In order to get better knowledge about the volatiles produced by Xanthocyparis vietnamensis, a species recently discovered in Vietnam, its wood oil has been analyzed combination of chromatographic (GC, CC) and spectroscopic (GC-MS, (13)C-NMR) techniques. Forty components that accounted for 87.9% composition have identified. The is dominated nootkatene (20.7%), 11,12,13-tri-nor-eremophil-1(10)-en-7-one (17.2%), γ-eudesmol (5.1%), nootkatone (4.7%), valencene (3.5%)...

Abstract Essential oils produced from a population of Artemisia vulgaris Vietnamese origin cultivated near Hanoi were subjected to analysis by GC, GC/MS and 13C-NMR. The found contain oxygenated monoterpenes as major components (1,8-cineole, camphor α-terpineol). composition these differed that previously reported for A. oil. Only slight differences in the oil observed along vegetative life plant. No significant difference was between compositions leaf flower oils. In addition, combination...

Abstract The chemical composition of the volatile oil extracted from aerial parts (twigs, leaves and flowers) Michelia foveolata growing wild in Vietnam was investigated by combination column chromatography, GC (retention indices), GC–MS 13 C‐NMR spectroscopy. Fifty‐eight components were identified, with sabinene (32.4%) terpinen‐4‐ol (13.7%) as main constituents. essential tested against 11 bacteria using agar disc diffusion method, exhibited a significant antibacterial activity Salmonella...

Keteleeria davidiana (C.E.Bertrand) Beissn. is a species of conifer native to southern China, Laos and Vietnam. The has been listed as vulnerable in Essential oil samples have isolated from leaves, twigs wood, their compositions investigated for the first time by combination chromatographic spectroscopic techniques [GC-FID, GC-MS and13C NMR]. composition leaf essential was dominated α-pinene (28.1%), β-pinene (15.8%) (E)-β-caryophyllene (13.8%). Twig contained mainly (37.9%) (24.7%)...

The leaf essential oil compositions of four Cinnamomum species from Vietnam were analyzed by gas chromatography (GC) and GC–mass spectrometry (GC–MS). main compounds sericans Hance the sesquiterpenes spathulenol (14.5%), caryophyllene oxide (9.3%), β-caryophyllene (7.1%) bicyclocgermacrene (6.0%). monoterpenes represented α-pinene (9.3%) sabinene (8.0%). However, dominant class in durifolium Kosterm comprising mainly ρ-cymene (15.6%), limonene (13.9%) α-phellandrene (9.2%). Spathulenol...

Nine secondary metabolites, including a new cycloartane glucoside, rhizostyloside (1), were isolated from methanol extract of Rhizophora stylosa leaves through several chromatographic experiments. The structures the compounds determined on basis NMR spectroscopic (1H and 13C NMR, HSQC, HMBC, 1H-1H COSY, NOESY) HR-ESI-MS data by comparison with literature values. Compound 1 exhibited significant cytotoxicity against three human cancer cell lines: KB (epidermoid carcinoma), LU-1 (lung...

The chemical composition and the antimicrobial activity of essential oil isolated from aerial parts Acronychia pedunculata (L.) Miq. Vietnam are reported. Analysis was carried out by GC (RI), GC–MS 13C NMR. Thirty-four compounds were identified, accounting for 92.8% oil. major constituents α-pinene (57.4%) (E)-β-caryophyllene (13.6%). A. shown to possess a broad spectrum against various bacteria, particularly Salmonella enterica Staphylococcus epidermidis.

Three species, Bulbophyllum layae, B. metallica and papilligerum (all from sect. Cirrhopetalum) are described as new for science. All of these novelties local endemics limestone areas northern Vietnam. Additionally, three alcicorne (sect. Brachystachya), psittacoglossum yunnanense (both Sestochilus) recorded the flora Vietnam first time. These species have wide distribution in mainland Asia. Data on ecology, phenology, distribution, brief relevant taxonomic notes, well color photographs,...

In the present investigation, essential oil compositions of four individual plants from Scrophulariaceae family cultivated in Vietnam were reported. The air-dried hydrodistilled (Vietnamese Pharmacopoeia) and oils analyzed by gas chromatography-flame ionization detector (GC-FID) chromatography-mass spectrometry (GC-MS) techniques. content varied between 0.15% 0.40% (v/w) on a dry weight basis. Monoterpenes (74.0%–85.1) represent main class compound oils. Adenosma bracteosa Bon., afforded...

Abstract The essential oil of Pogostemon cablin (Blanco) Benth. grown in Vietnam, was analyzed by capillary gas chromatography and mass spectrometry. Patchouli alcohol accounted for about 32–38% the patchouli oil. Ten more compounds were identified, which α-bulnesene α-guaiene main components.

The chemical composition of the essential oils obtained from hydrodistillation different parts Etlingera yunnanensis (T.L. Wu & S.J. Chen) R.M. Sm. and Hornstedtia sanhan M.F. Newman (Zingiberaceae) grown in Vietnam are reported. analysis was performed by means a gas chromatography-flame ionization detector (GC-FID) chromatography coupled with mass spectrometry (GC-MS). oil leaves E. comprised mainly germacrene D (19.2%), β-pinene (11.6%), α-amorphene (11.2%), while that stems rich (23.7%),...

Keteleeria evelyniana Mast. is a species of conifer native to southern China, Laos and Vietnam. The has been listed as vulnerable in Oil samples have isolated from leaves, twigs, roots cones, analyzed by combination GC(FID), GC-MS 13C NMR. composition leaf oil, dominated α-pinene (37.8%) β-pinene (17.9%), varied substantially that previously reported. Twig, cone root oil compositions are reported for the first time. Twig contained mainly (E)-β-caryophyllene (25.4%) accompanied (15.9%),...

Cupressus tonkinensis was treated for a long time as synonym of torulosa D. Don. and it proposed new species in 1994. The two differed by morphological characters they were distinct their random amplified polymorphic DNAs (RAPDs). Leaves stems C. produce monoterpene-rich oils whose composition is investigated here the first combination chromatographic spectroscopic techniques. α-Pinene (23.1%), sabinene (21.0%) terpinen-4-ol (14.4%) major components leaf oil that contained also β-elemol...

an (Zingiberaceae) growing in Vietnam was performed by means of gas chromatography-flame ionization detector (GC-FID) and chromatography-mass spectrometry (GC-MS) techniques. The yields essential oils were 0.22%, 0.16% 0.30% (v/w) respectively for leaf, stem root, calculated on a dry weight basis. main constituents the leaf oil δ-elemene (17.0%), β-pinene (12.8%) β-elemene (8.8%). comprised mainly (20.1%), germacrene D (8.6%) bicyclogermacrene (8.1%). root had abundance (21.0%), bornyl...

Glyptostrobus pensilis (Staunton ex D. Don) K. Koch is a critically endangered species, native to southeastern China and also very locally found in Dak Lak Province, Vietnam. Essential oil isolated from leaves monoterpene-rich containing mainly limonene (33.3%), α-pinene (23.4%) bornyl acetate (9.2%). The composition of G. wood rather complex the identification individual components needed fractionation over column chromatography. main components, identified by GC(RI), GC-MS 13C NMR, were...

The gummy stem blight caused by Didymella bryoniae (Auersw.) is a major and destructive disease of watermelon in Vietnam. Bacillus species have been used to control plant diseases as biological agents. This study was carried out at the Department Crop Production Plant Protection, Phu Yen province, Vietnam during 2020 – 2021 determine fungal inhibition D. DB-03 vitro suppression under greenhouse conditions sp. strains namely S1A1, S1F3, S13E3, S18F11, S20D12, which were isolated from...

A new 3-methoxybenzensulfonic acid 4- O-β-D-glucopyranoside (1), and ten known compounds (2–11) were isolated from the methanolic extract of stems Mallotus microcarpus. The cytotoxicity was evaluated by MTT method. 3-Methoxybenzensulfonic (1) methyl salicylate 2-rutinoside (5) showed strong against EGFR-TKI-resistant human lung cancer A549 cells in comparison with camptothecin. Compound 1, leonuriside (2), 3,4'-dihydroxypropiophenone 3- O-glucoside (6) (1 R,2 S)-hovetrichoside (10) inhibited...

Abstract The chemical composition of the essential oil Piper bavinum was investigated, using a combination GC (RI), GC/MS and 13C-NMR. main constituents were bicyclogermacrene (10.6%), globulol (5.7%), ledene (5.1%), α-pinene (4.4%), viridiforol (3.5%), terpinen-4-ol (3.2%) α-gurjunene (3.0%). Key Word Index: Piperaceaeessential compositionbicyclogermacreneglobulolledene

The leaf and twig essential oils of Magnolia hypolampra, growing wild in Na Hang Nature Reserve, Tuyen Quang province Vietnam, were obtained by hydrodistillation analyzed gas chromatography-mass spectrometry. oil yield calculated on a dry weight basis from leaves M. hypolampra was very high (1.62%, v/w), while that twigs much lower (0.07%, v/w). dominated monoterpenoids (74.3% 84.8%) sesquiterpenoids (24.4% 13.3%) with β-pinene (36.5% 41.3%), α-pinene (23.7% 24.4%), germacrene D (14.6% 5.8%)...

The essential oil isolated from Asarum cordifolium C. E. Fischer recently discovered in Vietnam, and A. glabrum Merr., an endangered species listed as vulnerable the Red Data Book of have been analyzed by a combination chromatographic spectroscopic techniques including 13 C NMR spectroscopy. composition oil, investigated for first time, was dominated elemicin (82.5%). contained safrole (41.9%) its major component characterized diversity phenylpropanoids this (10 compounds).

In this study, we evaluate the ecological impact of effluent cooling water from Ninh Thuan nuclear power plant II, using a two-dimensional hydraulic model to simulate thermal diffusion outfall. Sites selected for study were and Vinh Hai seawater in four different scenarios. This paper utilized relationship between surface temperature at depth -15 m calculate intake outlet -14 m. A combination results interpolated showed that affected largest incidence about 2450 North, 880 South 960 West. It...

Abstract From the leaves of Magnolia insignis , six compounds including (+)‐afzelechin (1) budlein B (2) pinoresinol monomethyl ether‐β‐D‐glucoside (3) nicotiflorin (4) kaempferol‐3‐O‐β‐D‐xylopyranose (5) astragalin (6) were isolated. The structures these elucidated by MS and NMR spectra comparison with reported data. This is first time that all above have been isolated from .