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  • Title: Pyridoxine (pyridoxamine) phosphate oxidase activity in the red cell.
    Author: Clements JE, Anderson BB.
    Journal: Biochim Biophys Acta; 1980 Jun 13; 613(2):401-9. PubMed ID: 7448195.
    Abstract:
    A method has been developed for the measurement of red cell pyridoxine (pyridoxamine) phosphate oxidase activity. The more stable substrate, pyridoxamine phosphate, was incubated with a red cell haemolysate and the product pyridoxal phosphate was measured by Lactobacillus casei microbiological assay. A wide range of oxidase activities was found in control subjects (6-136 ng pyridoxal phosphate/g Hb x 10(-2)). There is a close correlation between the rate of conversion of pyridoxine to pyridoxal phosphate in whole blood and the oxidase activity. There was a marked increase in both after oral riboflavin. These results suggest that the oxidase plays a large part in the regulation of vitamin B-6 metabolism in red cells.
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