Results 151 to 160 of about 2,565 (186)
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Dehydration of Different Ketoses and Aldoses to 5‐Hydroxymethylfurfural
ChemSusChem, 2013Abstract5‐Hydroxymethylfurfural (HMF) is considered an important building block for future bio‐based chemicals. Here, we present an experimental study using different ketoses (fructose, sorbose, tagatose) and aldoses (glucose, mannose, galactose) under aqueous acidic conditions (65 g L−1 substrate, 100–160 °C, 33–300 mM H2SO4) to gain insights into ...
van Putten, Robert-Jan +6 more
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Ketose Oligosaccharides in the Apricot Fruit
Nature, 1954OLIGOSACCHARIDES composed of glucose and fructose units have been detected by various workers recently in extracts of Jerusalem artichoke, wheat flour, barley and agave. A number of oligosaccharides which are hydrolysed by invertase to glucose and fructose have now been found in ripe apricots.
A. S. F. ASH, T. M. REYNOLDS
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Reactions and Uses of Artificial Ketoses
HETEROCYCLES, 2009- Some artificial ketoses having a naturally occurring aldose backbone can be readily prepared by the addition of RLi or RMgX to aldonolactone derivatives. They are expected to be a novel class of carbohydrate reagents for synthesizing valuable compounds.
Takashi Yamanoi, Sho Matsuda
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Theoretical examination of the mechanism of aldose–ketose isomerization
"Protein Engineering, Design and Selection", 1993Two mechanisms for an aldose-ketose isomerization have been examined using high level ab initio and semiempirical molecular orbital methods. The proton transfer pathway via an enediol intermediate is shown to be favored in the absence of a metal ion, while the hydride transfer pathway becomes favored in the presence of a metal ion.
Y J, Zheng, K M, Merz, G K, Farber
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Vibrational Raman optical activity of ketose monosaccharides
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 1995The vibrational Raman optical activity (ROA) spectra of the four ketose sugars d-fructose, l-sorbose, d-tagatose and d-psicose in aqueous solution, which have been measured in backscattering in the range ≈250–1500 cm−1, are reported. These results are combined with those from a previous ROA study of aldose and pentose sugars in an attempt to establish ...
Alasdair F Bell +2 more
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1972
Publisher Summary This chapter describes the molecular and catalytic properties of aldose–ketose isomerases. Aldose–ketose isomerases catalyze the interconversion of isomeric aldo- and keto sugars by causing the migration of carbon-bound hydrogen between carbons 1 and 2.
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Publisher Summary This chapter describes the molecular and catalytic properties of aldose–ketose isomerases. Aldose–ketose isomerases catalyze the interconversion of isomeric aldo- and keto sugars by causing the migration of carbon-bound hydrogen between carbons 1 and 2.
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Synthesis of Ketose-containing Microbial Glycans
2020Molecules that include ketose residues are referred to as ketose-containing glycans. They have been identified in both prokaryotic and eukaryotic organisms where they serve important biological roles. To understand better the biological roles of ketose-containing glycans, chemical synthesis provides a useful tool to access probe molecules.
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Verhalten des Plasma-Cortisols bei diabetischer Ketose
1960Eine gesteigerte Aktivitat der Nebennierenrinde bei diabetischer Ketoacidose ist von mehreren Autoren angenommen worden. McArthur u. Mitarb. sowie Stowers fanden im Harn bei Menschen und Hunden vermehrt frei reduzierende Corticoide. Die Erhohung der Corticoidausscheidung begann bereits bei leichter Acidose und nahm mit der Schwere der Acidose zu.
H. Sauer +2 more
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Ketose induced respiratory inhibition in isolated hepatocytes.
Revista espanola de fisiologia, 1987The addition of 10 mM fructose or 10 mM tagatose to a suspension of hepatocytes caused respiratory inhibition, whereas no change in oxygen uptake was observed following the addition of glucose. However, incubations in the presence of fructose showed a high, aerobic glycolytic activity.
P, Martínez +2 more
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