Chemie und biochemie der reduktone und reduktonate

Euler, H.; Eistert, Bernd; Hesse, Gerhard

doi:10.1016/0040-4020(58)80067-8

Cited by 22 publications

(8 citation statements)

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“…The four molecules in the unit cell of AA are related in pairs by pseudo screw axes. While the lactone group is moderately corrugated in AA, the whole ring system of SA, except for C(3) and O(3) atoms, has been [19] and Hvoslef [18], the ascorbate anion may be described as a mesomer among slightly different molecular structures. In accordance with this finding, as in the case of AA [10,13], the following radical species of different g parameters (but, due to conformational changes exhibited by the ascorbate anion, not presenting significant hyperfine interactions) were assumed to be responsible for relatively narrow (1.5 mT) ESR spectrum of gamma irradiated SA.…”

Section: Simulation Calculations and Proposed Tentative Radical Speciesmentioning

confidence: 97%

Kinetics of the radiation-induced radical species in gamma irradiated solid sodium ascorbate

Tuner

Korkmaz

2008

Radiation Effects and Defects in Solids

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In the present work, radicals induced in γ-irradiated solid sodium ascorbate (SA) were studied by electron spin resonance (ESR) spectroscopy. While unirradiated samples presented no ESR signal, irradiated samples were found to present a spectrum of an unresolved doublet with a shoulder at the low-magnetic field side. Structural and kinetic features of the radical species responsible for the experimental ESR spectrum were explored through the variations of the signal intensities associated with spectrum maxima and minima with applied microwave power, sample temperature, and room temperature storage time. Activation energies of the involved species were also determined using the data derived from annealing studies performed at high temperatures. Produced radical species were observed to be relatively stable at room temperature. This gave the opportunity to distinguish irradiated SA or SA containing irradiation products from unirradiated ones even long after irradiation. SA presented also the features of a dosimetric material, which could be used in the estimation of dose range in accidental dosimetry.

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Section: Simulation Calculations and Proposed Tentative Radical Speciesmentioning

confidence: 97%

Kinetics of the radiation-induced radical species in gamma irradiated solid sodium ascorbate

Tuner

Korkmaz

2008

Radiation Effects and Defects in Solids

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“…The third is shifted highfield to 108 ppm, a rather low value for N-substituted olefinic carbons. Considering that the compound is a betaine (Euler and Eistert, 1957;Eistert et al, 1968), this phenomenon can be explained: The carbon atoms C-3 and C-5 differ only with respect to the -methyl group, corresponding to the difference in the chemical shift of 3 ppm. C-4 is rich in electrons due to the mesomeric effect of the enolate.…”

Section: Acknowledgmentmentioning

confidence: 99%

5-Hydroxy-2-methyl-4-(alkylamino)-2H-pyran-3(6H)-one: A New Sugar-Derived Aminoreductone

Knerr¹,

Pischetsrieder²,

Severin³

1994

J. Agric. Food Chem.

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“…This is attributed to the structure of the five-membered ring which includes a lactone and an enediol group (Euler & Eistert, 1957). The latter group is also responsible for the acidity of the compound.…”

Section: Introductionmentioning

confidence: 99%

Structure of the crystalline dimer of dehydro-L-ascorbic acid

Hvoslef¹

1972

Acta Crystallogr Sect B

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The first oxidation product of vitamin C is dehydro-L-ascorbic acid, Cx2HlzO12, which is dimeric in the crystalline state. The molecular and crystal structure has been determined by means of three-dimensional X-ray data and the parameters have been refined to a final R index of 5.6 % for the observed reflexions. The monoclinic unit cell (space group C2) contains two molecules and has the lattice parameters a= 15-728, b= 5"530, c=9.453 A and fl= 130.56 °. The molecule has twofold symmetry and comprises a system of five fused rings; non-planar 7-1actone and furanose rings are attached to a central dioxan ring in the 'twisted boat' conformation. The C-O distances within the rings vary between 1.338 and 1.448 A, while the C-C distances have a mean value of 1.524/~. The external, axially bonded C-OH groups have relatively short C-O distances and contain, in addition to the carbonyl groups, the only oxygen atoms taking part in hydrogen bonding. Each molecule is linked to eight others by one such bond to each of them.

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Chemie und biochemie der reduktone und reduktonate

Cited by 22 publications

References 0 publications

Kinetics of the radiation-induced radical species in gamma irradiated solid sodium ascorbate

Kinetics of the radiation-induced radical species in gamma irradiated solid sodium ascorbate

5-Hydroxy-2-methyl-4-(alkylamino)-2H-pyran-3(6H)-one: A New Sugar-Derived Aminoreductone

Structure of the crystalline dimer of dehydro-L-ascorbic acid

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