منابع مشابه
Photo-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 کاملAscorbic 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 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 کاملStability of ascorbic acid in extracts of iris leaves.
The highest average value for the ascorbic acid content of freshly harvested vegetables in Olliver's (1954) list is 1 9 mg./g. fresh wt. for parsley (Carum petroselinum); in the Handbook of Biological Data (1956) the highest value is 1-36 for turnip greens (Brassica rapa). Morgan (1942) found 2-8 mg./g. in fresh parsley leaves. We have found the average value for several batches of lucerne (Med...
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ژورنال
عنوان ژورنال: Biochemical Journal
سال: 1962
ISSN: 0006-2936
DOI: 10.1042/bj0850360