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Objective: To analyze and compare the compounds of the essential oil from the fruits and leaves and roots of Litsea cubeba., Methods: With steam distillation extraction method, Litsea cubeba essential oil was extracted from the fruits and leaves and roots. The qualitative and quantitative analysis of Litsea cubeba essential oil were carried out with GC-MS., Results: 18 compounds were identified from the fruits (93.57% of the total essential oil) and 17 compounds were identified from the roots (98.01% of the total essential oil) and 28 compounds were identified from the leaves (95.33% of the total essential oil). The main constituents of the fruits essential oil were Citral, Limonene, and so on; The main constituents of the roots essential oil were Citral, 6-Octenal, 3,7-dimethyl-, 2-Octen-1-ol, 3,7-dimethyl-, and so on; The main constituents of the leaves essential oil were Citral, Eucalyptol, Citronellol, 6-Octenal, 3,7-dimethyl-, and so on., Conclusion: The constituents of volatile oil extracted from the different parts of Litsea cubeba were different, so they should be utilized differently in clinical application and study in great depth.

Objective: To study the effects and its mechanisms of total flavonoids of Litsea coreana (TFLC) on insulin resistance (IR) in rats with hyperlipidemia., Methods: The rats were fed with high fat emulsion to make IR models. The effects of TFLC on the state of impaired glucose tolerance (IGT), fasting serum glucose (FSG), fasting serum insulin (FINS), fasting serum lipids (TC, TG, LDL-C, HDL-C), free fatty acid (FFA) and Leptin were observed,and the index of insulin sensitivity (ISI) was calculated., Results: TFLC could significantly improve the state of IGT and depress the level of FSG, FINS, TC, TG, LDL-C, FFA and leptin of model rats, which could also increase the content of HDL-C and ISI significantly and enhance the sensitivity of insulin., Conclusion: TFLC has obvious effects on increasing insulin sensitivity and improving the insulin resistance in rats with hyperlipidemia,which may contribute to the regulating effects on the disturbance of lipid metabolism and the decrease of leptin level.

Objective: To study the chemical constituents of Litsea lancifolia., Methods: AU compounds were isolated from the diethyl ether extract of the title herb by sillica gel column chromatogrphy, and their structures were identified by physical and chemical evidences and spectral methods., Results: Seven compounds were isolated and identified as (-)-aristortetralone (1), dehydrodiisoeugenol ( 2), dihydrodehydrodiconifery alcohol ( 3) , 5,7-dimethoxy-3', 4'-methylenedioxyflavan-3-ol (4), p-hydroxy-benzoic acid (5), vanillin(6), p-sitosterol (7), respectively., Conclusion: All compounds are isolated from this plant for the first time.

In this paper, the antioxidation of three flavoniods from the leaves of Litsea coreana was tested by tissue homogenate MDA. The results showed that these compounds had the obvious effect of antioxidations with dose-effect relationship. And the activity is kaempferol > querctin-3-O-beta-D-glucopyranoside > kaempferol-3-O-beta-D-glucopyranoside. Another, by comparison of the inhibitory rate of tissue homogenate MDA of heart, brain, liver and kidney, it was found that their effect is kidney > heart > liver > brain. This paper may provide some important scientific informations for the development and utilization of natural antioxidants--three flavoniods from the leaves of Litsea coreana.

In this paper, 37 constituents in the essential oil from roots of Litsea rotundifolia var. oblongifolia were identified by means of GC-MS-DS. The content of these compounds are 86.37% in the essential oil of this plant, terpenoids is the main compound.

The 24 chemical constituents of the essential oil extracted from the leaves of Litsea cubeba have been identified by means of GC-MS technique. Among which, alpha-cis-ocimene(25.11%), 3,7-dimethyl-1,6-octadien-3-ol(16.85%) and n-transnerolidol (13.89%) were the principal components. In vitro this oil had a manifest antifungal activities with MIC between 0.03-0.4 microliter/ml for utilized pathogenic fungi and 1.0-2.0 microliters/ml for moulds.

Two crystalline substances are isolated from aerial parts of Litsea glutinosea (Lour.) C. B. Rob. and are identified as a-phenylcinnamic acid and p-cumarric acid.