The chemical composition of essential oil of Zanthoxylum nitidum DC. from Thanh Hoa has been studied by combination of capilary GC and and found to contain 50 components, 40 of which have been identified. The major ones being beta-caryophyllene (24.6%), y- elemene (14.7%), bicyclogermacrene (12.9%). From the leaves of Zanthoxylum nitidum DC. were isolated stigmasterol and dihydrokaempferit. Its structure were elucidated by EI-MS, 1H-NMR, 13C-NMR
Plants, medicinal ; Pharmaceutical Preparations

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

Studying on Clausena lansium (Lour.) samples collected from Pu Mat, Nghe An province in March 2004 to isolate and determine structure of some sterol compounds. Bough samples were dried and pounded leached with methanol in 20 days. Methanol extract was collected via distilling process to get solvents. Extracting with ethyl acetate, n-butanol and then distilling to get solvent we collected corresponding sediments. The corresponding solid extracts were collected by extract method with ethyl acetate, n-butanol solvents and then segment distill. A1, A2 solids were isolated by chromatographic method and segment crystallization. Using EI - MS, 1H - NMR, 13C - NMR spectroscopic methods to determine structure, A1 were identified as beta - sitosterol and A2 as stigmasterol. This is the first time these compounds isolated from Clausena lansium (Lour.) in Vietnam
Clausena ; Plants, medicinal

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