A Fluorometric Method for Measuring Leucine Aminopeptidase Activity in Red Blood Cells, Serum, or Tissues
Keyword(s):
Abstract A fluorometric determination of leucine aminopeptidase activity in a biological system is described, which is simpler and more sensitive than colori-metric methods. Serum or tissue homogenate is incubated with L-β-naphthylamide at pH 7.2 and 37°C for 10 min. After incubation, ethanol is added to stop the reaction and protein is precipitated. The fluorescence of j3-naphthylamine in the supernatant fluid is measured. Since β-naphthylamide reduces the intensity of the fluorescence of s-naphthyl-amine, solutions used in preparing the standard s-naphthylamine curve must have the same concentration of L-leucyl-s-naphthylamide present as in the test sample.
1955 ◽
Vol 57
(2)
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pp. 458-474
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1982 ◽
Vol 45
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pp. 139-142
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1974 ◽
Vol 57
(2)
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pp. 368-372
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1977 ◽
Vol 60
(5)
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pp. 1131-1136
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1975 ◽
Vol 21
(12)
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pp. 1783-1787
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1968 ◽
Vol 51
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pp. 1220-1224
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