The essential oils of eight samples of Piper aduncum L., collected at dierent localities of the Amazon region, were analysed by GC±MS. The major component identi®ed in all samples was dillapiole (31.5± 97.3%). Sample A, collected at Serra do Navio (AP), showed a yield of oil and dillapiole content of 3.3% and 31.5%, respectively; sample B, collected at MelgacË o (PA), 1.8% and 50.8%; sample C, collected at Ben®ca (PA), 1.6% and 56.3%; samples D and E, collected at Bele m (PA), 1.2% and 82.2%; 1.5% and 86.9%, respectively; sample F, collected at Manaus (AM), 3.4% and 91.1%; sample G, collected at Road Manaus-Caracaraõ , km 30 (AM), 3.0% and 97.3%; sample H, collected at Cruzeiro do Sul (AC), 3.2% and 88.1%. The yield of oil and dillapiole content of samples of P. aduncum occurring in Malaysia and Fiji showed 1.3% and 64.5%; and 0.5% and 58.0%, respectively. By comparison, the plants growing wild in Amazonas State had the highest oil yield and dillapiole content. #

The essential oils of the leaves and fine stems of Psidium acutangulum, P. striatulum, P. guineense and P. guajava were obtained by hydrodistillation and analysed by GC-MS. The main compounds identified in the oil of P. acutangulum were α-pinene (14.8%), 1,8-cineole (12.9%) and β-pinene (10.1%). The oil of P. striatulum was dominated by β-caryophyllene (28.6%), α-selinene (7.7%), caryophyllene oxide (7.6%) and β-selinene (7.4%). The major constituents found in the oil of P. guineense were β-bisabolol (17.4%), limonene (6.8%) and epi-α-bisabolol (6.7%). The oil of P. guajava was dominated by α-pinene (23.9%), 1,8-cineole (21.4%) and β-bisabolol (9.2%).

No abstract

The oils of three samples of the leaves and fine stems of Myrcia bracteata, M. cuprea and M. sylvatica were obtained by hydrodistillation and analysed by GC-MS. The main compounds found in the oils of M. bracteata were (E)-nerolidol (80.8%) for the sample B-1; (E)-β-farnesene (33.9%) for the sample B-2; and spathulenol (31.0%) for the sample B-3. The oils of M. cuprea were dominated by myrcene (48.1%) and β-caryophyllene (19.9%) in the sample C-1; by β-caryophyllene (39.1%), myrcene (19.2%) and α-pinene (15.9%) in the sample C-2; and by β-caryophyllene (38.1%), germacrene D (21.8%) and germacrene B (19.5%) in the sample C-3. The major constituents identified in the oils of M. sylvatica were selin-11-en-4-α-ol (24.7%), caryophyllene oxide (16.6%) and spathulenol (13.8%) in the sample S-1; by cis-calamenene (30.1%) and spathulenol (18.7%) in the sample S-2; and by spathulenol (40.2%) and β-bisabolene (14.7%) in the sample S-3.

No abstract

This paper contains data on the chemical composition of the essential oils of 22 leaf samples of Piper marginatum Jacq. collected in different areas and ecosystems of the brazilian Amazon, as well as an overview of the available literature. The species presents a large synonymy based on their different leaf characteristics and distinct scents where some of them smell like anise or very close compounds. By GC, GC/MS, and cluster analysis, we identified seven chemotypes for the leaf oils. The main components found in chemotype I were safrole (1) and 3,4-(methylenedioxy)propiophenone (2). The chemotype II was dominated by 3,4-(methylenedioxy)propiophenone (2) and p-mentha-1(7),8-diene (10). The major compounds identified in chemotype III were 3,4-(methylenedioxy)propiophenone (2), myristicin (3), (E)-beta-ocimene (11), and gamma-terpinene (12). In the chemotype IV, the principal constituents were beta-caryophyllene (13), alpha-copaene (14), and 3,4-(methylenedioxy)propiophenone (2). The chemotype V was dominated by (E)-isoosmorhizole (6), (E)-anethole (8), and isoosmorhizole (7). The main compounds found in the chemotype VI were 2-methoxy-4,5-(methylenedioxy)propiophenone (4), methoxy-4,5-(methylenedioxy)propiophenone isomer 5, and (E)-isoosmorhizole (6). The major constituents in chemotype VII were beta-caryophyllene (13), bicyclogermacrene (15), and (E)-asarone (9).

The essential oils of Peperomia pellucida and Peperomia circinnata var. circinnata were investigated by GC–MS. The main components identified in the oil of P. pellucida were dillapiole (39.7%) and trans‐caryophyllene (10.7%). The most constituents found in the oil of P. circinnata var. circinnata were limonene (13.5%), elemicin (11.5%), cubebol (9.7%) and myrcene (8.3%). Copyright © 1999 John Wiley & Sons, Ltd.

No abstract