ABSTRACT
<p><b>OBJECTIVE</b>To study the chemical components of essential oils from Meconopsis oliverana and their antioxidant activity.</p><p><b>METHOD</b>The essential oil was extracted by steam distillation, and GC-MS analysis was used to identify its constituents. The OH free radical scavenging activity of the essential oils was evaluated with an enzyme mark instrument by assay of the ability of DPPH free radical scavenging. BHT was used as positive control.</p><p><b>RESULT</b>Forty-seven compounds, account for 91.866% of the essential oils, were identified. The ability of scavenging OH and DPPH radicals of the essential oils is stronger than that of BHT.</p><p><b>CONCLUSION</b>The main chemical constituents of the essential oils from M. oliverana are n-hexadecanoic acid (27.653%) and 6,10,14-trimethyl-2-pentadecanone (16.330%). And the essential oils showed strong antioxidant activity.</p>
Subject(s)
Antioxidants , Chemistry , Metabolism , Biphenyl Compounds , Metabolism , Butylated Hydroxytoluene , Metabolism , China , Fatty Alcohols , Chemistry , Free Radical Scavengers , Chemistry , Metabolism , Gas Chromatography-Mass Spectrometry , Hydroxyl Radical , Metabolism , Oils, Volatile , Chemistry , Oxidation-Reduction , Palmitic Acid , Chemistry , Papaveraceae , Chemistry , Picrates , Metabolism , Plant Oils , ChemistryABSTRACT
In the basis of a large amount of literatures, this article sumed up the characteristics and application of eggshell membrane.
ABSTRACT
<p><b>OBJECTIVE</b>To provide the foundation for reasonable utilization by analysing the essential oils from Serissa serissoides in different seasons.</p><p><b>METHOD</b>Essential oils were obtained by steam distillation. The chemical components were separated and identified by gas chromatography-mass spectrometer (GC-MS). The relative content of each component was determined by area normalization.</p><p><b>RESULT</b>Forty-three peaks were identified from autumn material, representing 78.91% of the total oil. Main constituents of the essential oil from the autumn material were found to be 1b,5,5,6a-tetramethyl-octahydro-1-oxa-cyclopropa [a] inden-6-one (7.32%); methyl linolenate (4.14%); cubenol (5.97%); 2-methoxy-4-vinylphenol (10.87%); delta-9(10)-tetrahydrocostunolide-1-keto (35.51%). Seventy-two peaks were identified from spring material, representing 79.88% of the total oil. Main constituents of the essential oil from the spring material were found to be caryophyllene (3.315%); ethylbenzene (3.523%); 3-hexen-1-ol (4.537%); 2-methoxy-4-vinylphenol (6.513%); 5-propionyl-2-chlorobenzeneacetic acid, methyl ester (8.541%), germacrene D (12.311%).</p><p><b>CONCLUSION</b>The same compounds in both materials are as follows: 2,2-dimethyl-6-methylene-cyclohexanepropanol; 2-methoxy-4-vinylphenol; 3,7-dimethyl-1,6-octadien-3-ol; cubenol; docosane and eicosane. It seems that they are the diagnostic components in these medicinal materials. Essential substances are different in quantity and quality in different seasons.</p>