DNA strand-breaking activity and mutagenicity of 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one (DDMP), a Maillard reaction product of glucose and glycine
摘要:
Aqueous solution of glucose and glycine was heated under reflux for 4 h and extracted with ethyl acetate. Reversed phase HPLC of the extract revealed a new DNA strand-breaking substance, which was purified by repeated HPLC and identified as 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one (DDMP). DDMP induced DNA strand breaking in a dose-and time-dependent manner. It was active to break DNA strands at pH 7.4 and 9.4. Its pyranone skeleton was destroyed at the pH values. DNA strand breaking by DDMP was inhibited by superoxide dismutase, catalase, scavengers for hydroxyl radical, spin trapping agents and metal chelators, and the breaking was enhanced by Fe(III) ion. A mixture of DDMP and a spin trap DMPO gave electron spin resonance signals of a spin adduct DMPO-OH, indicating generation of hydroxyl radical. DDMP was found to be mutagenic to Salmonella typhimurium TA100 without metabolic activation. These results show DDMP generated active oxygen species to cause DNA strand breaking and mutagenesis. (C) 1997 Elsevier Science B.V.
Synthesis of a derivative of 1-deoxy-d-erythro-2,3-hexodiulose and its conversion into nonenzymic browning products
作者:Benjamin E. Fisher、Henry B. Sinclair、James C. Goodwin
DOI:10.1016/0008-6215(83)88110-5
日期:1983.6
hydrolysis of 5 produced 6 , which without isolation was treated with piperidine acetate to yield piperidino-hexose-reductone ( 7 ) and 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one ( 8 ). A third component in the reaction mixture has been tentatively assigned from mass-spectroscopic data the structure 4-hydroxy-2-hydroxymethyl-5-methyl-3(2 H )-furanone ( 9 ).
Analysis of Furanone, Pyranone, and New Heterocyclic Colored Compounds from Sugar−Glycine Model Maillard Systems
作者:Jennifer M. Ames、Richard G. Bailey、John Mann
DOI:10.1021/jf980528b
日期:1999.2.1
experiments, as the related compounds 4-hydroxy-2-(hydroxymethyl)-5-methyl-3(2H)-furanone and 2, 3-dihydro-3,5-dihydroxy-6-methyl-4H-pyranone. The remaining compound from the glucose system and the colorless compound from the xylose system were identified as 5-(hydroxymethyl)furfural and 4-hydroxy-5-methyl-3(2H)-furanone, respectively.
Reactivity of 1-Deoxy-<scp>d</scp>-<i>erythro</i>-hexo-2,3-diulose: A Key Intermediate in the Maillard Chemistry of Hexoses
作者:Michael Voigt、Marcus A. Glomb
DOI:10.1021/jf900459x
日期:2009.6.10
Among the compounds identified were carboxylic acids (glyceric acid and acetic acid) that can be seen as stable Maillard end-products. However, the formation of dicarbonyls (3,4-dihydroxy-2-oxobutanal, 1-hydroxybutane-2,3-dione, and 4-hydroxy-2-oxobutanal) and of hydroxycarbonyls (acetol) was verified presenting unstable, reactive Maillard intermediates. Results confirmed that β-dicarbonyl cleavage
Oxygen-Dependent Fragmentation Reactions during the Degradation of 1-Deoxy-<scp>d</scp>-<i>erythro</i>-hexo-2,3-diulose
作者:Michael Voigt、Mareen Smuda、Christoph Pfahler、Marcus A. Glomb
DOI:10.1021/jf100140h
日期:2010.5.12
With this work, we report on further insights into the chemistry of 1-deoxy-o-erythro-hexo-2,3-diulose (1-deoxyglucosone, 1-DG). This alpha-dicarbonyl plays an important role as a highly reactive intermediate in the Maillard chemistry of hexoses. Degradation of 1-DG in the presence of the amino acid L-alanine led to the formation of several products. Lactic acid and glyceric acid were found to be major degradation products. Their formation was dependent on the presence of oxygen. Therefore, a mechanism is postulated based on oxidation leading to a tricarbonyl intermediate. Carbonyl cleavage of this structure should then give rise to carboxylic acids. This mechanism was supported by the isotope distribution observed during degradation of different (13)C-labeled D-glucose isotopomers. Furthermore, we identified 3,5-dihydroxy-6-methyl-2,3-dihydro-4H-pyran-4-one (gamma-pyranone) to be capable of rehydration forming 1-DG to a minor extent and therefore leading to the same degradation products. The formation of carboxylic acids from gamma-pyranone was also dependent on the presence of oxygen in agreement with the postulated oxidative fragmentation. Finally, we investigated the formation of aldehydes expected as retro-aldol products formed within the degradation of 1-DG. Results seemed to rule out this reaction as an important degradation pathway under the conditions investigated herein.
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