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

Limnophyla rugosa is an erect-semi aquatic, fragrant, annual herb, up to 50 cm tall. Stem simple or branch, glabrous to hirsute, rooting from the lower nodes, leaves decussate, ovate-lanceolate to oval elliptical 2-8cmx1-5 cm, flowers solitary in axillary; sometimes in axillary pendunculate clusters with up to 7 sessile. Limnophyla rogusa occurs in moist along treams,pools and rice field from sea-level up to 1500 m attitude. Yield of essential oil from aerial parts of Limnophyla rogusa was 0.18 percent by air-dry material, 23 constituents of the essential oil were identified by GC/MS. Major constituent of essential oil was anethol (89.4%)
Oils, Volatile ; oils ; Chemistry ; Plants ; Medicine, Traditional

Chemical components of essential oil of rhizoma (Alpinia pinnanensis T. L. Wu & Senjen) were analysed by capillary GC and GC/MS methods. Antimicrobiological activities were tested. Results showed principal components of essential oil are sesquitecpenoid and their derivatives (nearly 70%). The antibacteria spectrums of essential oil were broad, especially it has strong activities for negative gram bacteria, E. coli and S. aureus
Oils, Volatile ; Chemistry ; Oils ; Medicine, Traditional

Chemical components of essential oil of Piper nigrum L. and essential oil of Piper betle L. were identified by GC/MS method. The main constituents in essential oil of Piper nigrum L. are D-limonene, alpha-pinene, beta-pinene and D3-carene. The main components of essential oil of Piper betle L. are eugenyl acetate or isoeugenyl acetate, alylpyrocatechol diacetate, eugenol or isoeugenol, caryophylen
Oils, Volatile ; Chemistry ; Oils ; Medicine, Traditional

This paper presented a study on the dynamic of essential oil accumulation in Japanese mint SK33 (M. arrvensis L.) and the influence of storage time on its quantity and quality. This mint was cultivated at Co Nhue experimental station, Tu Liem district, Ha Noi City between 2000 and 2002. The results showed that during the vegetation and development process, the essential oil content in the plant gradually increased and achieved maximum at first branch flowering stage and reduced to minimum at the end of flowering stage. The menthol content in essential oil of Japanese mint SK33 reached the highest value at full flowering stage (81.79%). The best harvest time for this mint is from the beginning flowering stage to full flowering period. After harvesting the whole plants can be stored during 20 days without the change in content and quality of essential oil
oils ; Conservation of Natural Resources ; Oils, Volatile

Materials and methods: Wild growing Adenosma caeruleum R.Br. (Scrophulariaceae) was collected at Dak Mil district (Dak Lak province) in July 2002 for oil preparation. The oil analysis was carried out by a combination of capillary gas chromatography and mass spectrometry. Results: The essential oil was obtained from the aerial part of the plant at the yield of 0.5% compared with dried materials. 38 chemical compounds were identified. The major components were thymol (24.67%), alpha-humulene (16.44%), thymyl methylether (12.59%), gamma-terpinene (12.26%), beta-caryophyllene (5.82%), beta-bisabolene (5.67%), p-cymene (4.58%), humulene oxide (3.59%) and caryophyllene oxide (2.76%).
Scrophulariaceae ; Oils ; Oils, Volatile ; Plants ; Medicine, Traditional

No abstract available.
Dermatitis, Contact* ; Oils*

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

Schefflera aff. crassibracteata is a shrub 6 high, leaflets 6-12. It is distributed in HoaBinh, NinhBinh, PhuKhanh provinces. The oil yield from leaves was 0.24% by air-dry material. The essential oil was analysed by HRGC and GC/MS, 61 constituents have been identified. Major components were: caryophyllen oxide (12.1%); -pinene (8.9%); -pinen (4.8%) and T-muurolol (4.7%).
Chemistry ; Oils, Volatile