Abstract: A method for determining human type III, IV and VI collagen peptides by way of enzyme immunoassay according to the sandwich technique using a monoclonal antibody and a polyclonal antibody each to the human type III, IV or VI collagen peptide, characterized in that the monoclonal antibody to the collagen peptide is used as an antibody to be coated onto a solid phase and/or an antibody to be labeled with an enzyme. Also disclosed is a sandwich technique using two different monoclonal antibodies. This method can be carried out with a smaller amount of samples in a simple manner to obtain a precise result and is thus useful for diagnosis of hepatic diseases.

Abstract: The present invention is directed to a method for detecting hepatic diseases which are associated with fibrosis by determining the level of human prolyl hydroxylase in a serum sample which comprises:(a) contacting a serum sample of a patient suspected of having said hepatic disease associated with fibrosis with a monoclonal antibody specific to the .beta.-subunit of human prolyl hydroxylase to form an antigen antibody complex bound on a solid support;(b) contacting said antigen antibody complex bound on said solid support with an enzyme-labeled monoclonal or enzyme-labeled polyclonal antibody specific to human prolyl hydroxylase to form an antibody antigen enzyme-labeled antibody complex; and(c) measuring the amount of enzyme activity of said bound antibody antigen enzyme-labeled antibody complex to determine the level of human prolyl hydroxylase present in said serum sample.

Abstract: A method for determining human prolyl hydroxylase by radioimmunoassay according to the sandwich method wherein a monoclonal antibody to human prolyl hydroxylase and polyclonal antibody to human prolyl hydroxylase are used, characterized in that a monoclonal antibody to human prolyl hydroxylase is used as at least one of the antibodies which are to be coated on a solid support and to be labeled with a radioactive element. This method is simple and operable with small amounts of samples and gives exact results. Thus, this method is useful for the diagnosis of hepatic diseases. A monoclonal antibody specific to the .beta.-subunit of human prolyl hydroxylase is used to test for the human prolyl hydroxylase.

Abstract: A process for purifying urokinase by contacting a crude urokinase-containing solution with a strongly acidic cation exchanger having sulfonic acid groups and adjusted to the NH.sub.4.sup.+ type to adsorb urokinase on said cation exchanger and then eluting urokinase from said exchanger, characterized in that urea is previously added to the crude urokinase-containing solution in such a rate that the final molar concentration of urea in the solution is 3 to 8 M. This process is capable of providing purified urokinase having substantially constant and high specific activity from a crude urokinase-containing solution with a high recovery regardless of purity of the crude urokinase.

Abstract: A process for purifying urokinase which comprises contacting a crude aqueous solution of urokinase with an ionic pullulan gel and thereafter separating and recovering an aqueous solution of urokinase devoid of harmful impurities.