Do N. Dai

Chemical composition of essential oils from the leaves and stem barks of Vietnamese species of Polyalthia harmandiiPolyalthia jucunda and Polyalthia thorelii

This article reports the chemical components identified in the essential oil from the leaf and stem barks of Polyalthia harmandii (Pierre) Fin. and Gagnep., Polyalthia jucunda (Pierre) Fin. and Gagnep. and Polyalthia thorelii (Pierre) Fin. and Gagnep. The compounds identified in all the samples were α-pinene (0.2–3.2%), myrcene (0.3–4.1%), (E)-β-ocimene (0.2–9.6%), bicycloelemene (0.2–18.0%), β-elemene (0.3–4.9%), β-caryophyllene (0.1–17.8%), germacrene D (4.4–20.1%), bicyclogermacrene (4.2–27.9%) and δ-cadinene (0.2–4.5%). Besides, benzyl benzoate (9.7%) and ishwarane (8.0%), respectively, were the other prominent compounds in the leaf and stem of P. harmandii. In addition, δ-3-carene (8.2%), α-amorphene (6.5%), β-phellandrene (5.5%) and β-pinene (5.1%) were identified in P. jucunda leaf, while sabinene (30.9%) and β-phellandrene (10.2%) occurred largely in the stem. Moreover, γ-elemene (22.3% and 12.3%), germacrene D (10.5% and 6.9%) and spathulenol (9.1% and 11.8%) were identified in the leaf and stem of P. thorelii, while α-terpinene (7.8%) and β-gurjunene (5.2%) were identified only in the leaf oil.

Chemical constituents of essential oils from the leaves and stem barks of four Vietnamese species of Fissistigma (Annonaceae)

Chemical profiles of essential oils from four Fissistigma species: Fissistigma bracteolatum Chatt., Fissistigma villosissimum Merr., Fissistigma latifolium (Dunal) Merr. and Fissistigma glaucescens (Hance) Merr. were analysed by gas chromatography–flame ionisation detector and gas chromatography–mass spectrometry. Fissistigma essential oils consist mainly of sesquiterpenes (48.7–83.8%), monoterpenes (3.2–30.9%) and fatty acids (0.5–33.4%). Data on the essential oil composition of F. villosissimum, F. latifolium and F. glaucescens are reported for the first time.

Constituents of Essential Oils from the Leaves and Stem Barks of Uvaria rufa and Uvaria cordata (Annonaceae) from Vietnam

Abstract: Uvaria is a genus of flowering plants in the family, Annonaceae. The present study aimed to determine the chemical composition of essential oils hydrodistilled from the leaves and stem barks of Uvaria rufa Blume and Uvaria cordata (Dun.) Wall. ex Alston., grown in Vietnam. The oils were analysed by means of Gas chromatography-flame ionisation detector (GC-FID) and Gas chromatography-coupled with Mass spectrometry (GC-MS). We have found both quantitative and qualitative differences between the two samples. The main constituents of the leaf oil of U. rufa were δ-3-carene (12.8 %), n-hexadecanoic acid (9.1 %), β- caryophyllene (5.9 %), (Z)-β-ocimene (5.7 %) and γ-terpinene (5.4 %), while the stem oil was dominated by germacrene D (38.4 %), benzyl benzoate (18.1 %) and n-eicosane (5.5 %). In U. cordata oils, the major compounds were n-heneicosane (10.3 %), aristolone (9.8 %), bicycloelemene (6.5 %) and 2,4-bis(1,1- dimethylethl)-phenol (6.2 %) in the leaf; as well as n-eicosane (14.8 %), n-heneicosane (9.3 %), 2,6-di-t-butyl- 4-methylene-2,5-cyclohexadiene-1-one (6.7 %) and β-caryophyllene (6.6 %) in the stem.

Chemical Composition of Essential Oils of Artabotrys petelotii Merr.,Artabotrys intermedius Hassk., and Artabotrys harmandii Finet & Gagnep. (Annonaceae) from Vietnam

Abstract: The chemical composition of essential oils of Artabotry spetelotii Merr., Artabotrys intermedius Hassk., and Artabotry sharmandii Finet & Gagnep. (Annonaceae) collected from Vietnam and determined by GC-FID and GC-MS, are being reported. The main compounds of the leaf of A. petelotti were elemol (19.4 %), cis-β-guaiene (9.2 %), δ-cadinene (8.4 %) and δ-elemene (5.5 %), while the stem bark comprised mainly of elemol (32.7 %), δ-cadinene (11.9 %) and spathulenol (9.6 %) as compounds of significant quantities. On the other hand, δ-3-carene (19.1 %), α-gurjunene (10.7 %) and α-zingiberene (6.3 %) were the major constituents of the leaf oil of A. intermedius. The stem was rich in δ-3-carene (29.9 %), germacrene D (15.1 %) and α-amorphene (8.0 %). A. harmanddii yielded oil in which the major components were spathulenol (17.4 %), aromadendrene epoxide (12.2 %), γ-elemene (7.1 %) and isospathulenol (5.6 %). The compositional patterns of these oil samples are being reported for the first time.

Analysis of the Essential Oils from Five Vietnamese Litsea Species (Lauraceae)

Abstract In this paper, the compositional pattern of essential oils from five plants in the genus Litsea (Lauraceae family) cultivated in Vietnam, were being reported. The air-dried plant materials were hydrodistilled and the oils were analysed by Gas chromatography-flame ionization detector (GC-FID) and Gas chromatography coupled with Mass spectrometry (GC-MS). The leaf oil of Litsea helferi Hook.f., was rich in limonene (17.5 %), β-caryophyllene (14.2 %), bicyclogermacrene (13.1 %), bicycloelemene (12.4 %) and α-phellandrene (8.0 %). The main constituents of Litsea ferruginea Liou., leaf oil were dominated by monoterpenes comprising of sabinene (34.5 %), α-pinene (10.1 %), γ-terpinene (7.8 %), limonene (6.9 %) and terpinen-4-ol (6.6 %). The quantitative significant constituents of the leaf oil of Litsea verticillata Hance were also monoterpene compounds represented by linalool (23.4 %), α-pinene (26.1%) and β-pinene (11.7 %). In addition, the monoterpene hydrocarbons (E)-β-ocimene (57.4 %), along with α-pinene (7.8 %) and β-pinene (7.3 %) were the main constituents in the leaf oil of Litsea glutinosa (Lour.) C. B. Rob. The main compounds in the leaf, stem, fruits and roots oils of Litsea cubeba (Lours.) Pers., were (Z)-citral (32.9-66.1 %), sabinene (1.4-14.2 %), limonene (7.0-13.6 %) and linalool (1.9-9.5 %). The chemical compositions of L. helferi, L. ferruginea and L. verticillata are being reported for the first time.

CHEMICAL CONSTITUENTS OF ESSENTIAL OIL BEARING PLANTS FROM VIETNAM

An Agilent Technologies HP 6890N Plus chromatograph was fitted with a fused silica capillary HP-5 MS column and interfaced with a mass spectrometer HP 5973 MSD (70 eV) for GC/MS analysis, under the same conditions as above. Compound identification was performed by comparison of retention indices (RI) and MS data with literature data [13, 14]. Table 1 present the compounds identified in the studied oil samples from Vietnam. The major constituents of G. multiovulatus were sesquiterpenes represented by -humulene (18.4%), germacrene D (14.4%), bicycloelemene (10.4%), and bicyclogermarene (10.2%). The oil of X. vielana consists mainly of -elemene (19.5%), germacrene D (12.7%), bicyclogermacrene (10.7%), and spathulenol (9.6%). E. lepta fruit afforded oil in which the main compounds were -caryophyllene (20.9%), limonene (15.9%), and germacrene D (12.5%). There are significant amounts of -pinene (6.6%), -elemene (6.3%), -humulene (6.1%), and bicyclogermacrene (5.5%). Contrary to a previous report on the stem [11], the content of -cadinene in the studied fruit oil was low. In addition, octadecyl ester, hexadecanoic acid, and neophytadiene were also absent in the present oil sample of E. lepta.

Terpene constituents of the leaves of five Vietnamese species of Clausena (Rutaceae)

This article reports the compounds identified in the leaf oils of five Clauseana species growing in Vietnam. The hydrodistilled oils were analysed for their chemical constituents by using gas chromatography–flame ionisation detector and gas chromatography coupled with mass spectrometry. The major compounds identified in Clausena dentata (Willd.) M. Roem. were α-pinene (21.7%), sabinene (18.3%) and β-myrcene (14.3%). Clausena dimidiata Tanaka comprised mainly of safrole (56.9%) and α-terpinolene (22.1%). However, 1-menthone (70.6%) and β-phellandrene (13.0%) were the most abundant compounds of Clausena indica (Dalz.) Oliver. Sesquiterpene compounds represented mainly by β-caryophyllene (16.7%), spathulenol (11.9%) and bicyclogermacrene (7.5%) were the major constituents of Clausena excavata Burm. f., while those of Clausena engleri Tanaka include bicycloelemene (12.1%), bicyclogermacrene (11.0%) and (E)-nerolidol (6.6%). This is the first report on the chemical analysis of essential oils of C. dimidiata and C. engleri.

Constituents of essential oils from the leaves, stem barks and resins of Canarium parvum Leen., and Canarium tramdenanum Dai et Yakovl. (Burseracea) grown in Vietnam

The chemical constituents of essential oils from the leaf, stem bark and resins of Canarium parvum Leen., and Canarium tramdenanum Dai et Yakovl. (Burseracea) grown in Vietnam are being reported. The hydrodistilled oils were analysed for their chemical constituents by means of gas chromatography-flame ionisation detector and gas chromatography coupled with mass spectrometry. The main compounds of C. parvum were β-caryophyllene (18.7%), (E)-β-ocimene (12.9%), (Z)-β-ocimene (11.9%), germacrene D (8.8%) and α-humulene (8.4%) in the leaf; β-caryophyllene (30.4%), α-copaene (20.5%) and (E)-β-ocimene (7.7%) in the stem. However, germacrene D (23.2%), α-amorphene (14.9%), α-copaene (9.8%) and β-elemene (8.6%) were present in the resin. The leaf of C. tramdenanum comprises β-caryophyllene (16.8%), α-phellandrene (15.9%), γ-elemene (13.1%) and limonene (11.8%), while limonene (25.7%), α-phellandrene (21.7%), α-pinene (12.3%) and β-caryophyllene (10.9%) were present in the stem. However, δ-elemene (14.6%) and bulnesol (16.0%) are the main constituents in the resin.

Chemical Compositions of Essential Oils of Selected Medicinal Plants from Thùa Thiên-Huế Province, Vietnam

Essential oils from selected plants of Vietnam were analyzed by gas chromatography (GC-FID) and gas chromatography/mass spectrometry (GC-MS). The results showed that one group contains aromatic and terpenoid components namely Friesodielsia filipes (stem: benzyl benzoate, α-pinene); Meiogyne virgata (stem; α-humulene, benzyl benzoate, bicyclogermacrene); and P. sessiliflora (stem: eugenol, limonene, α-phellandrene), while the second group producing terpenoid oils includes F. filipes (leaf: α-pinene, β-caryophyllene, caryophyllene oxide); M. virgata (leaf: α-humulene, bicyclogermacrene, β-caryophyllene, bicycloelemene); Polyalthia sessiliflora (leaf: limonene, β-caryophyllene, β-cubebene); Pseuduvaria indochinensis (leaf: α-copaene, α-pinene; stem: limonene, α-phellandrene, β-caryophyllene); and O. hirsuta (leaf: cis-ρ-mentha-2,4(8)-diene, germacrene D, bicyclogermacrene).

Essential oil compositions of Alphonsea philastreana (Pierre) Pierre ex Finet & Gagnep. and Alphonsea gaudichaudiana (Baill.) Finet & Gagnep. from Vietnam.

Essential oils isolated from the air-dried leaves of Alphonsea philastreana and Alphonsea gaudichaudiana growing in Vietnam have been studied for their constituents by means of gas chromatography with flame ionization detector and gas chromatography coupled with mass spectrometry. Sesquiterpenes were the most prominent class of compound identified in the oils. The quantitatively significant constituents of the oils were (E)-β-ocimene (6.9% and 8.5%), bicycloelemene (8.9% and 6.3%), β-caryophyllene (5.1% and 5.9%), α-humulene (5.8% and 4.6%), bicyclogermacrene (9.3% and 6.3%), guaiol (9.0% and 5.2%) and α-eudesmol (8.3% and 5.5%), respectively, for A. philastreana and A. gaudichaudiana. This is the first comprehensive report on the volatile oil constituents of the studied species.