Desmos chinensis is a climber tree. Branches brown pubescent, leaves glaucous underneath, petals yellow. This tree distributes in many provinces of Viet Nam, mostly in Yen Bai, Ha Giang, Thai Nguyen, Bac Giang, Vinh Phuc, Quang Ninh, Hoa Binh, Ninh Binh, Quang Binh, Ha Tinh, Thua Thien Hue, Kontum, Dong Nai. The oil yield was 0.2% from air-dried flowers. The essential oil of Desmos chinensis was analysed using GS and RMN. 13 constituents have been identified, including beta-caryophyllene (28.9%), bicyclogermacren (11.5%), alpha-humullene (7.2%), D-germacren (7.2%), beta-elemene (6.4%)
chemistry ; Flowers ; Oils ; Oils, Volatile

Analysis on chemical contents of essential oil of Hybtis suaveolens (L) Poit collected in Ninh Thuan, Vung Tau and Phu Quocs showed that: 41 ingredients in essential oil of wild Hybtis suaveolens (L) Poit were identified by chromatography combining with mass spectrum. Hybtis suaveolens (L) Poit collected in others local but its compositions were rather similar. Major compositions was beta-caryophylen (30.35-44.27%) and 1,8-cineol (7.34-28.20%). In addition, some familiar monoterpens such as alpha - pinen, beta-pinen, sabinen, myrcen were in all three essential oils. Essential oil of Hyptis suaveolens (L.) Poit. had strong scent. With rather high content of sesquiterpen, essential oil of Hyptis suaveolens (L.) Poit. can be used as flavouring indicator in flavouring technology
Oils, Volatile ; yptis ; Epidemiology

Study on chemical coposition of essential oil from Zanthoxylum nitidum fruit collected at Me Linh district, Vinh Phuc province by GC/MS method. Results: the yield of essential oil from fruit was 0.35% by air-dry material, 27 constituents were identified, in which the main constituents were linalool L. (72.17%) and sabinen (11.24%)
chemistry ; Oils, Volatile ; Zanthoxylum

By a combination of gas-chromatography and gas-chromatography/mass spectrum, the chemical compositions of volatile oil of Co Lao (Eupatorium odoratum –L.) collected from Nghe An (NA) and Ha Tinh (HT) provinces were identified. Volatile oil contents from NA sample was 0,28%, HT 0,25%. The samples have got yellow color, lighter than water, characterized odor. Volatile oil is a mixture of 60 compounds,-39 in NA samples and 37 in HT. The main components of volatile oil are geijerene, germacrene-D and alpha pinene
chemistry ; Oils, Volatile ; Eupatorium

By gaz chronatography and gaz chronatography in combining with mass spectrum, the isolated essential oil of Man Tuoi Trang in Thach Thanh district of Thanh Hoa province was analysed. Results showed a content of 0,02% of volatile oil (in fresh sample) and its composition was determind. There were 67 compounds, among them 40 were nominated, with the main compositions were beta-caryophylen (21,2%), methylthymyl ether (13,7%), thymohydro quinonediethyl ether (10,2%)
Chemistry ; Oils, Volatile ; Eupatorium

With the method of water vapor distillation using the "modified apparatus for quantifying essential oil" of Ha Noi college of Pharmacy the essential oil was analysed by GC/MS. Results found essential oil in all organs of the plant such as root, stem, small branch and leaf, but the most was in leaf. The essential oil is a yellow liquid, heavier considerably than water. In the above- ground organs, there is almost 98,45%-99,03% of methyl salicylat. In the root, this content is lower, an addition with other components such as delta- tetradecalaction caryophylen oxid, nootkalon
Chemistry ; Oils, volatile ; Gaultheria

The determination of the contents and chemical components essential oil of Sen hoi (Zanthixylum rhetsa Roxl DC) collected in Mai Chau, Hoa Binh provine in Feb 2003 showed that the essential oil content reached 9,6% of dry product and 24 compouds was identified, among then the main compounds are benzen derivatives, 1- methoxy-4 (1- propenyl), benzaldehyd-4-methoxy, 1-butanon, 1- (4- hydroxy phemyl) and benzen-e,ethanol, alpha-ethyl-4-4 methoxy
Chemistry ; Oils, volatile ; Zanthoxylum

Study on chemical compositions of essential oil of Cyperus rotundus L. extracted from the stem and root of plant Cyperus rotundus L. from Nghe An in October 2003. Results: 49 components were detected by combination of GC and GC/MS, in which 18 had been identified. Monoterpens accounted for high level in essential oil. The main components were -cyperon (14.5%), cyperen (7.8%), caryophylen oxid (6.5%), -selinen (6.3%). Essential oil level was 0.2% for fresh samples. Essential oil had soil-yellow color and specific slight perfume
Oils, Volatile ; Chemistry ; Cyperus

Research by …..method combined with block spectrum. High content of Artemisia ketone is in essential oil of Bungaria, almost no have in essential oil of Viet Nam. In bloom period, essential oil content of Artemisia annual L in Viet Nam only attained 0,1-0,2%, meanwhile Bungari’s attained 0,5-0,8% (reckon follow fresh weight). That showed Artermisia annual essential oil of Viet Nam no has significant meaning in economic and reality.
Artemisia ; Chemistry ; Oils, Volatile

In Vietnam and Bulgaria, accumulation of essential oils of Artemisia annua L. depending on the period of it's growth, was investigated. The content change of compound is significant with 3 phases: Phase 1 - From tree began growth to first 6 months, phase 2 - from second month to fourth month, phase 3 - from fifth month to sixth month (the tree is in flower). Concentration of artemisia annua L. is highest at phase 3 when the tree is in flower
Oils, Volatile ; Artemisia ; plants