Results 131 to 140 of about 3,303 (174)
Some of the next articles are maybe not open access.
A blue chemiluminescence in the reaction of umbelliferone with hypochlorite
Journal of Bioluminescence and Chemiluminescence, 1995AbstractA strongly fluorescing 7‐hydroxycoumarin (umbelliferone, U) oxidized in dilute (10 μmol/L‐0, 1 mol/L) aqueous solution with CIO− or CIO− + H2O2 (but not with H2O2 alone) produces a strong chemiluminescence (CL). Light emission kinetics depends on the pH of solution (4.0–10.5) and the reaction has a low activation energy Ea = 31 ± 2 kJ/mol (285 ...
D, Slawinska, J, Slawinski
openaire +2 more sources
Effects of umbelliferone in a murine model of allergic airway inflammation [PDF]
European Journal of Pharmacology, 2009 The therapeutic effects of umbelliferone (30, 60 and 90 mg/kg), a coumarin isolated from Typha domingensis (Typhaceae) were investigated in a mouse model of bronchial asthma. BALB/c mice were immunized and challenged by nasal administration of ovalbumin.
Milena Soares +2 more
exaly +3 more sources
Antimicrobial properties of umbelliferone derivatives
Phytochemistry, 1971Abstract The inhibitory effects of umbelliferone and a number of its alkyl and acyl derivatives on the growth of a variety of bacteria, yeasts and molds have been examined. Herniarin and similar alkyl ethers are more effective antimicrobial agents than umbelliferone.
L. Jurd, A.D. King, K. Mihara
openaire +1 more source
Ultrafast branching in the excited state of coumarin and umbelliferone
Physical Chemistry Chemical Physics, 2013In the present work we have explored the ultrafast relaxation network of coumarin and umbelliferone (7-hydroxy-coumarin) using time-resolved femtosecond spectroscopy and quantum chemical calculations. Despite the importance of the photophysical properties of coumarin derivatives for applications in biomedicine, the low fluorescence quantum yield of ...
Caroline M, Krauter +4 more
openaire +2 more sources
Antioxidant role of Umbelliferone in STZ-diabetic rats
Life Sciences, 2006The objective of the study was to investigate the role of Umbelliferone (UMB) on lipid peroxidation, nonenzymic and enzymic antioxidants in the plasma and liver of streptozotocin (STZ)-induced diabetic rats. Adult male albino rats of Wistar strain, weighing 180-200 g, were induced diabetes by administration of STZ (40 mg/kg b.wt.) intraperitoneally ...
B, Ramesh, K V, Pugalendi
openaire +2 more sources
Structures of umbelliferone and 7-ethoxycoumarin
Acta Crystallographica Section C Crystal Structure Communications, 1985Umbelliferone (U), C9H60 3, Mr= 162.1, monoclinic, P21/c, a = 3 . 8 9 2 ( 1 ) , b = 11.022(2), c = 1 6 . 7 2 2 ( 3 ) A , /3= 90.58 (2) ° , V = 7 1 7 . 3 ( 3 ) A 3, Z =4, D m=1.50, D x= 1 . 5 0 M g m -3, ; I , (CuKa)= 1.5418/k, a = 1.114 mm -1, F(000) = 336, T = 298 K, R = 0 . 0 4 2 for 1255 observed reflexions. 7-Ethoxycoumarin (7-O-ethylumbelliferone;
openaire +1 more source
Influence of Umbelliferone on Glycoprotein Components in Diabetic Rats
Toxicology Mechanisms and Methods, 2007ABSTRACT Umbelliferone (7-hydroxycoumarin), a derivative of coumarin, is benzopyrone in nature, and it is present in the fruits of golden apple (Aegle marmelos Correa) and bitter orange (Citrus aurantium). The present study was designed with the objective of evaluating the effect of umbelliferone (UMB) on glycemic control and glycoprotein components in
B, Ramesh, K V, Pugalendi
openaire +2 more sources
Studies on glucoside intermediates in umbelliferone biosynthesis
Phytochemistry, 1965Abstract Two umbelliferone-producing glucosides have been found in Hydrangea macrophylla leaf extracts. By chromatographic characterization and comparison with the synthetic compounds, they have been identified as skimmin (7-β- d -glucosyloxycoumarin) and cis-2,4-di-β- d -glucosyloxycinnamic acid. Skimmin is by far the major component.
D.J. Austin, M.B. Meyers
openaire +1 more source
Ultrafast resonance energy transfer in the umbelliferone–alizarin bichromophore
Phys. Chem. Chem. Phys., 2014Fast and efficient intramolecular energy transfer takes place in the umbelliferone–alizarin bichromophore; the process is well described by the Förster mechanism.
Lapini Andrea +11 more
openaire +11 more sources
Investigation of Binding Properties of Umbelliferone (7Hydroxycoumarin) to Lysozyme
Journal of Fluorescence, 2012The binding interaction of lysozyme and umbelliferone (7hydroxcoumarin, 7HC) was investigated by UV-vis absorption and fluorescence quenching. It was obtained from fluorescence spectra that the fluorescence quenching of lysozyme by 7HC was probably a result of the formation of lysozyme-7HC complex and binding parameters were determined according to the
openaire +2 more sources