all the samples being present in BMD1 -- three in the range of 81.5 to 82.5% while in SN1 - 3 79.2-81.2% were found. Despite the fact that some minor components are not present in each oil sample, this investigation showed the same compositions of the major components of the essential oils of these P. aduncum from different region of Pernanambuco. Longipinanol (BMD1 - 3: 2.4-5.6%; SN1 - 3: 11.1-13.6%) and epi-logipinanol (BMD1 - 3: 2.1-2.2%; SN1 - 3: 2.2-0.3%) are unusual components present in the samples, which could be identified for the first time in the P. aduncum species. [ABSTRACT FROM AUTHOR]