Results 211 to 220 of about 5,919,756 (285)
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Biochimica et Biophysica Acta, 1954
Abstract Quinic dehydrogenase, which catalyzes the conversion of quinic acid to 5-dehydroquinic acid, has been extracted from cells of an Aerobacter mutant and partially purified. The enzyme is DPN-specific. With initial extracts TPN also promotes the reactin, but its activity has been shown to be due to coupling with DPN by pyridine nucleotide ...
S, MITSUHASHI, B D, DAVIS
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Abstract Quinic dehydrogenase, which catalyzes the conversion of quinic acid to 5-dehydroquinic acid, has been extracted from cells of an Aerobacter mutant and partially purified. The enzyme is DPN-specific. With initial extracts TPN also promotes the reactin, but its activity has been shown to be due to coupling with DPN by pyridine nucleotide ...
S, MITSUHASHI, B D, DAVIS
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Colorimetric assay of shikimic acid against quinic acid
Analytical Biochemistry, 1972Abstract Shikimic acid heated with p-hydroxybenzaldehyde and concentrated sulfuric acid produces an intense and stable purple-violet dye with absorption maximum at 590 nm, and can be quantitatively determined in the range from 15 to over 120 ng (0.1 to 0.7 μmole/ml). Under the same conditions quinic acid produces no color reaction. Shikimic acid can
T, Mossor, R W, Schramm
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[Quinic acid lactone in coffee].
Zeitschrift fur Lebensmittel-Untersuchung und -Forschung, 1985Quinic acid and its lactone (quinide) have been determined in coffee by capillary gas chromatography. No quinide could be detected in 14 green coffee's. After steaming of 4 green coffee's the content of quinic acid was always higher, but no quinide had been formed. During roasting, the latter can be detected when roasting loss exceed 6.5%. It increases
J, Hucke, H G, Maier
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(−)-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
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, 2020
Carbon quantum dots (CQDs) have undergone extensive research and proved to have the potential to act both as drug delivery vehicles and imaging agents.
Shabnam Samimi +2 more
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Carbon quantum dots (CQDs) have undergone extensive research and proved to have the potential to act both as drug delivery vehicles and imaging agents.
Shabnam Samimi +2 more
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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
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Journal of biochemical and molecular toxicology
Ulcerative colitis is a chronic inflammatory disease characterized by oxidative stress and the production of pro‐inflammatory cytokines. Ferulic acid and quinic acid, two phenolic compounds, are thought to have potent antioxidant and anti‐inflammatory ...
Mahsa Ekhtiar +3 more
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Ulcerative colitis is a chronic inflammatory disease characterized by oxidative stress and the production of pro‐inflammatory cytokines. Ferulic acid and quinic acid, two phenolic compounds, are thought to have potent antioxidant and anti‐inflammatory ...
Mahsa Ekhtiar +3 more
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A Concise, Enantioselective Approach to (−)-Quinic Acid
Organic Letters, 2006[reaction: see text] An expedient, enantioselective synthesis of a key precursor to (-)-quinic acid has been achieved from an ephedrine-derived morpholine-dione. The salient features of this approach are a highly diastereoselective conversion of the dione to a dialkenyl morpholinone and a subsequent ring-closing metathesis reaction.
Sunil V, Pansare, Vikrant A, Adsool
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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
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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
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Journal of Experimental Botany, 1953
SUMMARY 1. It is shown by means of filter-paper chromatograms prepared at intervals during the oxidation of quinic acid by hydrogen peroxide that at least six acids appear in the reaction liquid. 2. One of these acids is shown to be citric acid, and the oxidation of citric acid is shown to account for a further two of the acids resulting from the ...
A. C. HULME, W. ARTHINGTON
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SUMMARY 1. It is shown by means of filter-paper chromatograms prepared at intervals during the oxidation of quinic acid by hydrogen peroxide that at least six acids appear in the reaction liquid. 2. One of these acids is shown to be citric acid, and the oxidation of citric acid is shown to account for a further two of the acids resulting from the ...
A. C. HULME, W. ARTHINGTON
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