Results 221 to 230 of about 7,977,034 (276)
Some of the next articles are maybe not open access.
Natural Product Research, 2019
This study was focused on in vitro screening of the total antioxidant activity of the selected extracts of the mushroom Coprinus comatus and quinic acid, one of their antidiabetic ingredients, by an uncommon electrochemical assay. Indeed, direct current (
M. Karaman +6 more
semanticscholar +1 more source
This study was focused on in vitro screening of the total antioxidant activity of the selected extracts of the mushroom Coprinus comatus and quinic acid, one of their antidiabetic ingredients, by an uncommon electrochemical assay. Indeed, direct current (
M. Karaman +6 more
semanticscholar +1 more source
Synthesis of anellated carbasugars from (−)-quinic acid
Carbohydrate Research, 2003(3R,4R,5R)-3-[(tert-Butyl-dimethylsilyl)oxy]-4,5-(isopropylidenedioxy)-1-cyclohexanone (2) reacted with carbon disulfide and methyl iodide in the presence of sodium hydride to furnish (3R,4R,5R)-5-[(tert-butyl-dimethylsilyl)oxy]-3,4-(isopropylidenedioxy)-2-[bis(methylthio)methylene]-1-cyclohexanone (3).
Lidcay, Herrera +4 more
openaire +2 more sources
Quinic acid esters from Erycibe obtusifolia with antioxidant and tyrosinase inhibitory activities
Natural Product Research, 2019A new quinic acid derivative, 3-O-syringoylquinic acid methyl ester (1), along with eight known quinic acid derivatives (2-9), three coumarins (10-12), one phenylpropanoid (13), three feruloyltyramine derivatives (14-16), one lignan (17) and two ...
J. Choi +7 more
semanticscholar +1 more source
Synthesis of Polyhydroxycyclohexanes and Relatives from (−)-Quinic Acid
The Journal of Organic Chemistry, 2003An efficient and versatile strategy for the synthesis of polyhydroxycyclohexanes and related compounds 3-6 is reported. The successful synthesis of these analogues has been achieved from a common intermediate, quinic acid derived lactone 2, rapidly accessible from cheap and commercially available (-)-quinic acid (1) as a chiral template.
Concepción, González +2 more
openaire +2 more sources
Quinic and shikimic acids in fruits
Qualitas Plantarum et Materiae Vegetabiles, 1958There are relatively large amounts of quinic acid in young apples and small amounts of shikimic acid in senescent apples. The possible significance of these acids in the biosynthesis of the aromatic ring is discussed. The widespread occurrence of varying amounts of these acids in edible fruits (pears, gooseberries, blackberries, strawberries, cherries,
openaire +1 more source
Rapid Communications in Mass Spectrometry, 2010
Abstract All four regioisomers of feruloyl quinic acid and isoferuloyl quinic acid were synthesized and a liquid chromatography/tandem mass spectrometry (LC/MS/MS) method developed that resolves all eight regioisomers. All eight regioisomers can be readily distinguished by their MS/MS spectra in the negative ion mode, illustrating the
Nikolai, Kuhnert +4 more
openaire +2 more sources
Abstract All four regioisomers of feruloyl quinic acid and isoferuloyl quinic acid were synthesized and a liquid chromatography/tandem mass spectrometry (LC/MS/MS) method developed that resolves all eight regioisomers. All eight regioisomers can be readily distinguished by their MS/MS spectra in the negative ion mode, illustrating the
Nikolai, Kuhnert +4 more
openaire +2 more sources
Thermodynamics of interaction of caffeic acid and quinic acid with multisubunit proteins
International Journal of Biological Macromolecules, 2000Helianthinin is a multisubunit protein from Sunflower seeds. Caffeic acid (CA) and quinic acid (QA) are intrinsic ligands present in sunflower seeds. The mechanism of interaction of these ligands with multisubunit proteins is limited. The present study enables one to understand the mechanism of the interaction of these ligands with the protein ...
P, Suryaprakash, R P, Kumar, V, Prakash
openaire +2 more sources
(−)-Quinic acid: configurational (stereochemical) descriptors
Tetrahedron: Asymmetry, 1997Abstract The configurational descriptors at C(1) and C(4) of (−)-quinic acid are given incorrectly in at least four reference compendia. The stereogenic centers C(1) and C(4) as a pair are reflection invariant and are thus not chiral centers. The correct name, according to the 1982 amendment to the CIP system, is (1 s n ,3 R ,4 s n ,5 R ...
Ernest L. Eliel, Mara Bello Ramirez
openaire +1 more source
Terbium(III) complexes of (−)-quinic acid
Journal of the Less Common Metals, 1983Abstract Complexation between terbium(III) and (−)-quinic acid (quin) (1,2,3,5-tetrahydroxycyclohexanecarboxylic acid) was studied by means of circularly polarized luminescence spectroscopy. [Tb]:[quin] ratios of 1:1, 1:2, 1:3, 1:5 and 1:10 were studied, and measurements of intermolecular energy transfer were used to determine pH regions in which the
Harry G. Brittain +3 more
openaire +1 more source
Occurrence of shikimic and quinic acids in angiosperms
Phytochemistry, 1975Abstract Leaves of 83 angiosperms have been made surveyed for quinic and shikimic acids. The quinic acid content was higher in woody dicotyledons than in herbaceous dicotyledons or in the monocotyledons, substantiating the view that its presence may be correlated with the lignification in plants.
Seiichi Yoshida +2 more
openaire +1 more source