منابع مشابه
Ascorbic acid and copper in linoleate oxidation. II. Ascorbic acid and copper as oxidation catalysts.
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...
متن کاملAscorbic acid and copper in linoleate oxidation. 11. Ascorbic acid and copper as oxidation catalysts
Both ascorbic acid and copper were strong prooxidants in the oxidation of linoleate in a buffered (pH 7.0) aqueous dispersion at 37OC. Minimum concentrations at which catalytic activity was detected were 1.3 X 10-7 M for coppcr and 1.8 X 10-6 M for ascorbic acid. For concentrations up to lop3 M, the increase in rate of oxidation with increase in concentration of catalyst was greater for ascorbi...
متن کاملPhoto-oxidation of ascorbic acid in leaves.
These studies were planned as an extension of previous work (Mapson, 1961a) on investigations into the possible role of ascorbic acid and its oxidized forms as electron carriers in plant respiration, and the present investigation was also carried out with this object primarily in view. The results to be described in this paper suggest that the ascorbic acid system may function as an electrontra...
متن کاملXcvi. Coupled Oxidation of Ascorbic Acid
WHEN a solution of pyridine-haemochromogen containing ascorbic acid is shaken in air, both substances undergo a coupled oxidation leading to verdohaemochromogen and dehydroascorbic acid [Karrer et al. 1933; Lemberg et al. 1938, 1, 2; cf. also Haurowitz,3 1937]. When haemoglobin and ascorbic acid are incubated in air at pH 7-2 and 380 a slower oxidation takes place giving choleglobin, a bile pig...
متن کاملThe Effect of Metaphosphoric Acid and Some Other Inorganic Acids on the Catalytic Oxidation of Ascorbic Acid”
The instability of ascorbic acid in weakly acid solutions has recently been shown to be due to the copper content of the solutions (1). By strict elimination of copper, solutions of ascorbic acid are stable below pH 7.6. The preparation of copper-free reagents, however, is not very practical and in analytical procedures would not eliminate copper contamination from the materials analyzed. The u...
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ژورنال
عنوان ژورنال: Nature
سال: 1946
ISSN: 0028-0836,1476-4687
DOI: 10.1038/158703b0