Ascorbic Acid Oxidation in Milk by Preformed Hydrogen Peroxide
نویسندگان
چکیده
منابع مشابه
Enhanced oxidative stress by L-ascorbic acid within cells challenged by hydrogen peroxide.
It has been amply documented that L-ascorbic acid added to the medium of a cell culture increases oxidative damage, and this effect of L-ascorbic acid has been ascribed to the generation of reactive oxygen intermediates in the medium during its auto-oxidation. We have here questioned whether such an effect is exerted inside the cell as well, and if so, what its mechanism is. To assess thiol oxi...
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Using ESR we have demonstrated the formation of the ascorbate free radical from sodium ascorbate, methylene blue and light. In oxygen uptake experiments we have observed the production of hydrogen peroxide while spin trapping experiments have revealed the iron catalyzed production of the hydroxyl free radical in this system. The presence of this highly reactive radical suggests that it could be...
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H(2)O(2) levels in mother's milk were measured at different times of postpartum periods after birth as well as after different times of storage at freezing temperature. The luminol H(2)O(2) dependent chemiluminescence at pH= 9.8 technique was used. Maximum levels of H(2)O(2) were found in the first week of the postpartum period (24.992 +/- 0.168 microM). The levels of H(2)O(2) decreased signifi...
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AIMS Our objective was to investigate whether pro-oxidant properties of ascorbic acid (AA) and tetrahydrobiopterin (BH(4)) modulate endothelium-dependent, electrotonically mediated arterial relaxation. METHODS AND RESULTS In studies with rabbit iliac artery (RIA) rings, NO-independent, endothelium-derived hyperpolarizing factor (EDHF)-type relaxations evoked by the sarcoplasmic endoplasmic re...
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Both ascorbic acid and copper were strong prooxidants in the oxidation of linoleate in a buffered (pH 7.0) aqueous dispersion at 37 degrees C. Minimum concentrations at which catalytic activity was detected were 1.3 x 10(-7) m for copper and 1.8 x 10(-6) m for ascorbic acid. For concentrations up to 10(-3) m, the increase in rate of oxidation with increase in concentration of catalyst was great...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1949
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(49)92022-6