Journal of Radioanalytical Chemistry

, Volume 65, Issue 1–2, pp 155–161 | Cite as

125I-labelling and pharmacokinetics of protease

  • M. E. Abdullah
  • A. M. Shibl
  • S. A. Said
  • M. Abdulhafeez
Chemistry and Labeling


Protease, an enzyme obtained fromPseudomanas aeruginosa, was radioiodinated using chloramine T method of (125I) iodide oxidation. The labelled product was purified using Sephadex G-50. The radiochemical yield reached 26.36% with a product specific activity 6.25 μCi/mg. Blood level curves, following intravenous injection of the labelled protease into mice, showed a biphasic blood level with a rapid initial declining phase; the characteristic of two-compartment open model. The rate constants K21, K12, and K10 were 0.05044, 0.006236, and 0.008264 min−1 respectively indicating a sharp decline in the serum concentration of the toxin, with a t1/2 of 83.85 min. The organ uptake of radioactivity follows the sequence liver>kidneys>lungs>heart>spleen>thyroid. A correlation between uptake and the incidence of tissue-hemorrhage is discussed.


Saudi Arabia Radiochemical Yield Metabisulphite Sodium Metabisulphite Organ Uptake 
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Copyright information

© Akadémiai Kiadó 1981

Authors and Affiliations

  • M. E. Abdullah
    • 1
  • A. M. Shibl
    • 1
  • S. A. Said
    • 1
  • M. Abdulhafeez
    • 1
  1. 1.Department of Pharmaceutics, College of PharmacyUniversity of RiyadhRiyadh(Saudi Arabia)

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