Results 141 to 150 of about 3,257 (193)
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Journal of Agricultural and Food Chemistry, 2021
To gain comprehensive insight into the interactions of key coffee odorants, like the Strecker aldehydes, acetaldehyde, propanal, methylpropanal, 2- and 3-methylbutanal, and methional, and the nonvolatile fraction of coffee, an untargeted metabolomics approach was applied.
Michael Gigl +2 more
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To gain comprehensive insight into the interactions of key coffee odorants, like the Strecker aldehydes, acetaldehyde, propanal, methylpropanal, 2- and 3-methylbutanal, and methional, and the nonvolatile fraction of coffee, an untargeted metabolomics approach was applied.
Michael Gigl +2 more
exaly +3 more sources
New stereoisomers of quinic acid and their lactones
Liebigs Annalen Der Chemie, 1991AbstractHeating of (−)‐quinic acid [(−)‐1] at reflux temperature with 90% acetic acid/concd. H2SO4 (67/1) yields a mixture of six stereoisomeric quinic acids (four meso forms and two pairs of enantiomers), four γ‐quinides (four pairs of enantiomers), and three δ‐quinides (two meso forms and one enantiomeric pair).
Barbara M Scholz-Böttcher +1 more
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Journal of Agricultural and Food Chemistry, 2016 (−)-Quinic acid possess eight possible stereoisomers, which occur both naturally and as products of thermal food processing. In this contribution, we have selectively synthesized four isomers, namely, epi-quinic acid, muco-quinic acid, cis-quinic acid ...
Sagar Deshpande +2 more
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Phytotherapy Research, 2009 For over 50 years, hippuric/quinic acids were believed to have no biological efficacy. Here data are presented to support the hypothesis that quinic acid is not responsible for any efficacy, but rather that quinic acid nutritionally supports the ...
Harald Lund, Tomáš Leanderson
exaly +3 more sources
Acta Crystallographica Section C Crystal Structure Communications, 1988
Cristallisation dans P2 1 avec affinement jusqu'a 0,029. Le compose a une conformation chaise.
C. Abell +4 more
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Cristallisation dans P2 1 avec affinement jusqu'a 0,029. Le compose a une conformation chaise.
C. Abell +4 more
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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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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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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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Bioavailability and metabolism of chlorogenic acids (acyl‐quinic acids) in humans
Comprehensive Reviews in Food Science and Food Safety, 2020Abstract Acyl‐quinic acids (chlorogenic acids) are produced by many plants, including fruits, vegetables, and herbal remedies, with coffee and maté particularly rich dietary sources. Epidemiological and intervention studies suggest that they can reduce the risk of developing type 2 diabetes and cardiovascular ...
Michael N. Clifford +2 more
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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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