title: Spectrophotometric bioassay method for urokinase.
abstract: BACKGROUND
  Urokinase is a potent plasminogen activator. Present Bio assay methods of Urokinase are very tedious. So a new simple spectrophotometric Bio assay method was developed to estimate thrombolytic activity of Urokinase.
  
  
  RESULTS
  This Bio assay is designed for the quantitative in vitro spectrophotometric determination of Urokinase activity by utilizing its thrombolytic activity to carry out the lysis of plasma clots. The initial concentration of the plasma clots was adjusted to 0.2+/-0.01 absorbance and the linear decrease in the absorbance by addition of Urokinase concentration from 200 to 1200 IU/ml at lambda(max) 530 nm was studied. The activity of sample Urokinase can be quantified by comparing the absorbance of sample Urokinase with Urokinase standard Bio assay calibration curve and predicted in IU. The r(2) value of standard calibration curve was found out to be 0.993. The repeatability of the Bio assay was studied by performing the experiment six times with fresh plasma samples and the results showed significant similarity.
  
  
  CONCLUSIONS
  We can conclude that the novel Bio assay method was found to be simple, economical, reproducible and accurate than the present Bio assay methods.
authors.affiliation: Dr. D. Y. Patil Institute of Pharmaceutical Sciences and Research, Pimpri, Pune-18, MS, India. badheravi@rediffmail.com
authors.forename: Ravindra V
authors.initials: RV
authors.lastname: Badhe
authors.forename: Ravindra B
authors.initials: RB
authors.lastname: Chitamani
authors.forename: Mayur N
authors.initials: MN
authors.lastname: Bhujbal
authors.forename: Pradeep S
authors.initials: PS
authors.lastname: Patil
authors.forename: Rabindra K
authors.initials: RK
authors.lastname: Nanda
authors.forename: Satish V
authors.initials: SV
authors.lastname: Shirolkar
authors.forename: Mahesh M
authors.initials: MM
authors.lastname: Ghaisas
authors.forename: Sonali R
authors.initials: SR
authors.lastname: Badhe
mesh_terms: D000818:Animals; D001681:Biological Assay / Q000379:methods*; D006801:Humans; D011817:Rabbits; D012756:Sheep; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D014568:Urokinase-Type Plasminogen Activator / Q000032:analysis / Q000097:blood*
chemical_list: D014568:Urokinase-Type Plasminogen Activator