摘要:
The hyaluronidase, which is a hyaluronic acid-specific endo-B-glucuronidase, having a molecular weight of about 28,500 in non-reduced form, is derived from buffalo leeches (that is, leeches of the sub-family Hirudinariinae, such as the species Hirudinaria manillensis or Poecilobdella granulosa) The hyaluronidase, which cleaves hyaluronic acid, but not chondroitin, chondroitin -4- sulphate, chondroitin -6- sulphate or heparin, is considerably more stable at high temperatures and extremes of pH than known leech hyaluronidase. It has a wide range of uses where breakdown of hyaluronic acid is required; of particular interest is in pharmaceutical or veterinary formulations, either as an active agent or a spreading or percutaneous factor. The hyaluronidase is useful for stimulating flow of physiological fluids in the eye (for example, in the treatment of glaucoma).
摘要:
RNA such as messenger RNA is digested to nucleotide phosphates including AMP or ADP. The ATP or a byproduct of the osphorylation, e.g., pyruvate, is detected. Exemplary enzymes d (with appropriate co-reactants and co-factors) are: (1) polynucleotide phosphorylase, pyruvate kinase and luciferase, or 2) phosphodiesterase (or RNase), myokinase, pyruvate kinase and luciferase. The phosphorylation to ATP (e.g., with pyruvate kinase) is preferably coupled with the previous (reversible) enzymatic step.
摘要:
The presence of beta lactum ring-containing cephalosporins and penicillin is determined in biological liquids such as milk by contacting the test liquid with a beta lactum ring-containing chromogenic compound and penicillinase and measuring after a predetermined time period the colour developed in the test liquid in comparison with a colour standard. Preferably, the colour standard is provided by contacting the same ingredients and concentrations for the same time period, exept that the liquid is free of beta lactum ring-containing cephalosporin and penicillin. The colourimetric test can be carried out within a few minutes (e.g. 3-15) utilizing a chromegenic compound such as nitrocefin, preferably on a solid phase substrate. The penicillinase attacks both the beta lactum ring of the chromogenic compound and any beta lactum ring-containing cephalosporin and/or penicillin present in the test liquid. The generation of colour due to breakage of the chromogenic compound's beta lactum ring is correspondingly reduced as the concentration of the beta lactum ring-containing antibiotic increases in the test liquid. Therefore, the method permits measurement of the concentration of such antibiotic in the test liquid. The method is simple, inexpensive, rapid and effective and can be run on equipment which is readily available in most laboratories.
摘要:
This invention relates to methods for detecting, identifying and quantifying enzymes, for example, human proteolytic enzymes. The method broadly comprises forming an immobilized or insoluble complex comprising enzyme, enzyme inhibitor and enzyme inhibitor-antibody reactive site and then detecting and identifying, preferably quantitatively, one or more enzymes bound to the complex. In a preferrend embodiment, a matrix, e.g. solid or semisolid surface or permeable matrix, has affixed thereto enzyme inhibitor-antibody or an immunologically active (inhibitor binding) fragment of such an antibody. This insoluble enzyme inhibitor interacting matrix is then contacted with biological fluid, e.g. body fluid, to bind one or more predetermined enzyme inhibitor-enzyme complexes, if present in the biological fluid. The bound enzyme is then detected, identified and preferably quantified.
摘要:
57 The determination of a substrate or an activity of an enzyme in a sample containing ammonia by using a reaction system which forms ammonia can be performed by decomposing ammonia in the sample with an ammonia-decomposing reagent system, adding a reagent system necessary for the formation of ammonia from the substrate or the substrate for the enzyme to form ammonia and determining the formed ammonia.
摘要:
Enzymes which are activated by pyridoxal phosphate are assayed in a dry analytical element which includes a high coverage of pyridoxal phosphate. The coverage of pyridoxal phosphate is such that the multiplication product of the coverage and the spreading coefficient of the element results in a reagent mixture concentration of at least about 0.9 mmole per liter when a liquid sample is contacted with the element. This coverage eliminates the need for preincubation of the sample with a solution containing pyridoxal phosphate. The reactions for the determination of the enzymes are initiated by contact of the dry elements with a liquid sample.