Milton Helio L. da Silva

Constituents of the essential oil of Piper aduncum L. growing wild in the Amazon region

The essential oils of eight samples of Piper aduncum L., collected at different localities of the Amazon region, were analysed by GC–MS. The major component identified 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 Melgaco (PA), 1.8% and 50.8%; sample C, collected at Benfica (PA), 1.6% and 56.3%; samples D and E, collected at Belem (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-Caracarai, 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.

Essential oils of Lippia alba (Mill.) N. E. Br growing wild in the Brazilian Amazon

The essential oils of aerial parts of specimens of Lippia alba (Mill.) N. E. Br were analysed by GC–MS. The plants were collected at three municipalities of Para State, Brazil, and their oils shown to be quite different. The samples of essential oils may be divided into three groups. The first, type A (collected at Santa Maria), is characterized by 1,8-cineole (34.9%), limonene (18.4%), carvone (8.6%) and sabinene (8.2%). The second, type B (collected at Belterra), is dominated by limonene (32.1%), carvone (31.8%) and myrcene (11.0%). The third, type C (collected at Chaves), is represented by neral (13.7%), geranial (22.5%), germacrene-D (25.4%) and β-caryophyllene (10.2%).

The essential oils of Lantana camara L. occurring in North Brazil

The essential oils of aerial parts of three samples of Lantana camara L. collected at different places in the Amazon Region were obtained by hydrodistillation and analysed by GC–MS. The main constituents found in the oil of leaves and thin branches of a specimen collect in the State of Amapa (sample A) were limonene (16.5%), α-phellandrene (16.4%), germacrene-D (13.2%), β-caryophyllene (10.8%) and sabinene (8.9%). The major components identified in the oil of leaves and thin branches of a specimen collected in the State of Roraima (sample B) were germacrene-D (28.4%), germacrene-B (9.1%) and β-caryophyllene (5.6%). The specimen collected in the State of Para (sample C) furnished oils from leaves plus thin branches and flowers, separately. Both were dominated by γ-curcumene+ar-curcumene (27.6%; 31.9%), α-zingiberene (19.2%; 15.5%) and α-humulene (10.7%; 9.5%), respectively. Copyright

Variability in essential-oil composition of Piper marginatum sensu lato.

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)‐β‐ocimene (11), and γ‐terpinene (12). In the chemotype IV, the principal constituents were β‐caryophyllene (13), α‐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 β‐caryophyllene (13), bicyclogermacrene (15), and (E)‐asarone (9).

Essential oils composition of Eupatorium species growing wild in the Amazon

The essential oils of six Eupatorium species were obtained by hydrodistillation and analysed by GC-MS. The oil of E. macrophyllum was rich in sabinene (46.7%) and limonene (23.3%). The oil of E. laevigatum was mainly constituted by a mixture of aristolone+laevigatin (23.6%), globulol (16.2%) and germacrene D (8.6%). The principal constituents of the oils of the chemotypes A and B of E. squalidum, E. amygdalinum and E. conyzoides were caryophyllene oxide (17.4–30.1%), globulol (25.1%), germacrene D (10.4–21.6%), spathulenol (14.2%) and β-caryophyllene (7.1–12.3%). The oils of the chemotypes A and B of E. marginatum were dominated by α-zingiberene (57.5%), α-gurjunene (19.5%), germacrene D (14.8%), (E)-8-bisabolene (9.7%) and α-selinene (9.0%).

The essential oils of Peperomia pellucida kunth and P. circinnata link var. circinnata

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

Essential Oil Variation in Lippia glandulosa Schauer

Abstract The oils of 14 samples of Lippia glandulosa collected in the “Lavrado” area, Roraima state, North Brazil, were obtained by hydrodistillation and analyzed by GC and GC/MS. Two chemical groups were characterized in the oils, one which was rich in thymol (46.3–78.1%), and another containing β-caryophyllene (17.3–59.4%) as the major component. In the first group the compounds p-cymene (5.1–7.2%) and β-caryophyllene (4.1–9.2%) have been associated to thymol in six of the analyzed oil samples. On the other hand, the second group showed variable association with (E)-nerolidol (0.7–23.6%), trans-α-bergamotene (0.2–19.3%), α-alaskene (3.4–16.0%), α-pinene (1.2–7.8%), α-hu-mulene (2.6–6.0%), caryophyllene oxide (1.9–6.0%) and linalool (0.9–5.0%), in the other eight oil samples, justifying the field observation concerning the plant scent variability at the same collection site and the chemical composition differentiation observed to L. glandulosa.

Essential Oils of Siparuna guianensis Aubl.

Abstract The essential oils of three types of Siparuna guianensis collected at different places of the Amazon were analyzed by GC/MS. The main constituents found in the oil of the sample collected at Moju (PA) were epi-α-bisabolol (25.1%) and spathulenol (15.7%). The oil of the sample collected at Rio Branco (AC) was dominated by spathulenol (22.0%), selin-11-en-4α-ol (19.4%), β-eudesmol (10.0%) and elemol (10.0%). The major components found in the oil of the sample collected at Belem (PA) were germacrone (23.2%), germacrene D (10.9%), bicycliogermacrene (8.6%), germacrene B (8.0%) and atractylone (31.4%).

Contribuição à flora medicinal de Mato Grosso do Sul

Preliminary research on the folk medicine of Mato Grosso do Sul State is presented here. Botanical identification, according Cronquists sistematic classification, of plant families, traditional uses of plants and additional data are provided. A large number of families are represented in the popular pharmacopeia of this region of western central Brazil.

Composition of the Essential Oils of Conyza bonariensis (L.) Cronquist

Abstract The essential oils of Conyza bonariensis, collected from five different places in the Amazon region were obtained by hydrodistillation and analyzed by GC/MS. The major components found in the oils from state of Mato Grosso were (E)-β-farnesene (19.1–23.3%), germacrene D (13.2–15.3%), β-caryophyllene (13.0–14.4%) and limonene (6.9–12.6%). The oils from the state of Para were rich in (E)- β-farnesene (20.1–30.9%), β-caryophyllene (13.3%) and limonene (3.7–22.9%). The oil from the state of Amapá was rich in limonene (58.4%).