TAILIEUCHUNG - Báo cáo " Flavonoid glucosides from the leaves of Croton tonkinensis Gagnep., Euphorbiaceae "

Faculty of Chemistry, College of Natural Science, Vietnam National University Anticancer Agent Research Laboratory, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea Summary Two flavone C-glucosides vitexin (1) and isovitexin (2) were isolated as the major constituents with the total content of of the methanol extract of the Croton tonkinensis leaves along with an minor acylated flavonol O-glucoside kaempferol 3-O- D-(6’’-O-coumaroyl)glucopyranoside (tiliroside, 3) () | Journal of Chemistry Vol. 42 1 P. 125 -128 2004 FLAVONOID GLUCOSIDES FROM THE LEAVES OF CROTON TONKINENSIS GAGNEP. EUPHORBIACEAE Received 14-7-2003 PHAN MINH GIANG1 JUNG JQQN LEE2 PHAN TONG SON1 Faculty of Chemistry College of Natural Science Vietnam National University 2Anticancer Agent Research Laboratory Korea Research Institute of Bioscience and Biotechnology Daejeon Korea SUMMARY Two flavone C-glucosides vitexin 1 and isovitexin 2 were isolated as the major constituents with the total content of of the methanol extract of the Croton tonkinensis leaves along with an minor acylated flavonol O-glucoside kaempferol 3-O-ft-D- 6 -O-coumaroyl glucopyr anoside tiliroside 3 . The structures of 1 2 and 3 were determined on the basis of ESIMS 1D and 2D NMR spectroscopic data. Although the flavonoid glucosides found exclusively in the ethyl acetate and n-butanol soluble fractions are reported for antioxidative and antiinflammatory activities their contribution to the medicinal properties of C. tonkinensis is demonstrated to be less than the lipid soluble ent- kaurene diterpenoid constituents of this plant In our past studies on the medicinal plant Croton tonkinensis Gagnep. Euphorbiaceae 1 the phytosterols the long chain alkyl alcohols and the ent-kaurene-type diterpenoids 2 were isolated from the non-polar parts n-hexane and CH2Cl2 soluble fractions of the methanol extract of the dried leaves of C. tonkinensis 3 . The investigation of the methanol extract by reserved-phase high performance liquid chromatography RP HPLC coupled with a photodiode array PDA detector 4 revealed the presence of two major classes of components ent-kaurene diterpenoids and flavonoid gluco-sides. Of the flavonoids two were quantified as the major total and one as the minor constituents of the methanol extract which were found to be localized in the polar ethyl acetate and n-butanol soluble fractions. When the ethyl acetate soluble fraction was dissolved in a minimum amount of .

• Báo cáo khoa học
• carbonate method
• electrochemical polarization
• triggered matter content
• chemical research
• chemical engineering
• chemistry of life
• Vietnam Journal of Science and Technology
• Bài viết khoa học
• Tạp chí Khoa học Công nghệ Việt Nam
• Tạp chí Khoa học Việt Nam
• Co precipitation method
• Glycerol carbonate
• Problem solving
• Teaching chemistry
• real life
• Chemistry teaching
• Chemistry curriculum emphasizes practicality
• Technological processes
• Didactics in Higher Education
• Conception pupil orientation
• Learning processes of master students
• Teacher training in Chemistry Education
• Natural Product Chemistry
• Chemistry
• chemistry in modern life
• Electronegativity
• chemical bonding
• Stereochemistry
• Physical chemistry
• The life sciences
• The first law
• Phase equilibria
• Chemical equilibrium
• Thermodynamics of ion
• The rates of reactions
• Microscopic systems
• The chemical bond
• Macromolecules and self assembly
• Optical spectroscopy
• Magnetic resonance
• The conception of pupil orientation
• Possible changes
• Lecture Biology
• Systems biology
• Biological sciences
• Biological organization
• Biologists investigate life
• Studying life
• Biological Significance
• Ecological Role
• Aklaloid Chemistry
• environmental change
• human evolution
• Textbook of biochemistry
• Chemical basis of life
• General metabolism
• Clinical and applied biochemistry
• Applied biochemistry
• Chemistry of lipids
• Chemistry of carbohydrates
• Overview of metabolism
• Biochemistry Concepts
• Biochemistry Connections
• Language of Chemistry
• Chemical Foundation of Life
• The energetics of life
• Nucleic acids
• Introduction to Proteins
• Journal of Chemistry
• Phase change material
• End of life tires
• Thermal energy storage
• Composite material
• Differential scanning calorimetry
• Cultivation of S platensis algae from CO2
• CO2 greenhouse gas
• Ion – Life Alkaline water
• Green chemistry
• Circular economy in chemical engineering
• Campbell biology
• Biology systems
• Molecular diversity of life
• Organic chemistry
• Scientific reports
• scientific research
• biochemistry
• The RNA world hypothesis assumes that life arose from ancestral RNA molecules
• which stored genetic information and catalyzed chemical reac tions
• Although RNA catalysis was believed to be restricted to phosphate chemistry
• it is now established that the RNA has much wider catalytic capacities
• Prokaryotes
• Eukaryotes
• Cell Evolution
• Cells in Action
• The Chemistry of Life
• Complex Cells
• Central Science
• Industrial Experience
• Return to Academia
• The Cleveland Years
• Moving to Los Angeles
• Good Enemies
• Shelf life
• Functional food
• Frozen meat
• Standard vitamin B1
• Dried shrimp
• Food chemistry