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

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

Mentha piperita L.Mentha piperita L. was collected from Sapa, Lao Cai province and cultivated at Co Nhue – Tu Liem – Ha Noi. The content of the essential oil in fresh branches of this peppermint was about 0.16%. Its green yield is 1.85-2.10 Kg/m2. First time in Vietnam, the chemical composition of peppermint oil was analyzed by GC/MS and 43 constituents were identified. The main constituents were L-menthol (47.60%), menthol (24.10%), menthofuran (6.07%) and 1.8 cineol (5.55%), pulegone (4.22%). Base on these data. The quality of Sa Pa peppermint oil is good as one from native origin. Peppermint collected from Sa Pa enrich the gene source of medicinal plant in general and particularly the gene source of essential oil plant group of Vietnam
Oils, Volatile ; Chemistry ; Plants

The method of converting isosafrol has the following good points: meeting all the production requirements, shortening the time of reaction, the waste of chemical substances if is reduced, meeting commercial standard, chemical substances are reusable. This method has a high feasibility.
Isosafrole ; Oils, Volatile ; surgery

For the first time, the chemical composition of the essential oil of Baeckea frutescens L. growing in Qu¶ng B×nh, Vietnam was investigated by means of GC, GC-MS, IR and 1H-NMR. 33 terpenoid components of the oil were identified. Monoterpennoids are the most abundant constituents of Baeckea oil. -Thujene (5.96%), -pinene (14.79%), -pinene (25.17%), p-cymene + limonene (11.09%), 1.8-cineol (10.12%), -terpinene (12.26%), linalool + terpinolene (5.12%) are the major components of the oil.
Oils, Volatile ; Chemistry