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  • Journal
    Digital Access AMA Publ Group v. 3-69, 1960-2012.
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    v. 3-65, 1960-2008.
    89
  • Article
    Fukushima T.
    Nihon Yakurigaku Zasshi. 1975 Jul;71(5):457-62.
    Enzymic properties of monoamine oxidase (MAO) in dog serum were studied and the following results were obtained. Some of enzymic properties of MAO in dog serum differed from that of mitochondrial MAO. When dog serum was fractionated by ammonium sulfate, proteins were concentrated in two fractions, such as 25 approximately 33% and 67 approximately 80% of saturated ammonium sulfate fraction, while MAO activity was concentrated in 40 approximately 50% of saturated ammonium sulfate fraction. The reaction rate of MAO in dog serum was found to be proportional to enzyme concentration. The optimum pH of MAO in dog serum was 7.0 which differed from that of MAO in rabbit serum (pH 8.0). Tris-HCl buffer strongly inhibited MAO activity in dog serum. When benzylamine was used as substrate, the highest activity was obtained compared with the other substrate used. The activities with butylamine, amylamine, beta-phenylethylamine and tyramine showed about 30% while tryptamine and serotonin showed 3 approximately 10% compared to that with benzymlamine as substrate. The value of pI50 of catron was about 3 X 10(-6) M and that of harmaline was about 3 X 10(-5) M, but pargyline did not inhibit MAO activity in dog serum at the concentration of 1 X 10(-4) M.
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